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How to wire off-delay timer
How to wire AH3-3 timer
Use only 600 volt wire.
Lamp cord, extension cords are not rated 600 volt.
Use copper wire only. Aluminum wire is fire risk and should be avoided or installed by professional.

30 amp breaker use 10 gauge /
120-240 volt 30 amp outlet can be installed on 30 amp breaker only/ use 10 gauge wire ... cannot be connected to 15-20-40 amp breaker.

Orange/ #10 gauge wire, with ground ... 30 amp capacity. Safe maximum: 30 x 80% = 24 amps.
Buy:
10-2 gauge/ 30 amp
10-3/ 30 amp
Southwire electric tools
Yellow 12 gauge 20 amp
120 volt 20 amp outlet can be installed on 20 amp breaker, but not 15 amp breaker/ use 12 ga wire.
... cannot be connected to 30-40 amp breaker. 1

Yellow/ #12 gauge wire, with ground ... 20 amp capacity. Safe maximum 16 amps.
Buy:
12-2 gauge/ 20 amp
12-3/ 20 amp

NMB is house wiring
UF is underground
Rolls of stranded wire
HOOK UP Wires
White 14 gauge 15 amp
120 volt 15 amp outlet, AFCI, GFCI, timer, switch etc can be installed on 15 or 20 amp breaker. Never connect 15 gauge wire to 20-30-40 amp breaker.

White/ #14 gauge wire,  with ground ... 15 amp capacity. Safe maximum 12 amps.
Buy:
14-2 gauge/ 15 amp
14-3/ 15 amp

NMB is house wiring
UF is underground
50-60 amp breaker use 6 gauge /
240 volt 50 outlet can be installed on 50 amp breaker only
6-2 wire
Buy:
6-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
40-50 amp breaker use 8 gauge /
240 volt 40 amp outlet can be installed on 40 or 50 amp breaker only
6-2 wire
Buy:
8-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
     
Copper ground wire.
Every device, load, metal enclosure etc must be grounded. Ground wire must be continuous throughout installation, never switched on-off, never used as a Neutral wire.
Generally ... use same size as other wire in circuit
Buy:
12 gauge copper ground wire
Ground wire
Green ground wire
Ground pigtails
Ground rods/ ground clamps at Amazon
armored cable
Non metallic flexible cables must carry ground wire, but do not have hazard of short circuit causing injury from shock.

Armored steel cable can be used as a grounded connection, and will protect wires from damage. Metal can be energized from an insulation failure.

All conduit ...metal, plastic ... flexible and rigid ... must be attached to structure, and attached to enclosures, boxes.
Movement, damage and deterioration are major cause of electrical failure.
Buy:
Non-metallic flexible conduit
Power whip
Armored cable
Southwire armored cable cutter
Pull boxes
Southwire armored cable cutter
Electrical tools must be insulated.
Always best to disconnect power, but insulation failure, lack of proper grounding, grounded neutral, lack of GFCI, out-of-code wiring, generator operating without transfer switch, and other problems still pose a risk to anyone working on electric power ... even when breaker is off.

Buy:
Electrician tools kits
KLEIN TOOLS
Tools kits
IRWIN tools
KNIPEX

Telephone cable knife
Low Voltage Mounting Bracket for Telephone
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
HOOK UP Wires

Protect wiring from damage
Use nipper instead of pliers or screwdriver for removing staples (and nails). Do not damage cable or wires inside cable.

-Code says: Cable SHALL BE secured without damage to the outer covering. NEC sec. 336-15
Buy
End cutting nippers at Amazon


Electrically insulated tools
When removing insulation from wire, do NOT score or put cuts on surface of copper wire. Doing so increases resistance and heat on wire and creates possible weak point.
Buy tools:
KLEIN TOOLS
Wire strippers at Amazon
Electric Wire Stripping Machine
Linesman pliers
Utility knife at Amazon
multimeter
Multimeters
Voltage is tested across two separate wires. Ohms or resistance is tested across both ends of same wire. Amperage is tested along one or two points on same wire.
Buy:
Analog multimeter
Multimeters at Amazon
Klein multimeter
Electric testers at Amazon
Clampmeter for testing amp flow on line

GFCI circuit breaker
A GFCI circuit breaker will protect all boxes on circuit.

Circuit must be grounded. Ground wire must be continuous and connected to each piece of equipment.

White wire on circuit breaker must be connected to Neutral busbar inside the breaker panel.

Buy
GFCI circuit breakers
Push down
single-pole breaker
1" wide Push down breaker
Plug-in breaker
Buy single-pole:
Choose from 15 to 60 amp
Eaton CL series
Siemens 15-60 amp

Single-pole tandem breaker
Tandem breakers
Push down
double-pole breaker
2" wide Push down breaker
Plug-in breakers
Buy double-pole:
Choose from 15 to 125 amp
Choose from 15 amp to 200 amp
Eaton CL series circuit breaker
Siemens circuit breaker
Double pole GFCI
AH3 off delay timer
AH3-3 delay timer and base
12-24-120-240 volt off delay timer/ 0-60 minutes
Buy:
120 volt AH3-3 at Amazon
Resources:
How to wire AH3-3 timer
How to wire H3CR timer
ICM102


ICM 102 on-delay timer
0 Hp Must use contactor
24/ 120-240 volt AC
.03-10 minutes
Buy:
ICM 102
Dayton off delay timers

Resource:
Use off delay to control motors
Dayton offv-delay timer
Off-delay timer/ 19-240 volt AC
15-300 seconds

Buy  
Dayton off delay timers

Resource:
How to wire Dayton off delay timer
DH48S twin timer
12-24-120-240 volt digital twin timer
1 second to 99 minutes
Buy
Uxcell DH48S-S twin timer

Resource:
DH48S twin timer manual
Override air conditioner with timer
twin timer
12-24-120-240 volt digital off delay/ twin timer or one shot timer
.01 second to 99.99 hours
Buy:
Twin timers at Amazon
Sestos twin timer
Omron DH48S twin timer
Resource:
How to wire twin timers
How to wire one-shot timers
AH3 off delay timer           
Timer coil voltage 120V AC.
Contacts rated 3 amp at 240 Volt -or- 6 amp at 120 Volt
AH3 off delay timerVolts x amps = watts/ 6 amp x 120 volt =  720 watts
Max 1/4 HP: bath fans are usually 1/6 Hp or 1/3 Hp. Recirculation pumps 1/25 Hp.
1/3 Hp attic fans are probably to large amp draw for this timer to operate long-term.
For long term, keep load amp draw smaller than load rating... or connect timer to contactor
AH3-3 timer
Can be used as relay, ON-delay, OFF delay, or all 3 at same time.
0-60 minute settings are approximate... experiment to fine tune setting.
8-pin base included with 8 screw terminals. Remove timer from base to attach wires.
Recommend tightening screw plates very tight against wire, especially if using stranded wire.
Stranded wire can become solid wire by adding solder.
Solid wire is not fire hazard. Stranded wire is greater fire hazard when under screw plate.
Size: 2-1/2" tall with base included  x 1-5/8" x 2"
120 volt off delay timer/ Contacts rate 120-208-240 Volt
Rated for all loads incandescent (Tungsten), LED, CFL, resistive, inductive etc
Rated 3 amp @ 240 volt -or- 6 amp @ 120 volt/ Up to 1/4 Hp @ 120 Volt
120 volts x 6 amps = 720 watt.
Bath fans are OK at 1/6 Hp/ Attic fans can run 1/3 to 1/2 Hp... suggest use contactor to carry load
Recirculation pumps are 1/25 Hp and delay timer works fine.
Buy from my affiliate links
AH3 timers at Amazon

Resources:
Use off-delay to control recirculation pump
Use off delay to control motors
Fuseholders
Omron H3CR sell sheet and wiring
AH3-3 wiring Off delay/ 120 volt
Off delay means the load turns ON immediately, and then load turns off after delay time expires.

3-way switch is convenient
Any switch position will start the delay
Click switch up starts delay... click switch down starts delay
Load turns off after delay period expires

Why the 3-way switch diagram works... because the switch is ON full time.
When the timer receives power... the load turns ON until delay period expires... but timer is still receiving power. If you temporarily stop power from going to timer, by clicking the 3-way switch to another position, then the timer resets, the light turns ON again until the delay period expires.
Load remains OFF until power is stopped and started again.

If you use single-pole switch... then the switch must be turned off and then back on to restart delay.
If single-pole switch is turned off, then load remains off
AH3 timer wiring Off delay/ 120 volt/ variant
Same result as above... different wiring.
This design lets you run smaller wire to switch... for example 18 gauge lamp cord.
Smaller wire allows easier wiring going to remote switch.
Add line fuse to if you are using smaller wire
Off delay means the load turns ON immediately, and then load turns off after delay time expires.

3-way switch is convenient
Any switch position will start the delay
Click switch up starts delay... click switch down starts delay
Load turns off after delay period expires

If you use single-pole switch... then the switch must be turned off and then back on to restart delay
If switch is turned off, then load remains off

Buy:
Panel mount fuse holders at Amazon
Ceramic fuses at Amazon
e2 fuseholder with platinum plating
ANL fuseholder and fuses

Resources
More about fuseholder
delay timer with push button Off delay/ NC push buttons added to circuit
NC means normally closed... or the power is ON until button is pushed
Compare: doorbell button is NO ... or power is off until button pushed

Add as many NC push buttons as desired for remote operation
As long as each push button is functioning correctly, the circuit works fine.

Why it works...
Power is ON continually at timer.
When power is interrupted, and then restarted, the timer turns load ON and delay period starts.
When delay period expires, the load turns OFF. Power remains On at the timer
When push button is pushed again, the power is temporarily stopped to timer, and the cycle repeats

Buy from my affiliate links:
Normally closed push button switch at Amazon
AH3-3 at Amazon
delay timer wiring Off delay/ 120 volt/ same as variant above
Illustration shows 18 gauge wire going to remote switch
Fuse and fuseholder are used to protect 18 gauge wire from overload.

Why is the fuse required?
Assume 120 Volt Hot that powers circuit is connected to 20 amp breaker.
18 gauge wire is not rated for 20 amp breaker.
Larger 12 gauge wire is used with 20 amp breaker

If a short circuit occurred somewhere along the 18 gauge wire, then the full 20 amps would pour into the small wire. This would cause wire to overheat. Overheated wire will melt and cause fire.
To prevent fire and overheating hazard, add 5-10 amp inline fuse.
The fuse can be installed anywhere along the 18 gauge wire, and will protect full length of wire.

Diagram shows ordinary rocker switch.
Use 3-way switch for easiest installation. Read descriptions above about 3-way switch.
AH3 delay timer wiring with push buttonAH3 off delay timer wiring with push button
No switch is used... only NC push button switches are present
Add a many NC push buttons as desired
Locate push buttons in each bathroom... press button and recirculation pump starts
Hot water immediately circulates toward bathroom
When delay period ends, recirculation pump turns OFF

The power is ON at timer.
When Normally Closed NC button is pushed, the power to timer stops momentarily.
Power resumes as soon as button is released, the timer delay period begins, and load turns ON.
Once delay period expires, light turns OFF. Power is still ON at timer.


Buy from my affiliate links:
Normally closed push button switch at Amazon
AH3-3 at Amazon
Panel mount fuse holders at Amazon
Fuse blocks at Amazon
Ceramic fuses at Amazon

E2 fuseholder with platinum plating
ANL fuses
AH3 delay timer and relayAH3 off delay
Wall fan turns OFF after boiler turns OFF
Use same design to provide air to Heat pump water heater
Additional general purpose relay with NO NC contacts needed.
Choose coil voltage that can be controlled by boiler... for example 24 VAC etc

Boiler turns on.... relay turns ON
Fan turns ON

Boiler turns OFF... relay turns OFF
Delay countdown begins
Fan continues to run
Fan turns OFF when countdown ends

Buy from my affiliate links:
General purpose relay
AH3-3 at Amazon
Through wall fans



AH3 delay timer and relay
Through-wall fan
Larger image
remote control countdown timerRemote control countdown timer
Buy:
120 volt AH3-3 with base at Amazon
6A855 Solid State delay timer at Amazon
11-pin plug-in base at Amazon
Woods 32555 at Amazon
GE remote at Amazon
Wireless remote controls at Amazon
Replacement A23 battery at Amazon

Select recirculation pump
Resources:
How to wire AH3-3 timer
See analog plug-in timers
See remote controls
Water heater recirculation system
Skylink remote control countdown timerSkylink wireless countdown
Remote control countdown timer

Estimate 1/3 Hp
120V 60 Hz/ 10 watt minimum/ 1500 watt
Operate as ON-OFF or Countdown device/ Up to 500 feet
15 minute - 60 minute countdown
Buy:
Wireless wall mount transmitter TB-318 at Amazon
Wireless countdown receiver PA-318 at Amazon
Transmitter and receiver
Resource:
PA-318 manual
ST01 delay timerON Delay
Illustration shows ON delay wiring.
On delay means the load turns ON after delay period expires. Load remains ON until power is off.
Example uses ST01 timer as switch. (Or use Ei600... same timer with 5-year warranty)

ST01 Timer can be set for dusk-dawn. Automatically turns lights ON at night, and off at dusk.
ST01 Timer automatically adjusts for seasonal changes.
ST01 Timer can be adjusted 20 minutes longer or shorter than actual dusk-dawn

However some folks want longer delay before lights turn ON at night
How it works:
ST01 Timer turns ON. AH3 timer receives power. Time delay countdown begins.
After delay period expires, light turns ON, and remains ON until ST01 timer turns OFF
Cycle repeats next time the ST01 timer turns ON.
Buy:
Intermatic ST01 timer<
Ei600 timer at Amazon
CR2 replacement battery at Amazon
Resource:
Intermatic ST01 timer and manual
How to wire and program ST01 timer
On delay means. When power is applied to terminals 2 and 7, the delay countdown begins.
After the delay period expires, then load turns on and remains on as long as terminals 2 and 7 have power
ah3-3 on delay timer
ON Delay
Move single-pole switch to ON position and shop light turns ON
Delay begins
When delay period expires, the buzzer turns ON

Buzzer remains ON, until switch is moved to OFF position

Add delay timer to photoeye circuit
How to wire photoeye so it turns off 4 hours later
Light turns on normally at dusk, then turns off after preset time expires.
Set the twin timer to the exact minute, second or hour.
Delay timer activates when photeye turns ON, and light turns on normally.
When delay period expires, the light turns off, and timer resets to zero,. Timer and light remain OFF until photoeye activates the circuit again next night.

Illustration shows twin timer timer. Also pictured below.
Buy:
Twin timers at Amazon
Sestos twin timer
Omron DH48S twin timer
Resource:
Twin timer manual
Omron twin timer manual
Resource:
How to wire twin and one-shot timers
Inkbird twin timerRepeated ON Delay using digital twin timer
How to wire twin timer has two time periods that turn on-off indefinitely.
Each time period can be same or different.
You set time period for mode A and then set time period for mode B
Time period ranges from .01 to 99.99 seconds/ or .01 to 99.99 hours.
If seconds are chosen for time period A, then time period B must also be seconds.

Suppose you want light to turn on with switch, and want a buzzer to sound 20 minutes later.
Then you want buzzer to turn OFF after 30 seconds.
Then you want buzzer to sound again 20 minutes later... and then turn OFF after 30 seconds.
Set twin timer for hours. Mode A is set for 00.30 and Mode B is set for 00.03
Operation sequence:
Move single-pole switch to ON position and shop light turns ON and remains ON until switch is turned OFF.
First delay begins for 20 minutes. When delay period expires, the buzzer turns ON for 30 seconds.
Second delay ends after 30 seconds and Buzzer turns OFF. First delay period begins again
With a twin timer, the sequence keeps repeating until light switch is turned OFF.
Buy:
Twin timers at Amazon
Twin timer Digital twin timer/ panel mount
PV shows the time left in the count up for Mode B... so there is .78 seconds left before it switches to Mode A
SV shows 2.99 ... which is the set time I choose for Mode B
When 2.99 seconds ends, Mode A set time will display.
Image shows the Inkbird twin timer.

Use this timer to control red nose on Rudolph reindeer. Set Mode A to 30 seconds and Mode B for 2 seconds. Rudolph's nose will blink on and off as long as power is applied to red nose and timer.
Buy:
Twin timers at Amazon

Resource:
How to wire twin and one-shot timers
Use only 600 volt wire.
Lamp cord, extension cords are not rated 600 volt.
Use copper wire only. Aluminum wire is fire risk and should be avoided or installed by professional.

30 amp breaker use 10 gauge /
120-240 volt 30 amp outlet can be installed on 30 amp breaker only/ use 10 gauge wire ... cannot be connected to 15-20-40 amp breaker.

Orange/ #10 gauge wire, with ground ... 30 amp capacity. Safe maximum: 30 x 80% = 24 amps.
Buy:
10-2 gauge/ 30 amp
10-3/ 30 amp
Southwire electric tools
Yellow 12 gauge 20 amp
120 volt 20 amp outlet can be installed on 20 amp breaker, but not 15 amp breaker/ use 12 ga wire.
... cannot be connected to 30-40 amp breaker.

Yellow/ #12 gauge wire, with ground ... 20 amp capacity. Safe maximum 16 amps.
Buy:
12-2 gauge/ 20 amp
12-3/ 20 amp

NMB is house wiring
UF is underground
Rolls of stranded wire
White 14 gauge 15 amp
120 volt 15 amp outlet, AFCI, GFCI, timer, switch etc can be installed on 15 or 20 amp breaker. Never connect 15 gauge wire to 20-30-40 amp breaker.

White/ #14 gauge wire,  with ground ... 15 amp capacity. Safe maximum 12 amps.
Buy:
14-2 gauge/ 15 amp
14-3/ 15 amp

NMB is house wiring
UF is underground
50-60 amp breaker use 6 gauge /
240 volt 50 outlet can be installed on 50 amp breaker only
6-2 wire
Buy:
6-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
40-50 amp breaker use 8 gauge /
240 volt 40 amp outlet can be installed on 40 or 50 amp breaker only
6-2 wire
Buy:
8-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
    
Copper ground wire.
Every device, load, metal enclosure etc must be grounded. Ground wire must be continuous throughout installation, never switched on-off, never used as a Neutral wire.
Generally ... use same size as other wire in circuit
Buy:
12 gauge copper ground wire
Ground wire
Green ground wire
Ground pigtails
Ground rods/ ground clamps at Amazon
armored cable
Armored cable can be used as a grounded connection, and will protect wires from damage. Metal can be energized from an insulation failure.

Non metallic flexible cables must carry ground wire, but does not have hazard of short circuit causing injury from shock.

All conduit ...metal, plastic ... flexible and rigid ... must be attached to structure, and attached to enclosures, boxes.
Movement, damage and deterioration are major cause of electrical failure.
Buy:
Armored cable
Southwire armored cable cutter
Non-metallic flexible conduit
Power whip
Pull boxes
Southwire armored cable cutter
Electrical tools must be insulated.
Always best to disconnect power, but issues of insulation failure, lack of proper grounding, lack of GFCI, out-of-code wiring, generator operating without transfer switch, and other problems pose a risk to anyone working on electric power.

Buy:
Electrician tools kits
Klein tools
Tools kits
stranded wire
12 ga Stranded wire is good for conduit with multiple wires ... but stranded cannot be installed under screw terminals on outlets, switches, timers etc without risk ... of heat causing splayed strands ....that come loose ... and begin to arc. Connect stranded to short piece of solid copper wire, and attach solid to screw terminal. Do not solder residential or commercial wiring.
Buy:
Rolls of stranded wire

Protect wiring from damage
Use nipper instead of pliers or screwdriver for removing staples (and nails). Do not damage cable or wires inside cable.

-Code says: Cable SHALL BE secured without damage to the outer covering. NEC sec. 336-15
Buy
End cutting nippers at Amazon


Electrically insulated tools
When removing insulation from wire, do NOT score or put cuts on surface of copper wire. Doing so increases resistances and heat on wire and creates possible weak point.
Buy tools:
Wire strippers at Amazon
Linesman pliers
Utility knife at Amazon
multimeter
Multimeters
Voltage is tested across two separate wires. Ohms or resistance is tested across both ends of same wire. Amperage is tested along one or two points on same wire.
Buy:
Analog multimeter
Multimeters at Amazon
Klein multimeter
Electric testers at Amazon
Clampmeter for testing amp flow on line

Spring-wound timer will fit into ordinary switch box ... the LY2 relay with base  is about 2-5/8" tall x 2-5/8" long x 7/8" wide ... so spring timer and relay will fit inside a double wide /// deep /// switch box ... measure first.

Buy:
Spring-wound countdown timers
Intermatic FD timer at Amazon
Intermatic timer and replacement knob
SPDT timer that can be used for 3-way
see sell sheet for SPDT model numbers
DPST timer for two loads
see sell sheet for DPST model numbers 
Omron LY2 / Choose 120Volt coil
30 Amp relay
Uxcell relay
Magnecraft w199 relays
Siemens power relays
Schneider W199 relay
NTE open frame relays

Option:
You can use the relay without the base ... so it is smaller ... but you have to connect wires with crimp terminals.
Use blue terminals for 14 ga wire... yellow for 12-10 ga wire.
Buy:
Terminal kit
Blue for 16-14 wire
Yellow for 12-10 wire
Resource:
Terminals
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Electronics

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Hayward pool
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Campbell Hausfeld air powered
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Powerbuilt automotive
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box timers Resource:
Compare box timers
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Control water heater w/ Z-wave
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Intermatic control centers: and parts
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programmable timer Resource:
Programmable timers
Countdown timers
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