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How to wire Intermatic ET series timer
These timers can be wired many different ways

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ET1100 Series
ET1105 , ET1115, ET1125
24-hour / 20 and 30 amp models/ 28 set points/ 120-208-240-277Volt

Buy:
ET1125 timer

Resources
All ET1100 series timer models
Manual

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ET1700 Series/ 20 and 30 amp models/ 7-day 28 setpoints/ 120-208-240-277Volt

Buy:
ET1725C timer

Resources
All ET1700 series timer models
Manual
ET8015
ET8000 Series /7-day astronomic or programmable/ 1 or 2 channel/ 120-240-208-277Volt/

Buy:
ET8215 timer

Resources
All ET8000 series timer models
Manual


Select voltageSelect voltage
Some timers have dip switches such as GM40.
Newest timers such as ET9000 automatically detect line voltage

ET104C timer arrives with selector positioned for 240 volts (as illustrated).
Selector position determines voltage for running clock, timer electronics, and magnetic switches.
The wiring terminals are dry and receive no power when power is applied to timer terminals 1 and 2.

To select 120Volt. Lift and move selector from 240V position to 120Volt position, and push selector down.
Select function
Some models offer multiple function
ET70000 and 90000 functions are programmed, and timer can perform multiple functions throughout week
Other ET models, such as ET1125 can be set to perform specific function, but timer must stay in that single function capacity until jumper is moved again.
Default setting is SIM for simultaneous. Both relays turn on-off at same time.
Other functions include IND so that timer is able to control two separate loads, each with separate programming.
ET1125 timer wiring
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2 independent loads IND
Maximum combined load 30 amps.
Control Two 120V-277V loads with Hot and Neutral
Control Two 208-240Volt loads with Hot Line1 and Hot Line2
Wire terminals without jumper from supply voltage to control any voltage with relays.
ET1125 manual

Timer is shipped default 240Volts.

For independent load operation (2 channel operation), move jumper from default SIM (simultaneous) to IND (independent.

Resource:
Color code for wire

ET1125 timer wiring
ET1125 timer wiringET1125 wiring 2 independent loads SIM
Both loads turn ON at same time
et1125 bell ringingET1125 bell ringing SIM
All bells ring at same time
Program timer for Impulse or bell-ringing
Change t104 timer to ET1725Change wiring from T104 mechanical timer to ET1725
ET1125 controls 3-phaseET1125 controls 480Volt load SIM
Use SIM or simultaneous, so both relays turn on-off at same time
Timer shipped default SIM setting
Change timer voltage selector to 277Volt.
ET1125 manual

For 3-phase 480V-277V:
Bring 480 power from 2 legs of 3-phase. One 480V Hot leg connects to terminal 2, with jumper between terminals 2 and 3..
Other 480V Hot leg connects to terminal 5.
Connect System Neutral to terminal 1
Configuration shown can control single-phase 480Volt 3-pole contactor coil, and 3-pole contactor can control any 3-phase load.
277 volt timerET1125 controls 277Volt load SIM
Use SIM or simultaneous, so both relays turn on-off at same time
Timer shipped default SIM setting
Change timer voltage selector to 277Volt.
ET1125 manual
ET7015 7-day timer  
Five-terminal timer wired for 240 Volts

Selectable voltage 120 208 240 277

What do NO NC terminals mean?
NO NC terminals explained
:
NO terminal is Normally Open, this terminal receives power ONLY when timer turns on
NC terminal is Normally Closed, this terminal receives power and is on at all times EXCEPT when timer turns on, and then the NC turns off.

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3-phase timer 277Volt277 Volt timer
277 Volt 3-pole contactor
277V 480V 3 Phase service with system Neutral
Buy:
90 amp 277V coil 3-pole lug terminals
75 amp 277V coil 3-pole lug terminals
30 amp 277V coil 3-pole
How to wire 3-phase timer

ET series timer wiring
3-phase timer wiring
Intermatic GM40
Tork DTU40
GE 15207
Intermatic T104 and T174

Square D 277 Volt contactor at Amazon
ET 170 series manual
7 day programmable
Read manual to set jumpers for selectable voltage
Selectable voltage 120 208 240 277
Wiring
ET173C and ET174C have 6 terminals and wire same as Fig 1 shown above
ET175C has 5 terminals and wires same as Fig 6 shown below
ET270 series manual
7 day programmable
2 independent outlets
120Volt timer
2 channel timer with selectable voltage
Can operate 2 Loads with different schedule for each Load
Maintained or momentary bell-ringing contacts
Wiring
Read manual for specific wiring options
Wiring is similar to diagrams shown here but the 2-channel option complicates summary drawings.
ET1100 series manual
24 hour
14-ON and 14-OFF
Selectable voltage 120 208 240 277
Read manual for PUL and SIM jumper
2-second pulse for mechanically held contactor = PUL
Multiple Load simultaneously = SIM
Independent Loads = IND (ET1125 only)
Wiring
ET1105 has 4 terminals and is wired like Fig shown above
ET1115 has NO and NC terminals and is wired like Fig 6 shown below
ET1125 has 6 terminals and is wired like Fig 1 shown above
ET 8000 series manual
Astronomic dawn-dusk timer is not necessarily best choice for water heater timer
Selectable voltage 120 208 240 277 Wiring
ET8015 has 4 terminals and wire same as ET102 Fig 2 shown above
ET8215 ET has 6 terminals and wire same as Fig 1 shown above

ET8115 has NO NC terminals same as Fig 6 shown below
Many other wiring variations are possible

Intermatic 70815-71615 Manual
24 volt ET70815CR24 and ET71615CR24
Or selectable voltage ET70815CR and ET71615CR.
4 channel ET70615 or 8 channel ET70815.
24-Hour, 7-day, 365-day optional pulse, fixed switch, astronomic, interval, short-duration, timer with 8-year battery, with isolated NO and NC terminals that allow switching any voltage no matter which timer power voltage is selected.
Each channel can have different timing schedule.
Each channel can control any voltage, and voltage can be different for each channel.
Replaceable logic module
Wiring
Read manual for specific wiring options.
Wiring is similar to diagrams shown here but the 2-channel option complicates summary drawings.
ET70815CR ET70815CR24 Intermatic-et71615cr
Other ET timers.
ET series plug-in type timers by UPM
Paragon ET series
Grasslin ET616
Discontinued models
Intermatic ET104C
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ET104C Manual

ET104C discontinued at Amazon
Replace with EH40 240 volt 30 amp
ET104C water heater timerET104C 240volts/ 1 load SPDT
ET104C has selectable voltage that is preset to 240Volts
Selectable voltage 120 208 240 277
Default voltage from factory is 240Volt

Same illustration applies to ET173 and ET174 7-day timers
If your timer has 4 terminals instead of 6, then same wiring applies, use diagram below

ET104 24-hour timer with 4-ON and 4-OFF per day
Buy ET1100 series for 24-hour 14-ON and 14-OFF per day
Intermatic ET104CET104C 240volts/ 1 load SPST

ET104 has 6 terminals, and ET102 has four terminals
ET104C and ET102 have selectable voltage that is preset to 240Volts
Intermatic ET104CET104C-wiring for 120 VoltsET104C 120volts/ 2 loads SPDT
ET104 has 6 terminals
How to wire to control 2 separate 120Volt loads

Factory default voltage is 240
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