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3 Pole contactors for 3-phase application

3P contactors with single-phase coil
3 phase contactor

3-pole contactors

3-phase contactors

Single-phase coil voltages 24V, 120V, 208-240V, 277V, 480V

Typical contactor rated 90 amps
50 hp 575 V AC 3 phases
50 hp 460 V AC 3 phases
30 hp 230 V AC 3 phases
20 hp 230 V AC 1 phase
7.5 hp 115 V AC 1 phase
Resource:
Typical wiring diagrams
DC contactor
DC circuit breaker

3-pole contactor wired for DC loads

DC direct current is different than AC alternating current.
Both types of electricty move electrons across conductive materials over time
Both are available in variety of voltages
AC electrons reverse direction or cycle with the generator rotation. DC electrons travel one direction from positive to negative.

AC current is a wave that crosses zero volts each time generator rotates 50-60 times per second,. US 60 cycles. Europe Asia 50 cycles.
DC current is a straight line. The voltage does not oscillate like AC. Electrons flow through circuit at same voltage at all times.
When high voltage AC is turned off, the voltage drops to zero frequently.
When AC voltage hits zero, then the arc or spark or heat is easy to extinguish.
Result: AC switchgear like contactors last million repetitions without melting the points
High voltage DC is different. When high voltage DC is turned off, the electrons keep pushing. Voltage never reaches zero.
Result: DC voltage causes arc or spark or heat that is difficult to stop. Basically the electrons keep piling into the contactor.
DC switchgear must be rated for DC voltages, and be capable of extinguishing DC arc.
Illustration shows one method of extinguishing DC arc using 3-pole contactor. The circuit has 3 parallel switches on the positive wire.
With a 4-pole contactor, 3 poles can be used to turn off Positive, and 1 pole to turn off Negative
Add resistor in parallel with inductive winding* helps eliminate arcs. *Inductive winding is motor load
Resources:

Solar contactor/ pdf
DC relays for solar
DC contactor wiring diagrams/ pdf
What is 3-phase electricity
Can AC circuit breaker be used for DC
3-pole contactor
Heavy amp loads: 20-90 amps
L terminals for Line wires from breaker
T terminals for load wires

3-pole contactor
3-pole definite purpose Contactor sizes approximately:
20-40 amp 3" tall x 2.4" wide
50-60 amp 3.75" tall x 2.7 wide
75-90 amp 4.5' tall x 3.5 wide
3-pole contactor
Light amp loads: 8-12 amps/ contact block connection
A1 A2 coil voltage
L terminals for Line wires from breaker
T terminals for load wires
Terminals 13-14 NO / terminals 21-22 NC
Other terminals apply to auxiliary blocks
Resources:
How to wire motor control contactor
Difference between contactor and relay
How to wire 3-phase
DC relays for solar power

Buy 3-pole contactors/ AC ratings

By manufacturer:
3-pole contactors at Amazon

Packard 3-pole contactor
Fasco 3-pole contactor
Mars 2-pole and 3-pole contactors at Amazon
Brah contactors
Market Forge contactor
Schneider contactor at Amazon
Kripal 3-pole contactor/ they email asking which coil voltage
Furnas contactor at Amazon
Siemens 3-pole contactor
Siemens 3RT motor contactor
Eaton 3 pole contactor with contact block connection
Allen-Bradley 3 pole contactor
Migro contactor

By coil voltage and amp rating

3 pole 24Volt coil
40 amp 3-pole 24V coil Packard
50 amp 3-pole 24V coil Mars
60 amp 3-pole 24V coil Packard
75 amp 3-pole 24V coil Mars
75 amp 3-pole 24V coil Norak

90 amp 3-pole 24Volt lug connection Norak

3--pole 24 Volt DC coil
Siemens 3RT10 up to 460 volt 5 Hp with auxiliary contacts


3-pole 120Volt coil
25 amp 3-pole 120V coil Brah
30 amp 120 volt coil Packard
30 amp 3-pole 120V coil Brah
30 amp 120 volt Mars
30 amp 120 coil Eaton
40 amp 120V coil at Amazon / Packard
40 amp 120V coil Furnas
50 amp 120V coil Norak
50 amp 120v coil Mars
60 amp / 3 pole 120 volt coil Furnas
60 amp 3-pole 120Volt coil Packard
60 amp 3-pole 120V coil Mars
75 amp 3-pole 120V coil Norak
75 amp 3-pole 120V coil Mars
75 amp 3-pole Migro
90 amp 3-pole 120 volt coil Square D
90 amp 3-pole 120 volt coil Mars
100 amp 3-pole Migro

3 pole 208-240Volt coil
30 amp 3-pole 240V coil
30 amp 208-240 coil Mars

40 amp 208-240 volt Eaton
40 amp 208-240 Mars

50 amp 208-240 V Mars
75 amp 3-pole 240V coil Norak
70 amp 3-pole 240V coil Mars
90 amp 3-pole 240Volt coil Norak
90 amp 3-pole 208-240Volt coil Mars

100 amp 3-pole Migro
100 amp 3-pole Kripal

3 pole 277volt coil
20 amp 3-pole 277V coil Norak
30 amp 277V coil 3-pole Norak
30 amp 277V coil Mars
40 amp 3-pole 277V coil Norak
40 amp 277V coil Mars
50 amp 3-pole 277V coil Norak
50 amp 3-pole 277V coil Mars
60 amp 3-pole 277v coil Norak
60 amp 277V coil Mars
75 amp 277V coil 3-pole Norak
75 amp 277V coil Mars
90 amp 277V coil 3-pole lug terminals Norak
90 amp 277 V coil Mars

3-pole 380 volt coil
40 amp/ 3 pole + 1 NO 1NC

3 pole 480Volt coil
30 amp 480V coil Mars

40 amp 480V coil at Amazon/ Brah
40 amp 480V coil Noark
40 amp 480V coil Mars
50 amp 480V coil Noark
50 amp 480V coil Mars
60 amp 480V coil Noark
60 amp 480V coil Mars
75 amp 480V coil Noark at Amazon
75 amp 480V coil Mars
90 amp 480V coil Noark at Amazon
90 amp 480V coil Mars
100 amp 480V coil Kripal/ Yagi

Manuals

 
Mars contactor .pdf
Mars-Furnas contactor .pdf
Eaton contactor .pdf
Eaton contactor .pdf
Eaton .pdf
Schneider contactor
Contactor dimensions
Fasco / pdf
Furnas / pdf
Switch at cross zero

4 pole contactors

Buy

4 pole contactors

Eaton 4 pole contactor
Siemens 4-pole contactor
Mars 4-pole contactor
Schneider 4-pole contactor
Kripal contactor
Larger image
Kripal cvontactor
Larger image

Kripal contactor

Factory-installed auxiliary contacts with 2 NO and 2 NC
Snap onto sides of contactor
Auxiliary contacts activate when contactor turns on-off
Kripal contactors are relatively inexpensive and very versatile
Available in all amperages, with interchangeable coils
Din rail or surface mount

Buy:
Kripal 3-pole contactor/ they email asking which coil voltage
Auxiliary contacts
Kripal auxiliary contact

Auxiliary contacts or auxiliary switch: side-mount/ factory-installed or separate option

Most snap on without tools, or might require small screwdriver
Most auxiliary contacts have 1 NO and 1 NC
Kripal auxiliary contacts are factory-installed. Snap off with small screwdriver.
Push center contact block connection fully down to re-install

Buy:
Kripal 3-pole contactor/ they email asking which coil voltage
Square D Auxiliary contacts
Schneider Auxiliary contactor
Eaton Auxiliary contacts
Siemens auxiliary contact
Siemens Auxiliary contactor
Mars Auxiliary contactor
Noark auxiliary contact
Furnas Auxiliary contactor
      contact block

Contact blocks/ pneumatic timer attachments.

Activated by mechanical action of contactor, instead of electric current.
On delay timers delay start time./
Once the timer block activates, the countdown begins.
When countdown ends, the timer's internal relay activates.
Adding timer block, allows the contactor to control additional circuit with time delay.

Buy Contact blocks at Amazon
Delay contact block at Amazon
Unicell contact block
Dayton contact block

Resource:
How to wire contactor block

3 phase contactor and load

Timer for 3-phase Load

How to wire 3-phase timer
3-phase motor wiring
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3 phase circuit
Larger image

Example 3 phase switch/timer circuit

Wire colors vary
3-phase breaker located in panel
3-phase 3-wire goes to contactor (or motor starter) and then to motor.
Grounding indicated, but ground wire not shown
No neutral wire shown, and not needed for example motor circuit
2 Hot wires pulled from 3-phase go to double-pole switch or timer.
Switch or timer activates motor starter or contactor, which starts motor.

Fused disconnected added between breaker and starter and motor, and is located at motor.
Required by code to protect anyone servicing motor and to protect wires and motor from overheat..
Fused disconnect added between 3-phase and double-pole switch or timer.
Required by code to protect anyone working on circuit, and to protect wires, switch and contactor

Buy:
3-pole contactors at Amazon
3-pole disconnect at Amazon
Leviton MS302-DS 600Volt 30 amp double-pole motor switch at Amazon

Resource:
How to wire 3-phase timer
3-phase motor starter wiring/ pdf
3-phase service panel
Larger image

Example 3 phase panel

3-phase service panel
Larger image
Another image
Neutral and Ground wires not shown
Neutral wire enters with other three wires, and connects to busbar on left side of panel
Neutral wires inside building connect to neutral busbar.
Ground wires connect to busbar on right

Example 3 phase breaker panel

Generally 3 hot wires from meter attach to 3-pole main breaker
Neutral connects to Neutral busbar
Ground wire (not shown) connects to ground busbar.
Some services do not have Neutral wire, and neutral busbar might be used for grounding.

If both busbars on either side of hot busbars are used for Neutrals, Then separate ground busbar is added inside panel.


3-pole breakers fit over each 3 Hot busbars

There are 3 hot busbars in 3-phase panel.
Each hot wire supplies power to separate busbar
Illustration shows where 3-pole breaker snaps into place

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


Multimeter

Test for breaks in wire/ Test for voltage
Most appliance require 80% rated voltage to function correctly
Buy:
Multimeters at Amazon
Electric testers at Amazon 
Resource:
How to test and replace element
How to test thermocouple
Element tests for 120 volts
How to test wire
Safety when testing wires:
Never touch wet or previously flooded appliance.
Never stand on wet surface when working on electric.
Never stand on bare soil, put down dry boards.
Tape tester leads to wood sticks to keep hands away from power.
Use non-contact voltage tester before touching wires.
Never touch or lean into any made of metal.
Remove metal objects from pockets.
Do not use oxygen or fuel accelerants in same room as electrcial repairs

Resource:
Basic house wiring

Non-contact voltage tester

Test for power without touching connectorss
NEVER assume power is OFF
Buy:

Non-contact voltage tester Amazon
Electric testers at Amazon
 
Resource:
How to test electric power is off

Resource:
How to install terminals
Treminals

Terminals

Buy:
Terminal kit
Blue for 16-14 wire
Yellow for 12-10 wire
Read about terminals
wire connector assortment

Twist-on wire connector assortments

Do not reuse old connectors 
Buy

Connector assortment at Amazon
Connector assortment at Amazon

Resource
How to select and install twist-on wire connectors
Weatherproof wire connector

Weatherproof wire connector

Connector cavity is full of silicone
Built-in cover keeps silicone in place
Protect from water, dust etc
Buy from my affiliate links
Weatherproof size 14 to 6 Amazon
Weatherproof size 22 to 8 Amazon

Resource
How to select and install twist-on wire connectors
Wire connector wrench

Wrench to apply wire connectors

Tighten connector 
Buy

Wire connector blaster
Twist connector wrenches at Amazon

Resources:
How to twist wire
How to select and install twist-on wire connectors
Push on wire connectors

Push-on wire connectors in place of twist-on connectors

Buy:
Push on wire connectors Amazon
Red 3P connector for 10-14 gauge wire
Lever connectors for stranded wire at Amazon
add solder to stranded wire

Turn stranded wire into solid wire

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.
Buy:
soldering guns
Resource

Timer caught fire

linesman pliers
Buy tools:
Wire strippers at Amazon
Linesman pliers
Utility knife at Amazon
End cutting nippers at Amazon

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

Fire caused by stranded wire

Do not use stranded wire under screw plate

Applies to timers, switches, outlets, pumps etc.
Small devices, with small loads, such as lamp socket, stranded wire is fine
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.
Buy:
soldering guns
Resource

Timer caught fire


Orange/ #10 gauge for for 30 amp circuits including water heater
with ground
Buy:
10-2 gauge/ 30 amp
10-3/ 30 amp

NMB is house wiring
UF is underground

Yellow 12 gauge 20 amp


Yellow/ #12 gauge wire for 20 amp
with ground
Buy:
12-2 gauge/ 20 amp
12-3/ 20 amp

Rolls of stranded wire

NMB is house wiring
UF is underground
White 14 gauge 15 amp


White/ #14 gauge wire for 15 amp
with ground
Buy:
14-2 gauge/ 15 amp
14-3/ 15 amp

NMB is house wiring
UF is underground

Copper ground wire
Use same size as other wire in circuit

Buy
Spools of ground wire
Ground rods at Amazon

Basic household wiring
Basic water heater circuit

Figure volts amps watts for electric water heater
Test elements
Replace elements
How to wire tankless electric
How to change water heater temperature using timer
Change water heater from 240Volt to 120Volt
Replace thermostats
How to wire thermostats
How to wire water heater for off peak operation

How to twist wire
How to wire Cooper 277 pilot light switch
How to wire combo switch-outlet
How to replace 3-speed fan switch
 

How to wire dimmer
How to wire 3-way dimmer
How to wire occupancy switch
How to wire motion detector
How to wire TM811 and TM8111 switches
How to wire wall timers
How to wire box timers
How to wire off-delay timer
Wire off-delay timer
How to wire pin timers

How to wire and troubleshoot photo eyes
Reverse photoeye so it turns on in day
24 Volt photoeye
24 volt programmable timer

How to wire switches
How to add switch
How to add 3-way switch


Timer for 3-way switch
Timer for 4-way switch

How to add outlet 
How to wire 3-way switches
How to wire 4-way switches


Troubleshoot Malibu outdoor lights
Terminals 
Select and install wire connectors
Select wire size

Electrical formulas
Electricians forum
 

Electrical pages


How to wire arc fault breaker
How to wire GFCI
How to wire GFCI combo

Basic water heater circuit
How to wire water heater for 120Volt
Install old work box

How to drop wire from attic
Wire connector

How to wire 240volt outlets
How to install 3-phase timer
How to wire 3-phase outlets
How to wire 3-phase surge protector
What is 3-phase

How to wire whole house surge protector
How to wire under-counter water heater
 

See inside main breaker box
Replace breaker
Install subpanel

Fuseholder
Contactors
How to solder wires
Whole house surge protector
3-phase surge protection
Circuit breakers

Difference between 120 volt and 240 Volt
Difference between 50Hz and 60Hz
How to install electric meter on water heater
How to wire water heater thermostat
How to wire water heater with switches and timers

6x6x4 Enclosures
Intermatic timer enclosures

Convert AC water heater to DC
How to wire DC solar water heater
DC relays for solar water heater
How to add another thermostat to water heater

How many Kwh to heat water
Chart for figuring heating time for electric heater

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Resources:
How to install gas water heater
How to install electric water heater
Troubleshoot gas water heater
Troubleshoot electric water heater
Point of use water heaters
Resources:
Troubleshoot Gas valves with manuals
Icon gas valve

Install and troubleshoot garbage disposal Waste King disposal
Install point of use water heater

How to wire tankless electric
Point of use water heater

Anode rods anode rods
Recirculation system

Tankless recirculation
Point of use water heater
Type 1 and type 2 surge protection surge protection
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programmable timer Resource:
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Resource:
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