2016
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How to wire Intermatic CA3750      30 amp Z-wave contactor

Plus Z-wave basics to help installation / Plus: How to install and set up CA3750 /

10 year warranty through Intermatic.com 30 amp x 80% = 24 amp safe maximum
25 amp motor load = 3 Hp @ 240Volt = 1.5 Hp @ 120Volt
Range 50' indoor/ 100' outdoor
CA3750  

Interoperable (will operate) with all brands Zwave controllers

Buy Intermatic CA3750 Z-wave contactor/       $ 89.00

120 - 208 - 240 - 277 volt
40 amp
Range 50' indoor, 100' sight line outdoor.
1 or 2 channel operation
SPST or DPST
Plastic outdoor box/ Nema3R
Buy CA3750 from my Amazon affiliate link:
$80 +
CA3750 at Amazon
CA3750 and related products at Amazon
Zwave controllers
GE z-wave contactor

Resources/ manuals
CA3750 Manual
CA3750 sell sheet

In touch brochure
In touch user guide

158CA12789 In Touch users guide

GE z-wave contactor

Buy Intermatic GE Z-wave contactor/       $ 169.00

120 - 208 - 240 - 277 volt
40 amp
Range 50' indoor, 100' sight line outdoor.
Min temperature 4F Max temperature 104F
1 channel operation
DPST

Metal outdoor box/ Nema3R
Buy
GE z-wave contactor

Resource
GE z-wave manual
Intermatic CA3750

NOTE: the white button on face of CA3750 is used to include device into z-wave network. It is also override button.
    NOTE: The following is important if your application requires using both the override button plus zwave switching. The CA3750 is 1 or 2 channel zwave device... it has 2 relays.... CA3750 can be set for 1 channel DPST where both relays switch on-off at same time... and then override button can control both relays. CA3750 can also be set for 2-channel SPST and each relay can switch on-off separatedly using zwave controller... but in this mode, the override button will only operate one of the relays and not both relays.
NOTE:
When CA3750 is set for DPST, then CA3750 is included one time. When CA3750 is set for SPST then CA3750 is included twice... once for each relay.

Vera Controller will communicate with CA3750/ and any other z-wave

Plug vera lite into 120 volt outlet, connect vera to your in-home wifi router, then use cell phone to communicate with vera to control zwave network.

Vera controller / no monthly contract / phone aps available / supports up to 70 devices
Vera includes or 'pairs' with each device, such as CA3750.
General instructions: Charge controller. Then unplug controller and hold in front of each device. Newer devices might have explorer frame which allows Vera to connect without holding Vera in front of the device. CA3750 does not have explorer frame architecture.
Hold vera in front of CA3750 to include or pair into network. Exclude device before inclusion. Do the same for all zwave devices that do not have explorer frame.

Buy from my links:
Vera lite and Mi casa verde

Resources and forum:
Mi casa verde installation sheet
Vera 3 start up sheet
Mi Casa Verde forum
Vera ResourceResource2
Hometroller quick-start guide/ pdf

Interoperable with todays controllers

Intermatic discontinued their early line of zwave products in 2006, including CA3750. They still manufacture high quality 'multiwave' pool controls that are generally designed to work with each other. See multi-wave.
I do not know who makes the CA3750 today. It has typical Intermatic heavy-duty quality, with standard plastic enclosure that allows passage of zwave signal and supports code wiring plus strong screw terminals for solid copper wire.
Since CA3750 is the simplest type of zwave on-off switch, it will work with today's zwave controllers.
Nexia controls Intermatic CA3750

Nexia Z-wave controls Intermatic CA3750

Nexia is subscription service/

Buy:
Nexia Home Bundle at Amazon
Nexia bridge at Amazon

Resource:
Build your own zwave products
You worked hard in school... so invent something useful
Intermatic CA3750

Control water heater or pool pump remotely using phone + vera lite and/or use hand-held controller

Range 50' indoor, 100' outdoor.

Buy:
Vera lite and Mi casa verde
Hometroller Zee at Amazon
Cooper aspire controller
Leviton Vizia controller
GE z-wave controller and wireless keypad
GE zwave
Intermatic intouch at Amazon
More Z-wave remote controls at Amazon

Resources/ handheld controller manuals:
CA5500 manual
45601 manual
HA09 manual
HA07 product manual
158CA12789 In Touch users guide
Z-Wave -Basics-2011/ pdf
Aspire controller manual
GE controller manual
Smarthings Hub
CA3750 can be set to operate as one switch or two switches
Smarthings Hub WiFi
Smarthings Hub advertisement says: "Ethernet-connected Hub plugs directly into your Internet router and supports ZigBee, Z-Wave as well as IP-accessible devices."
CA3750 is simple zwave binary switch, same as a wall switch, except rated for heavy amp loads
Note: fellow emailed with solution to including with Hub... he set voltage jumpers to 120 volt, temporarily wired CA3750 to lamp cord and placed CA3750 in front of Hub. Pressed the inclusion button quickly to communicate with hub, disconnected 120 volt, reset voltage jumpers to 240v and moved his CA3750 outdoors and wired to 240 volt for pool equipment
Buy:
Smarthings Hub at Amazon
Amazon echo/ voice activate Smartthing
Aeon DSA02203

Aeon DSA02203 Z-wave stick /control network using computer

Buy::
Zwave stick
Aeon DSA02203 at Amazon
RFUSB-Pro at Amazon
CA8700 at Amazon
Resource:

Aeon DSA02203 manual .pdf
                   Intermatic mult-wave       
Image of PE653 installed  
               

5 channel contactor

2016/ Intermatic waterproof PE953 is a z-wave controller that is made to work with PE653 5-channel contactor
PE953 controller is NOT a general household zwave controller. It will control 1 zwave device
953 5-channel  'Controls any Zwave' according to specifications, but only 1 device outside the PE953
PE953 works with 1 channel on CA3750, but not 2 channels. So it will control CA3750 when used as DPDT. More lower on page.
Older model 950 does not work with z-wave
PE series is made to work in swimming pool environment, with low voltage compartment for switching off 24 volt swimming pool light, and control pool pump and spa aerator and interface with freeze control etc
Buy:
PE953 Z-wave remote control at Amazon
PE6563 5-channel receiver

Resources:
PE953 remote control manual
PE953 and PE653 + related multiwave pool equipment
Insteon 2477SA1 X10 load controller  
Larger image

Alternative to Z-wave: X10 relay for resistive loads

Relay handles resistive load only:
Water heater, incandescent light bulb... yes
Motor, CFL, LED.... no
2 year warranty/ must use Insteon X10 compatible controller etc
X10 products from different companies generally don't interoperate with each other.
X10 is older, open-source software, possibly less reliable than Z-wave.
Buy: $120
Insteon 240v / 30 amp X10 load controller for resistive loads only
Insteon remote control products at Amazon
ISY home automation devices at Amazon
Resource:
Insteon load controller manual
Water heater timer   

Use Z-wave or X10/ to control gas water heater timer

Does not use CA3750 contactor.
Use any z-wave or X10 module in place of timer located on top of gas water heater timer
Resource:
Remote control for gas water heater
Keychain remote control Resource:
Ordinary 120 Volt household remote controls
Simple operation: Plug into outlet, use for Christmas lights, table lamps etc
20-30-50 foot range
Keychain type, or indoor, outdoor models

Z-wave network basics  /     to help with installation

Devices connected to electric power will act as a repeater. Battery-powered devices do not act as repeaters since they must awake before they can repeat signal.
CA3750 is continually awake, and will act as a repeater. Can support 232 nodes. Data rate 9600 bits per second. Z-wave information packets are small. 3 watt standby, max 7 watt.

All controllers generally find best route to CA3750. If CA3750 is out of range, then controller can use maximum 4 other device nodes to repeat signal until it reaches CA3750.
All Z-wave controllers will re-try signal 3 times if communication fails, then search for 2 alternative routes, and try each new route 3 times... storing successful routes in memory.
If all attempts fail, then controller indicates failure. Add repeater node in view of CA3750.
If communication is successful, controller will indicate success.
Expect z-wave network to feel more sluggish than flipping on a light switch.
Z wave with CA3750
When controller displays CA3750 on-screen, then press white button located on face of CA3750 to include or 'pair' CA3750 into network. Advisable to exclude each device before inclusion. Controller assigns unique Node-id to each device during inclusion.
CA3750 can have 1 Node-id when used as DPST, or 2 unique Node-ids when used as 2xSPST (more lower on page about choosing DPST or SPST option)
Each Node-id is unique so Controller can send signals to that exact node.
If CA3750 falls off network, then it must be excluded and then re-included.

Generally,controllers must be in direct range of device for inclusion. Some controllers have 'explorer frame' that automatically finds valid route to all devices in network for inclusion (assuming route is populated with devices rated for explorer frame).  If product manual does not specify explorer frame, then check firmware at zwavealliance.com for SDK version 6.0 and up, or versions 4.5-4.9.
My copy of CA3750 manual does not mention explorer frame.
CA3750 will interoperate with controllers and devices rated for explorer frame.

Several Z-wave devices will improve communication

a) More devices result in more routes for communication.
Zwave is mesh network. Each device that is powered with electricity (not battery) is a signal repeater. Maximum 232 devices in a network. Not all controllers and devices can support 232 nodes.

Each device has a unique Node id that is assigned by the controller during inclusion.
When controller sends signal to a unique device node, the signal can be passed from one device to the next device to find best route. 
There can be more than one controller, but generally only 1 controller is the master controller.

b) Z-wave devices from different companies will communicate with each other.
Z-wave is designed for home-use products. Each Z-wave product is tested to ensure it will communicate with all Z-wave-compatible controllers and devices. Newer controllers and devices have more capabilities than older Z-wave products. CA3750 will work with any Z-wave network.
c) CA3750 comes with 10 year limited warranty against defects in workmanship
Power must be connected to terminals 1 and 2 before Z-wave communication is possible

Buy:
Z-wave repeater modules
Outdoor plug-in module at Amazon
Z-wave outlets at Amazon
z-wave switches
z-wave lamp modules
Z-wave heavy duty appliance module

Resource
Basic single-pole and 3-way z-wave light switch manual
Appliance module manual
Outdoor module manual
How Z-wave works: Home-id and Node-id   /    include CA3750 into network.
Each Z-wave network requires 1 main controller.
Controllers can be a hand-held controller (portable controller), or wall-mount controller (static controller), or vera lite (static controller) etc. Controllers can be battery-powered or hardwired..
At the factory, controllers are given unique Home-id number.
No two controllers have same Home-id. The Home-id cannot be changed inside the controller.
During inclusion, the controller will assign it's unque Home-id to each device.
//
Each Z-wave network also requires 1 to 232 devices (actors and sensors).
For example the CA3750 is an example device (or actor), while Z-wave wall switch is another device.
During inclusion, each device will be assigned a unique Node id by the controller.
To summarize: During inclusion, the controller will assign its Home-id and a unique Node-id to each device.
##
CA3750 arrives new out of the box without Home-id or Node-id. Therefore CA3750 device is ready to interoperate with any Z-wave controller.
Recommended that each device be excluded before being included.  This is to clear any prior inclusions.
If a device falls off network, it must be excluded and then included again.  Push white button located on face of CA3750 to include or pair with controller.
++
During inclusion, the device automatically sends its node-information-frame to the controller.
The information-frame tells the controller what kind of device and what command classes are supported.
CA3750 requires no further device configuration after inclusion. The controller knows this after receiving the node information frame from CA3750.
While other z-wave devices, such as battery-powered motion detector, can be configured with various parameters such as wake-up interval etc.
Battery operated devices should be configured immediately. When battery-operated device is included, it will stay awake while waiting for configuration... and this can drain battery.
CA3750 is powered by electricity and not battery, so battery drain is not as issue.
^^
After inclusion, controller will communicate with CA3750 without delay since CA3750 is hardwired and has power full time.
Contrast CA3750 with battery-operated device where controller queues message, waiting for battery-operated device to wake up and accept transmission.
Newer battery-operated devices are 'frequently listening devices' that reduce delay to 1 second since they awake very briefly once per second and search for signal from controller.
##
After the controller's Home-id is assigned to a device, then the device will not accept signals from any other controller (unless network has secondary controller or bridge to another network).
This assures that CA3750 cannot be operated through somebody else's controller.
==
Summary: When inclusion is complete, the CA3750 is assigned the same Home-id as the controller, and is assigned a unique Node-id. And controller knows what commands can be sent to CA3750.
CA3750 is a two-channel contactor. CA3750 has 2 relays. Each relay can be operated together or separately. So depending on your set up, CA3750 can be assigned 1 Node-id or 2 Node-ids. More lower on page about setting up CA3750. Read more 1 and 2 channel
Important: When CA3750 is set for DPST, then the controller assigns 1 Node-id..... and the CA3750 is included one time.
Important: When the CA3750 is set for 2xSPST, then the controller assigns 2 different Node-ids, or one Node-id for each relay.... and the CA3750 is included two times.
CA3750 is hardwired, so its Z-wave node is awake all the time. This means CA3750 acts as a signal repeater to extend network to other devices.
CA3750 and Your Privacy
 CA3750 does not broadcast your information. Z-wave information packets are too small. The 100 foot range too limited.
But do manufacturers and sellers track products to your address? Certainly yes, if profit can be made from the information
Certainly your wifi-based controller could send signals to outside parties.
Remember... the purpose of privacy today is to keep your information from being shown to you or your family unless you authorize release of your information to you. Of course your information is available to all other interested parties around the globe, for a price.
The real question is this: How important is all that information if it cannot be updated when you change habits or die?
Are z-wave networks secure? Yes probably/ 2014.
The home or business owner must be in possession of the device and the controller to 'pair' or include each device into network.
If you are in possession of the device and controller, and each device responds only to the unique Home-id of the controller, then nobody else can control your Z-wave network.
Exception: auto-inclusion devices. This feature makes it easy to set up network. For security, this type device can be excluded and then included by the owner.
Exception: large z-wave networks with multiple controllers. While z-wave has limited range, a hand-held controller could disappear, or be operated by unauthorized person.
With subscription Z-wave service, then assume security and privacy are available to others.
Assume Z-wave standard allows manufacturer to record the unique Home-id of your controller. Zwave is constantly evolving, as are methods to profit from your information.
Will your product become obsolete?  CA3750 does not have newest Z-wave architecture. But all Z-wave devices will continue to operate in your network.
Future beyond Z-wave? Google / Thread Group/ Nest/ Yale/ Samsung 'promise a rash of new home automation devices that will interoperate with each other [using wi-fi] and connect to the Internet without the need for a special gateway.' For example vera lite is a gateway that connects to internet so you can control z-wave network with phone etc. 
Buy:
Nest thermostat at Amazon

People ask how about wi-fi home automation? Caution: Wifi poses health risk from high radiation levels, but outcomes from radiation generally do not manifest immediately.
Wifi carries large packets of information: for example a movie. Wifi drains batteries very quickly: for example cell phone battery needs to be recharged frequently.
Contrast wi-fi with a TV remote control... the TV remote batteries last many months since the information packets are small, and the device is asleep except when button is pushed. Radiation levels for TV remote control are very low.
Contrast wi-fi and z-wave...  Z-wave information packets are small for both battery-operated z-wave devices, and for continually-powered z-wave devices.
For example CA3750 is 9700 bits per second. Radiation levels are very small for z-wave.
Choose wi-fi or z-wave? Both systems operate on different wavelength and do not interfere with each other. Both have distance limitations. Both systems can be connected to and controlled by phone or computer. Both systems control electric and electronic devices.
Zwave has advantages. Low radiation. Low amount of information is passed between controller and device, and to possible outside parties.
Zwave is not dependent on a specific brand. Zwave products from any company will interoperate with each other. Zwave devices will not become obsolete in a few years.
Wi-fi is high radiation. Large amounts of information can be passed between controller and device, and possibly to other parties. Broadcast is stronger. Response might be more rapid.
Wi-fi can broadcast security video and record more parameters.
Wi-fi systems are largely brand-specific. And the wi-fi providers usually want to be a partner with your activities.
Your information is worth big money. When wi-fi manufacturer changes software or upgrades system or consolidates into one corporation that owns all wi-fi, you might need to replace devices, or upgrade 'package.' Don't forget the software upgrade for your smart TV that includes advertisements, or the Hi-Def product offered by TV that slowly degraded regular def over several years to differentiate their 'product.' Or Windows 10 upgrade that no longer protects you from spyware... because it is the spyware.
An appliance error code is opportunity to blizzard you with 'ten competitive offers for repair' that come from the same company that operates as ten different companies.
Will CA3750 interoperate with wi-fi
CA3750 is z-wave. CA3750 does not work directly with wi-fi... unless the wi-fi controller says it will interoperate with z-wave.
For example Smarthings Hub is wi-fi that is made to work with z-wave... the advertisement says: "Ethernet-connected Hub plugs directly into your wi-fi Internet router and supports ZigBee, Z-Wave as well as IP-accessible devices."
Smarthings shows long list of zwave products it has tested as compatible. CA3750 is not specifically shown on list, but otther Intermatic switches have been successfully approved. CA3750 is a simple on-off switch and should work fine with Smarthings.
Buy: Smarthings Hub at Amazon
Z-wave Batteries: This information is for battery-operated devices. CA3750 does not use batteries, and is hardwired and fully powered at all times.
How long do z-wave batteries last? As a result of sleeping, battery-operated z-wave remote control, or motion detector, or door-alarm sensor will work for extended time using same batteries. Typical goal is 2-3 year battery life. And 1 year for' frequently listening devices' that awake very briefly once per second.

Battery life calculation: Ordinary AAA battery has 1000mAh (miliamp hours). Z-wave chip consumes .0025 mA during hibernation sleep.; 15-21 mA at wakeup, and 21-36 mA during transmission. If battery-operated z-wave was awake full time, then battery would last 2 days. Math 1000 mAh divided by 21 mA consumption = 47 hours or 2 days. This is why battery-opeated z-wave must sleep except when prompted by push of button, or prompted by parameters set during device configuration.
Chance of running battery down is one reason why battery-operated devices must be configured immediately after inclusion: to set wake-up schedule, among other settings.
CA3750 is hardwired, requires no battery, and requires no device configuration after inclusion is complete, and is awake full time, with 3 watt standby consumption.

How to set up CA3750 / for installation and wiring

1) Select voltage / unit is preset with default 240V

Choose 120-208-240-277 Volt
This will be the voltage connected to terminals 1 and 2
This voltages is needed to operate on-off switching.

Always select correct voltage BEFORE connecting power.

Do not spark-test wire against terminals... will burn out electronic devices and relays etc ... use tester.

Remove CA3750 from plastic indoor-outdoor enclosure (plastic box)
Plastic enclosure does not need to be grounded or bonded to nearby ground rod.
While enclosure does not need grounding, all circuits require ground wire that is bonded to main panel and main box must be grounded to outdoor ground rod for safety and to help supress surge events. Motors must absolutely be grounded. Some outdoor installations, such as solar panels and pool equipmenrt require separate direct bond to nearby ground rod in addition to gound wire to main panel. Wiring diagrams below on this page

1) Select voltage: Locate fused jumper on back of contactor
Default voltage is 240V>  if 240V is your voltage, skip this step
Move fused jumper to select incoming voltage
This is voltage that will power the device and relay switches
120Volt
208Volt
240Volt
277Volt

2) Set contact selector switch

CA3750 contactor has 2 relays> relays are ordinary on-off switch
The relay switches can be operated together at same time (DPST) or independently (SPST)

DPST double-pole-single-throw means both relays turn on-off same time or simultaneously. This gives advantage of being able to turn off both Hot wires in 208-240Volt applications... which is preferred by most electricians, but not required. Read more below about installing safety cut off.

Independent 2xSPST single-pole-single-throw means the relays can turn on-off separately from each other. This has advantage of controlling two separate Loads (light, fan, motor, water heater, etc). In electrician's terms, this mode is called two-channel controller.
2) Look for very tiny switch located on back of contactor, near the jumpers
Choose:
- Simultaneous DPST to operate both relays at same time
-2 independent SPST or 2xSPST to operate each relay with different schedule

Why DPST and 2xSPST?
CA3750 is single phase. All household wiring is single phase, meaning two wires are needed to complete any electric circuit. (+ground)
Contrast single-phase with commercial 3-phase where 3 wires are needed for a circuit. (+ground)
All single-phase circuits require two wires: Single-phase circuits can be turned on-off by switching off 1 wire or 2 wires.
a) With 2xSPST you can control two different circuits by turning off 1 wire in each circuit. For example turn off 240V water heater circuit by turning off 1 wire, and turn off 120V light bulb on a different circuit by turning off 1 wire. This lets you control two different loads with the CA3750, and control 2 different voltages if you choose.
b) With DPST you can control 1 circuit by turning off both wires in the circuit at the same moment. Most electricians prefer turning off both wires when working with 208-240Volt. But it is not required by code.

3) Choose location

Inductive loads such as motors, blowers can intefere with Z-wave. Resistive loads such as light bulbs, heating elements do not intefere with Z-wave. 

Z-wave is a radio wave. Each country has a specific radio frequency or band of the spectrum allocated for z-wave products. America's use a different band than Europe, etc. The band for CA3750 is 908.42 MHz and is relatively free from interferance with other radio signals.
Z-wave does not operate on same band as wi-fi for example.
Locate CA3750 in open area so clear communication can take place with controller.
Or locate CA3750 in clear view of other nodes in the network.
Max 4 nodes between controller and CA3750.
Do not install CA3750 near motor, air conditioner, furnace or other inductive source of interference.
Do not install with metal or aluminum between CA3750 and controller.
Signal will travel through walls and floors. Up to 30% loss for each wall.
Clear sight-line with controller allows 100' distance.
Several walls reduce distance to 30-50 feet. Brick walls reduce distance more than plaster wall.
Z-wave signal is not as strong as in-home wi-fi signal, for example. Adding several nodes to network helps since each node communicates with other nodes in the network.
Z-wave signal travels outward 360 degrees in all directions like a rock making ripples in a pond.
Obstructions and distance weaken the signal.. Metals can stop the signal, making a dead spot.
Sending signal horizontally through several joists or rafters can block the signal.
Furniture & belongings between controller and Z-wave device can block or weaken signal.
Always test network capability before installation.

4) Installation

Attach box to structure, 
Snap CA3750 into Nema 3R indoor-outdoor box.
Operating temperature -4F   +140F
Install enclosure directly to structure using 3-4 screws. Choice of locations. Indoor or outdoor.
To install CA3750 into the enclosure (plastic box): there are tabs on side of CA3750 that slide into slots and then the CA3750 snaps back into thumb-spring located top left.
CA3750 fits any Intermatic enclosure. Choose plastic, not metal.
Nema 1 enclosures are used indoors. CA3750 has Nema 3R plastic enclosure. Nema 3R enclosures are used indoor-or-outdoor, and can be exposed to rain, but are not moisture-proof, and not humidity-proof, and cannot be under water. Install at least 12" above anticipated snowfall.
Do not work on CA3750 unless power is off. Keep enclosure door closed to prevent hazard.
Resources:
See more Intermatic enclosures
Pool control centers

5) Connect power to Terminals 1 and 2 (supply terminals)

Absolutely you must match incoming voltage with incoming-voltage jumpers (shown in step 1) before applying voltage
When power is connected to terminals 1 and 2, this supplies power to operate z-wave receiver, circuit board and both relays.
Use hammer and screwdriver and pliers to remove knockouts to run wire into enclosure. Always use romex connectors to fasten electric cable to enclosure. Electric cables must be tightly secured to CA3750. All cables and conduit must be held tight to structure to preserve installation safety.

6) Input-Output Terminals 3-4 and 5-6 are dry

Terminals  3-4 5-6 are relay terminals. Each relay is on-off switch.
Terminals  3-4 5-6 have no power when power is applied to terminals 1-2.
In electrician terms, terminals 3-4 5-6 are 'dry'
This gives option to control different voltages on each relay
Dry means there is no power on terminals 3-4 5-6 unless wires are connected to those terminals.
Dry terminals allow each relay to handle different voltages or any AC voltage you choose.
CA3750 does not show DC rating, but will probably handle 24Volt DC.
Do not connect DC solar panel wires directly to any timer or AC-rated device. Fire hazard.

7) Terminals 3-4 are electrically separate 

from Terminals 5-6

Terminals 3 and 4 are one relay
Terminals 4 and 5 are separate relay
Relays can be operated at same time DPST
Or each relay can be operated independent from each other 2xSPST
Terminals 3-4 are electrically separate from terminals 5-6 unless a jumper wire is added. A jumper is short piece of wire that is installed to connect terminals together.

How it works: When CA3750 turns ON, then 3 and 4 are turned ON. Electricity flows from terminal 3 to terminal 4, exactly like turning on light switch.  Electricity does not flow from terminal 3 to any other terminal besides terminal 4.
Terminal 5 and 6 are same.

Terminals 3-4 and 5-6 can be operated separately by choosing 2 independent 2xSPST
2xSPST means terminals 3-4 can be switched on-off at different times than terminals 5-6.
DPST means both 3-4 and 5-6 are switched at same moment.
Load = light bulb, motor, fan, heater, pump; Total load = add up all Loads.
Resistive Load: incandescent light bulb, heating element and have uniform voltage and amp draw; Inductive load: motor, pump etc. Inductive loads pull many amps during start up. CA3750 is rated for resitive and inductive.
Load rating... light bulb shows wattage, label on water heater shows volts-watts etc Figure volts amps watts
Volts x amps = watts  Water heater formulas .pdf
Hot wire = wire or wires that carry voltage and would shock you if breaker was on Image residential breaker box
Neutral wire = by code, a white wire used for 120V and 277V circuits to complete circuit, and carries no voltage
Ground wire = green or bare copper wire that connects to ground busbar in breaker box Why ground is needed
208 and 240 volt circuits have 2 Hot wires. (US electric)  Image residential breaker box
Some countries have 230-240Volt circuits with 1 Hot and 1 Neutral (instead of 2 Hot wires). Unknown if CA3750 works with this power source.
120 and 277 volt circuits have 1 Hot and 1 Neutral / Usually 277volt is found in commercial applications (US)
Other voltages include 12V 24V 230V 380V 440V 480V 600V etc found in various applications worldwide
DC direct current generated by solar panels and batteries. Large arc when switching high voltage DC is fire hazard. Device must show DC rating. CA3750 is not rated for DC. Read about DC vrs AC
AC alternating current produced by power plant, windmill, or portable generator. CA3750 is rated for AC More
Single-phase = residential electrical systems are single phase AC, requiring 2 wires to complete circuit More
Three-phase = commercial wiring requiring 3 Hot wires to complete circuit More
Wire gauge = diameter of wire. The wire size and load rating and breaker must match Select wire and breaker
Breaker: circuit breaker will trip when amp draw from Load overheats wire. Turn breaker fully off and then fully on.
60Hz or 60 cycle = number of times AC generator rotates each second. Americas use 60 Hz power, while other countries use 50Hz. CA3750 is rated 50/60 Hz. Read more
Jumper = short wire used to connect 2 electrical points together.

Most residential homes in US use single-phase 120V-240V ... often people call it 110V-220V but rating labels and electric company show 120V-240V. This website uses 120V-240V

Terminology for wiring/ DIY

CA3750 load rating
30 amp resistive/ max 24 amps (30 amps x 80% = 24 amps safe maximum)
120-208-240-277Volt 50-60 Hz
DC or direct current volt ratings are not shown in manual
3Hp at 240Volts/ 1-1/2 Hp at 120V
Volts x amps = watts. 240V x 24 amps = 5760 watts. Use 10 gauge wire
Range 50' indoor, 100' outdoor.
Nema 3R outdoor box/ cannot be under water or continuous wet location

Resource:
How to test if water heater electricity is off

Wiring diagrams start here

CA3750 controls water heater
Larger image

Use push on wire connectors to join wires as needed

Control water heater or pump with CA3750

CA3750 is factory-set for 240Volt operation (read label on side of water heater/ or test voltage to see your voltage... voltage can test 230-244 etc)
Choose DPST so both relays turn on-off at same time.
Z-wave Controller will assign 1 Node id for DPST
Both hot wires are turned on-off by CA3750 contactor
Use 30 amp breaker 10 gauge wire
Maximum 5500 watt residential non-simultaneous water heater
Typical residential water heater is 4500 watt non-simultaneous
Wattage printed on end of each element
If water heater is located outside, then a safety cut off is required, locate near water heater. This will assure safety when working on water heater, and you are certain power is OFF before making repairs etc. More on safety cut off switch lower on this page.

10-3-wire
Wire color can be red-black or white-black or black-black etc
Wire color does not matter.
Add black tape near end of white wire when white wire carries voltage.

Buy:
Intermatic CA3750 at Amazon
Intermatic CA3750 at Amazon

Resources:
Figure volts amps and watts of water heater
How electric water heater works
Select correct wire size
How to check if water heater electricity is OFF
See inside main breaker box
CA3750 off-peak water heater
Two 30 amp breakers required
Larger image

1) Off-peak water heater 

2) simultaneous water heater

3) change water temperatures

4) water heater timer

Set different scenes to utilize all 4 choices

Select 240Volt operation
Choose 2xSPST.
Z-wave Controller must assign 2 different Node ids for 2xSPST.

Control upper and lower parts of tank separately:
Required; ECO-protected thermostat installed in place of lower thermostat
Required: two 30 amp breakers, two 10 gauge wires
Required: rewire tank, & run 2 additional wires to tank

1): Off peak
    Upper thermostat receives power full time
    Top part of tank heats normally
    Turn off power to lower part of tank during peak electric prices
    Water at top of tank stays fully heated, but less hot water is available

2) Simultaneous: this wiring diagram is for simultaneous operation... when both thermostats are ON, water heater recovers faster. Higher first hour delivery: more hot is available during high consumption periods.

3)  Change water heater temperature using 2xSPST.
   Lower thermostat receives power full time
   Set Lower thermostat to regular temperature/ 120F
   Lower element and thermostat heat tank each day
   Set Upper thermostat to higher temperature 140F
   Wash day, upper thermostat receives power, and turns ON
   Top part of tank has very hot water available for washing clothes

4) Use as ordinary timer: Turn off upper and lower parts of tank when on vacation
Buy:
Intermatic CA3750 at Amazon
Intermatic CA3750 at Amazon
Resources:
How to replace thermostat
Family chart for setting water heater timer
How electric water heater works
How to wire water heater thermostats
More off-peak water heater wiring and ideas
How to adjust temperature on gas and electric heaters
Water heater temperature for killing bacteria 140F - options advisories
Ordinary box timers that can accomplish same objectives
Ways to increase amount of hot water
Control gas water heater using Z-wave
CA3750 off peak water heater

Off peak water heater

No wires connect to 5-6

Select 240Volt operation
Choose 2xSPST or DPST
Z-wave Controller must assign 2 different Node ids for 2xSPST.

Control lower part of tank separately.
Upper part of tank runs normally,
When 3-4 is ON, whole tank runs normally.
When 3-4 is off, lower elemnet is off. Saves money during peak electric.

Required; ECO-protected thermostat installed in place of lower thermostat
Required: one 30 amp breaker, 10 gauge wires
Required: rewire tank, & run 1 additional wire to tank

Turn off lower element when electric prices are high. 3-4 OFF
Upper part of tank stays hot
Lower part of tank is off.
Lower part of tank cools over time, or cools when hot water is drawn from tap and cold water enters bottom of water heater
You have hot water for shower or washing hands, but less hot is available.

Buy:
Intermatic CA3750 at Amazon
Intermatic CA3750 at Amazon
Resources:
How to replace thermostat
How to wire water heater thermostats
More off-peak water heater wiring and ideas
How to adjust temperature on gas and electric heaters
Water heater temperature for killing bacteria 140F - options advisories
Ordinary box timers that can accomplish same objectives
Ways to increase amount of hot water
Control gas water heater using Z-wave

Themostats must be covered with insulation or cool  room temperature will cause themostat to misread tank temperature.
Thermostat must sit flat against tank wall to correctly read temperature:
CA3750 off peak water heater

Off peak water heater/ 

And water heater timer

Same as above, except wires connect to 5-6

Select 240Volt operation
Choose 2xSPST.
Z-wave Controller must assign 2 different Node ids for 2xSPST.

Control whole tank or lower part of tank separately:
Lower part of tank is slave to upper part of tank, same as ordinary residential water heater. How electric water heaters work

Required; ECO-protected thermostat installed in place of lower thermostat
Required: one 30 amp breaker, 10 gauge wires
Required: rewire tank, & run 1 additional wire to tank

Normal operation: 3-4 ON; 5-6 ON
Turn water heater off: 5-6 OFF (use as water heater timer)
Off peak: 5-6 ON, 3-4 OFF: (lower is off, upper part operates normally)

Turn off 3-4 so lower element is OFF when electric prices are high.
Upper part of tank stays hot
Lower part of tank is off.
Lower part of tank cools over time, or cools when hot water is drawn from tap and cold water enters bottom of water heater
You have hot water for shower or washing hands, but less hot is available.

Resource:
How to replace thermostat
Themostats must be covered with insulation or cool  room temperature will cause themostat to misread tank temperature.
Thermostat must sit flat against tank wall to correctly read temperature:
CA3750 controls water heater
Larger image

208-240Volt circuit/ 2xSPST or DPST

Control 240V Load by turning off 1 hot wire

10-3-wire
Select Independent 2xSPST or simultaneous DPST
Z-wave Controller assigns 1 Node id for DPST & 2 different Node ids for 2xSPST.
CA3750 turns OFF one hot wire

208-240Volt circuit can be turned ON-OFF by cutting power to one of the two hot wires. Read more
Wire color does not matter.
Up to 5500 watt residential non-simultaneous water heater
Typical residential water heater is 4500 watt non-simultaneous
Wattage printed on end each element
Type of operation (non simultaneous) is on tank label located side of tank

Resources:
Figure volts amps and watts of water heater




______________________
CA3750 Rated for 3 HP at 240Volts
Up to 24 amps
Volts x amps = watts
240Volts x 24 amps = 5760 watts

Resources:
See wire size and loading charts
See motor HP chart
Intermatic CA3750 wiring
Larger image
CA3750 controls 2-speed pump
Larger image
Same wiring applies to 120Volt 2-speed motor or pump, where white neutral wire replaces red wire, and white neutral connects to neutral busbar in breaker box.

CA3750 controls 2-speed pump

Low speed is ON when CA3750 terminals 3-4 are ON.
High speed is ON when CA3750 terminals 3-4 are OFF
High speed and low speed are never ON at same time.
So pump runs full time, either on High or Low speed, unless breaker is OFF... Or choose 2xSPST operation, and you can also turn 2-speed pump completely off, remotely See diagram
Controller assigns 1 Node id for DPST & 2 different Node ids for 2xSPST.
Project materials:
     NO NC Relay
           30Amp DPDT

Buy project materials:
120 volt DPDT relay
240 volt DPDT relay
Intermatic CA3750 at Amazon

Most 2-speed pumps are continuous operation.
Either pump is running at low speed, or at high speed, but never OFF
With CA3750 set to 2xSPST, the black wire powering high speed can be turned ON-OFF separately using terminals 5-6 See diagram
This option means 2-speed pump can be turned OFF entirely
Control 2 speed pump using ordinary T106 Intermatic timer
Control 2-speed and variable speed pump using Zwave control panel
CA3750 control water heater
Larger image

Control 2 water heaters with CA3750

Turn off each Load by turning off 1 hot wire on each circuit

Select 240Volt operation
Choose 2xSPST to operate each water heater with different schedule
Choose DPST to operate both water heaters at same time
Controller assigns 1 Node id for DPST & 2 different Node ids for 2xSPST.

2 separate circuit breakers required.

Up to 5500 watt residential non-simultaneous each water heater can be controlled by 30 amp breaker and 30 amp CA3750
Typical residential water heater is 4500 watt non-simultaneous

Same wiring shows below

single-pole breaker
120 Volt
Push down breaker
Plug-in breakers
Fit residential panels
Buy single-pole:
Siemens 15-60 amp
Single-pole tandem breaker
Resource:
Replace circuit breaker
Not enough space inside breaker box
double-pole breaker
240 Volt
Push down breaker
Plug-in breakers
Fits residential panels
Buy double-pole:
Siemens 15-125 amp
Resource:
See inside main breaker box


Buy indoor/ outdoor subpanel:
120-240 Volt
Subpanels at Amazon
Use up to rated amps

Resource:
How to wire subpanel

Buy:
10-2 gauge/ 30 amp
10-3/ 30 amp

NMB is house wiring
UF is underground
Resource:
Match breaker and wire size

Buy:
12-2 gauge/ 20 amp
12-3/ 20 amp

NMB is house wiring
UF is underground

Buy:
14-2 gauge/ 15 amp
14-3/ 15 amp

NMB is house wiring
UF is underground

Buy
Spools of ground wire
Ground rods at Amazon


clean and straighten wire ends
Insdulation under screw plate
Larger image
Both wires MUST be same gauge
Straighten each wire
Tighten screw very tight against copper wire



Larger image

Connect stranded and solid with wire nconnector and run jumper to screw plate.
Or add solder to stranded wire to make solid.
See example image

Fire safety

Use only solid copper wire, and no insulation under screw plate.

Max 2 wires under screw plate

Both wires same gauge

Do not use stranded wire, it will come loose with heat expansion and overheat and cause burning. Turn stranded wire into solid wire by soldering stranded wire.

Always keep enclosure (box) cover closed

Fire inside timer caused by stranded wire
Keep enclosure door closed at all times
add solder to stranded wire

Fire caused by stranded wire

Do not use stranded wire under screw plate

Add solder to 1" length of tightly twisted stranded wire to make into solid wire
Heat wire. Touch solder to wire. Let cool. File away over-solder.

Prevent fire by installing arc fault breaker

Buy:
soldering guns
Resource

Timer caught fire
How to wire arc fault circuit breaker

Use wire connector    
Push on wire connectors
Use push-on wire connectors

3 wires/ or different gauge wires

Join wires with connector
Run jumper to screw terminal.
Buy:
Push on wire connectors at Amazon
Red 3P connector (shown) for 10-14 gauge wire
Lever nuts for stranded wire at Amazon
Resource:
How to select and install wire connector
10-3-wire
10-3-wire  12 Ga

10 gauge or 12 gauge?

10 gauge is larger/ for 30 amp breaker. 12 gauge is smaller/ for 20 amp breaker
10 gauge wire can have black-white or black-red
12 gauge will have black and white wires

Buy short pieces 10 and 12 gauge wire at local box store
Compare with your wire.
Resource:
Match color code and amp rating for wire
With 120 and 277 Volt circuits, white wire is always Neutral, and black is Hot
Hot wire is always switched on-off. Neutral wire remains connected without switching.
With 208 and 240 circuits, both wires are Hot, and both wires carry voltage.
Either Hot wire can be switched on-off. Or both Hot wires can be switched on-off.
Add black tape when white wire carries voltage (applies to 208 and 240V circuits)
circuit breaker resources

Circuit breaker resources

Water heater is tripping breaker
How to replace circuit breaker
How to wire gfci
Can AC breaker be used for DC breaker
How to reset circuit breaker
Not enough space for circuit breakers/ use tandem
Circuit breakers
How to install subpanel
Why you need ground wire
See inside breaker box
How to wire safety switch
How to wire whole house surge protector
Figure volts amps and watts
Figure correct wire and breaker
Types of surge protection
CA3750
CA3750 has 5 knock-outs
1 on back, 1 on each side and 2 on bottom

Keep enclosure door closed
Romex connector

Use wire connectors, or conduit clamps to secure wire to enclosure

By code, all wire must be securely attached to enclosure to prevent wire pull-out.
Wires or conduit must be secured to structure, so there are no loose wires.
Wires inside the enclosure cannot lay over top of connection terminals.
Join all ground wires together and cover with wire connector.
Push ground wires down and away from connection terminals.
2T2500GA plastic outdoor enclosure has 5 knock outs for 1/2" and 3/4" romex connectors 1 on back, 1 on each side and 2 on bottom
Resource:
More Intermatic enclosures
CA3750 controls pool pump and pool heater
Larger image

CA3750 controls pool pump and pool heater

Control 2 Loads/ choose 2 different schedules

2xSPST means pool pump and pool heater can be controlled separately
Controller assigns 1 Node id for DPST & 2 different Node ids for 2xSPST.

Rated for 3 HP at 240Volts
Up to 24 amps
Volts x amps = watts
240Volts x 24 amps = 5760 watts
Each electrical device has rating label showing voltage and amperage, and sometimes wattage.

Resources:
See wire size and loading charts
See motor HP chart

See ordinary pool timers and manuals
See Intermatic control centers
CA3750 wiring 2-SPST
Larger image

208-240Volt circuit/ 2xSPST

Control 2 different voltage/ 2 different schedules

10-3-wire

2 Independent 2xSPST
Controller assigns 1 Node id for DPST & 2 different Node ids for 2xSPST.
CA3750 can control 2 separate loads with 2xSPST
Loads can be different voltages.
Example shows CA3750 set for 240V, so 240V connects to terminals 1-2
The switching terminals are dry, and receive no voltage when power is applied to terminals 1-2. So terminals 5-6 can control different voltage 120Volt circuit separately. (or at same time if DPST is selected)

208-240Volt circuit can be turned ON-OFF by cutting power to one of the two hot wires.
120Volt circuit is turned ON-OFF by cutting power to hot wire. It is against code to turn 120V circuit on-off by cutting white neutral wire without also cutting power to black hot wire.
CA3750 controls two 120Volt circuits
Larger image

120Volt circuit/ 2 independent 2xSPST

10-3-wire

2 Independent circuits or 2xSPST
Don't forget to set jumper on back of CA3750 for 120 Volt... the CA3750 arrives with default voltage set for 240 Volt
Always set jumper before applying voltage
CA3750 can control 2 separate loads with 2xSPST, each with different schedule

Works with CFL LED Fluorescent / any type load

120Volt circuit/ Off-delay

2 Independent circuits or 2xSPST
Don't forget to set ju

120Volt circuit/ On-delay

2 Independent circuits or 2xSPST
Don't forget to set ju
CA3750 wiring
Larger image

120Volt circuit/ DPST

2 different voltages/ both same schedule

Use astronomic dawn-dusk feature
CA3750 can control 2 separate loads with DPST
CA3750 set to 120Volt
Connect 120Volt Hot and Neutral to terminals 1 and 2
Control 240Volt load separately from terminals 5-6

Buy:
Intermatic CA3750 at Amazon
      Power supply               CA3750   /   AC-DC power supply  /  NO-NC relay 120AC-24VDC coil  / 240V 26 Amp DC-DC power relay

email geno03245w@gmail.com if you want specific wiring illustration
All wiring illustrations are posted to help the next guy with similar project 

Control DC (direct current) using CA3750

Control power supply with CA3750. Power supply makes 24V DC.
Or switch 24V DC using CA3750
Control NO-NC relay with CA3750/ NO-NC relay switches DC-DC relays
Or control heavy-amp DC-DC power relay directly using CA3750
Use heavy amp DC-DC relay to switch solar power
Buy from my affiliate links:
CA3750
Power supply
Magnecraft relay
DC-DC 26 Amp Power relay
DC-DC 200 Amp Power relay
Resource:
Convert AC water heater to DC water heater
CA3750 and DC voltage

Control solar panels using CA3750

General image
CA3750 is not rated for heavy-amp DC, but will control 12-24 Volt DC available from power supply
Many project options: Run 120 volt power to CA3750 and to Power supply
Buy:
CA3750
Power supply
Magnecraft relay
DC-DC 26 Amp Power relay
DC-DC 200 Amp Power relay
Resource:
Convert AC water heater to DC water heater
CA3750 3-way circuit
Larger image
ca3750 3-way
Larger image

3-way circuit for CA3750

Maximum 16 amp/ illustrations apply to 120 Volt AC or 240 Volt AC
If the load exceeds 16 amp, use ST01 timer to activate 30 amp DPST relay
Example shows two wiring options to integrate CA3750 with a 3-way battery-powered timer.
Installing timer on Load side is easier wiring.
Install ST01 timer without programming to act as ordinary 3-way switch
When CA3750 turns ON, then the  timer reverses and Load turns from OFF to ON, or turns from ON to OFF
When you push button on timer, then the timer reverses so Load turns ON-OFF.
This works because when both red and blue wires on timer receive power, then the switch reverses. When only the blue wire receives power through the timer, then the switches reverses back.
Note the black wire shown in illustration must have power full time
Buy:
CA3750
Intermatic ST01c timer at Amazon/ 1 year warranty
Intermatic ST01 timer
Ei600 5-year warranty timer at Amazon
CR2 replacement battery at Amazon

Resource:
How to program and wire ST01 timer
Use ST01 as 24 volt photoeye
Override thermostat with ST01 timer
Load ratings for Intermatic timers/ pdf
Wire freeze control to CA3750 contactor
Larger image

Freeze control: works for 120V-277V

Override CA3750 with freeze control:

Choose DPST setting on CA3750
Controller assigns 1 Node id for DPST & 2 different Node ids for 2xSPST.
When pool pump is off, then pump and pipes can freeze.
When outdoor or vacation home water heater is off, the water can freeze.
Mechanically-operated freeze control thermostat overrides CA3750 circuit and turns Load ON.
Requires purchase
DPST contactor with 240Volt coil
For 120Volt, purchase contactor with 120V coil See 120V wiring
Another option: Substitute DPST switch as override

Buy:
40 amp contactor with 240Volt coil at amazon
120Volt coil At Amazon
178T24 freeze thermostat
Intermatic CA3750 at Amazon

Another option/ Buy: Reassembled freeze control + 240Volt contactor with separate outdoor box:
240Volt Freeze control and contactor in outdoor box

Resources:
Need specific drawing for your application? email at bottom of this page
More contactors/ contractors explained
Reassembled Intermatic Freeze control products and manuals

Mars 2-pole and 3-pole contactors at Amazon
PF1102 freeze control
PT1102/ 240V
Has freeze control + contactor
PT1102 at Amazon
+ Intermatic CA3750
CA3750
  PF1102 240V freeze control  + CA3750

Freeze control + CA3750

Automatically Override when temperature is below freezing
1) Can be installed separately in 2 separate boxes: PT1102 + CA3750

Buy:
Intermatic CA3750 at Amazon
PF1102 freeze control at Amazon

Resources
Wiring diagram
Intermatic Freeze control products and manuals
PF1112 with CA3750 CA3750 installed in control center  
*Z-Wave devices installed in metal junction boxes may suffer a
significant loss of range (approximately 30-90%) since the metal box blocks a large part of the RF signal

CA3750 can fit into any Intermatic enclosure

*Z-Wave devices installed in metal junction boxes may suffer
significant loss of range (approximately 30-90%) since the metal box blocks a large part of the RF signal

Suggest installing CA3750 next to control panel, and running wires between both boxes.
Resources:
Intermatic enclosures
Intermatic control centers and parts and manuals
PE653 upgrade

PE653 / 5-channel Z-wave contactor

Control 5 different circuits: including 2-speed pump, heater, light etc
Use Z-wave control or push buttons
Convert ordinary timer into Z-wave control... use empty box for wiring
Buy:  ^^$270 + $190 / or $370 for all
P953 Z-wave remote control at Amazon
PE653 Z-wave contactor (receiver) at Amazon
PE653RC wireless control & transmitter & enclosure
Resource:
Read about controlling 2-speed pumps and variable speed pumps using PE653 and PE953 Zwave controller

          Intermatic PE650             PE953
                PE153 + PE650                                             PE953
           $260                                $190 

PE153 / 3-channel timer + Z-wave pool heater control (older style replaced by PE653)

Control 3 different circuits: including 2-speed pump, heater, light etc
Use Z-wave to control pool heater.
Buy:   ^^$260 + $190
P953 Z-wave remote control at Amazon
PE153 series 3-channel timer & Z-wave contactor

Resource:
PE553, manual, and wiring
      Wire Intermatic CA3750     Larger image      

240Volt circuit/ 10-3 wire

White wire neutral, Red-Black hot

10-3-wire
Simultaneous DPST
Wire color does not matter
240Volt circuit can have Neutral wire available
Neutral will not connect to CA3750 when voltage is set to 208 240Volt
3-phase z-wave contactor
Larger image

3-phase z-wave contactor 

CA3750 controls 3-phase

Set CA3750 to 2xSPST or DPST
Select 120 Volt
30Amp 2-channel 50-60 Hz z-wave contactor

Neutral to terminal 1, Hot to terminal 2
Jumper wire from terminal 2 to terminal 3
3-pole contactor coil connects to terminal 1 and terminal 4

Usually buildings with 3-phase also have ordinary 120Volt outlets
Code usually requires separate 120Volt breaker box.

However a single pole breaker can be snapped into 3-phase breaker box.
Depending on the 3-phase service voltage:
For 3-phase 208-120, then single pole breaker will give 120V
If service is 277-480, then a single pole breaker will give 277V
If service is 120-240 High leg, the either 120 or 240 are available

Fused disconnect required on 3-phase line and timer in commercial applications
Resource: 3-pole 120Volt coil
Resources for 3-pole contactors
120 208 3-phase wye  
Larger image

3-phase

Resource:
Read about 3-phase electric
3-phase z-wave
Larger image
Use 30 amp fuse

Control 3-phase 277V-480V with CA3750

3-phase z-wave control using CA3750

Set CA3750 to DPST
Select 277 Volt

Connect white neutral to terminal 1
Connect first Hot leg to terminal 2 ... use 30 amp line fuse
Add jumper wire from terminal 2 to terminal 3
Connect other Hot leg to terminal 5 ... use 30 amp line fuse

Connect wires going to 3-pole contactor to terminals 4 and 6
Contactor has 480Volt coil

Or choose contactor with 277V coil.
Difference: Only 277V enters CA3750 and connects to terminals A and B as illustrated. No hot wire connects to terminal 3, contactor wires connect to terminals 1 and 4
Resources:
Read about 3-phase electric
How to wire 3-phase timers
Resources for 3-pole contactors
30 amp safety cut off
Safety switch
Fusable
Fusable pull out
Fusable pull-out
Fuse protection/ trips when heat on line exceeds fuse rating / same as circuit breaker

Pull-out disconnect -or- Non-fusable Safety cut off 

for outdoor installation:

Locate fused cut-off or no-fusable cut-off next to CA3750 or short reach away... within sight of CA3750.
Purpose to protect anyone working on electricity outside ... so person knows power is OFF, and power cannot accidently be turned ON.  Important since most outdoor 240Volt circuits are not GFCI protected.

Instructions:
To be install on wire from breaker box before wires enter CA3750
Incoming wire from breaker box has 2 Hot wires  Connect these 2 wires to top terminals on cut off.
Wire going to CA3750 has 2 Hot wires. Connect these to lower terminals on cut off.
Connect ground wires to ground screw.
Check that screws are very tight against copper wire.
Move safety switch lever up-and-down to turn power on-off.
Residential information: varies by state and locale
Non-fusable safety switch required on outdoor installations, and high-voltage indoor applications such as 90 amp tankless electric water heater where breaker box not in plain sight of equipment.
Fusable vrs non-fusable: Non-fusable means there is no breaker or fuse inside the cut-off box. Non fusable is manually-operated on-off switch for safety.
Fusable means there is a fuse or breaker that trips when detecting high heat. Having more than 1 breaker or fuse on the circuit is ok.
When is fusable cut off required?
1) If incoming wire is not already protected by circuit breaker    -or-
2) if 30 amp CA3750 is being connected to higher amp line, such as 40-60 amp line going to AC unit.
Buy:
Pullout Disconnect at Amazon
Fusable pullout disconnect
2-pole outdoor / 60 amp/ non-fusable safety switch
2-pole indoor / 30 amp/ fusable safety switch
2-pole 60 amp non-fusable safety switch
Resource:
How to wire safety switch
How to wire subpanel
How to change subpanel from 120V to 240V
http://waterheatertimer.org/pdf/Fibaro-FGS211-z-wave-8A-contactor.pdf
http://waterheatertimer.org/pdf/Fibaro-FGS211-z-wave-16A-contactor.pdf
Control 240 volt with z-wave
Larger image

Control 240 volt with z-wave switch

240 Volt Z-wave switch
Requires Neutral wire. Use ground wire as temporary neutral to check connection. Bring white neutral wire from any nearby light switch or outlet box

Resource
See materials list and detailed wiring
Control 120 volt with z-wave
Larger image

Control Heavy amp 120 volt with z-wave switch

240 Volt Z-wave switch
Requires Neutral wire. Use ground wire as temporary neutral to check connection. Bring white neutral wire from any nearby light switch or outlet box

Resource
See materials list and detailed wiring

Control water heater with WeMo

WeMo programming resources are online
No subscription
WeMo plugs into ordinary 120volt outlet
Control WeMo using phone or tablet
 
Buy:
WeMo at Amazon
Square box extension ring
Box cover
Box cover

Resource:
Step by step installation
See illustration of wiring
Aeon Labs Aeotec z-wave energy smart switch

Aeon labs smart switch

Buy:
Smart switch at Amazon
Rsource:
How-to-wire-Aeon-Labs-Aeotec-z-wave-energy-smart-switch.html
Intermatic RC939 controls timer       
Larger image             
        RC939 transmitter                               RC613 receiver                      WH40 or T104 timer                  

Override timer with remote control

Control 240Volt 3500 watt water heater using Intermatic RC 939 remote control and RC615 120Volt receiver
240Volt circuit can be turned off by turning off 1 hot wire
Do not exceed amp rating of RC615, otherwise install RC613RC relay or PT1203M

Buy:
RC939 3-channel radio transmitter at Amazon
RC613 receiver at Amazon

Resources:
Up to 100 feet away
RC939 transmitter manual
Remote receiver manual
Fuseholders
In home remote controls
How to override T101 timer
T100 series timers
Remote control water heater
Larger image

Remote control water heater

Control any amp water heater using RC615 120Volt receiver and RC639 transmitter.
Transmitter turns ON receiver. Receiver closes circuit on contactor. Contactor sends power to any watt water heater.
Illustrated is ordinary 3500 watt- 5500 watt residential non-simultaneous water heater, 30 amp breaker and 10 gauge wire. With 14 gauge wire running to transmitter.

Buy:
RC939 3-channel radio transmitter at Amazon
RC613 receiver at Amazon
See materials list for 6x6 box and contactor
Duane Paulson of home automation manufacturer 2Gig by Linear, and a former utility-industry exec who developed load management programs, said: “Utilities are incentivizing the wrong people. Individuals don’t care about saving $5 or $10 per month, but give those incentives to companies like ADT or AT&T, with their millions of customers, and the money really adds up.” 1
My opinion: The problem with this thinking, is that people don't like big companies forcing them into packages and treating them with indifference, and misleading the public to gain a dollar.
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