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Intermatic

T104

Mechanical Timer

Technical-data-backed reference for the Intermatic T104 24-hour mechanical time switch.

Intermatic T104 Mechanical Time Switch
208-277 VAC
Voltage

Specifications

Connectivity
Circuits2
Operation Mode24-hour mechanical timer
Events12 ON and 12 OFF events per day
Minimum ON/OFF Time1 hour
Manual OverrideYes
Electrical
Voltage208-277 VAC
Frequency60 Hz
Switch TypeDPST
Max Watts3W
Wire Size#14 AWG minimum / #8 AWG maximum
Performance
Load Ratings40 A resistive/heater, inductive, or tungsten incandescent at 120-480 VAC; 16 A electronic ballast LED at 120/277 VAC
Motor Load Ratings2 HP, 24 FLA at 120 VAC; 5 HP, 28 FLA at 240 VAC
Temperature Range-40 F to 130 F
Physical
TypeIndoor Type 1 metal enclosure
Dimensions7.875 in. H x 5.125 in. W x 3.437 in. D
KnockoutsBottom: two combination 1/2-3/4 in.; back: one combination 1/2-3/4 in.
Certifications
cUL ListedYes
CSA CertifiedYes
Warranty
Standard Warranty1-year limited

Pros & Cons

Pros

  • Technical data lists voltage, switch type, event count, load ratings, wire size, enclosure, and dimensions.
  • Supports up to 12 ON/OFF operations per day with one-hour minimum intervals.
  • Manual override and one ON/one OFF tripper are included in the technical data.

Watchouts

  • Current source is a technical data sheet, not a full installation manual.
  • Troubleshooting content should wait until an installation or service manual is available.
  • Confirm actual load type and voltage before using ratings.

Replacement Parts

PartPart NumberDescription
ON/OFF trippers156T1978AMXOne set of ON/OFF trippers for T100, T7000, and WH40 series timers.
Replacement trippers156T1978AExtra/replacement trippers, listed as one ON and two OFF.
208-277 VAC 60 Hz timer motorWG1573-10DMXMotor listed for T102, T104, T106, T172, T174, T176, and WH40.

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