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Gray steel enclosure outdoor timer with raintight finish

Intermatic

Intermatic T104RD89 40A 277V 4000W Gray Raintight Outdoor Timer

SKU CH-KNZM-5ZR2X

24-hour electromechanical timer with 40 A DPST contacts, 208-277 V AC rating, NEMA 3R steel enclosure, and up to 12 daily on/off cycles

  • Color/FinishGray
  • Color MappingGray
  • TypeLight Switch
  • Electromechanical timer controls outdoor loads for 24-hour cycles
  • 40 A DPST contacts switch up to 4000 W at 277 V AC
  • NEMA 3R steel enclosure with gray enamel resists rain and splashes
  • Minimum one-hour setting and 23-hour maximum cover long run times
  • Includes two trippers; extra trippers available as 2E054

Outdoor Electromechanical Timer

The Intermatic T104RD89 is a 24-hour electromechanical timer rated at 40 A and 208 to 277 V AC. It provides DPST switching for loads up to 4000 W, making it suitable for controlling outdoor lighting or pump circuits. The gray enamel steel enclosure carries a NEMA 3R raintight rating for exterior mounting. It is not intended for installations requiring seven-day programming or astronomic timing.

Thermal and Power Behaviour

The mechanical drive operates continuously on the applied line voltage with no external power supply needed. Contact rating reaches 2 hp at 120 V and 5 hp at 240 V, so motor loads run within the switch’s thermal limits. The steel enclosure dissipates heat passively without audible fan noise during normal operation. No active cooling or standby power draw is specified.

Included Trippers and Extras

Two trippers are supplied in the box to set on and off events across the 24-hour dial. Minimum on-time is 1 hour and maximum is 23 hours, with up to 12 on/off cycles possible per day. Additional trippers are available separately under part number 2E054 for more complex schedules. No day-skipper function or remote accessories are included.

Highlights

  • Electromechanical timer controls outdoor loads for 24-hour cycles
  • 40 A DPST contacts switch up to 4000 W at 277 V AC
  • NEMA 3R steel enclosure with gray enamel resists rain and splashes
  • Minimum one-hour setting and 23-hour maximum cover long run times
  • Includes two trippers; extra trippers available as 2E054

Specifications

BrandINTERMATIC
Color/FinishGray
Color MappingGray
TypeLight Switch

Questions about this item

How do I mount the steel enclosure and wire the 208 to 277V AC supply without violating the NEMA 3R rating?

Mount the gray enamel steel enclosure vertically on a flat surface, use the supplied conduit knockouts for watertight fittings, and connect the two-pole DPST contacts to the 40 A supply; the common error is leaving a knockout open or using non-listed fittings, which breaks the 3R seal.

Which parts will need replacement after extended outdoor exposure?

The two included trippers (part 2E054) are the only consumable items; they can be swapped without tools when the 12 on/off cycles per day wear the tabs, while the motor and contacts are sealed inside the raintight case.

What is the first limit reached when the timer runs a 5 hp load at 240 V continuously?

The 23-hour maximum on-time setting stops the cycle before the 40 A contact rating or the 4000 W nameplate is exceeded, so the daily program duration is the limiting factor.

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