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Grey rectangular mechanical time switch with yellow dial and trippers

Intermatic

Intermatic T104-20 24 Hour DPST 208-277V Time Switch

SKU CH-MSQH-95CED

Mechanical time switch controls electric water heaters with daily scheduling from 1 to 23 hours to shift usage into off-peak periods

  • TypeAccessories
  • Regulates electric water heaters automatically
  • Daily operation adjustable from 1 to 23 hours
  • Shifts electricity use to off-peak periods to reduce utility cost
  • Mechanical 24 hour DPST switch rated 208-277V

Mechanical Water Heater Time Switch

The T104-20 is a mechanical time switch designed to regulate electric water heaters. It operates on a 24-hour cycle with a double-pole single-throw configuration rated for 208-277V. Daily run times are adjustable from 1 to 23 hours using trippers. This device helps shift electricity consumption into off-peak periods to lower utility costs.

Replaces manual switching for single heaters

This unit upgrades from manual on-off control by automating the daily schedule for one water heater. The jump is worth it when you want predictable load shifting without digital programming. It is not for installations needing multiple independent circuits, multi-day programming, or remote monitoring capabilities.

Highlights

  • Regulates electric water heaters automatically
  • Daily operation adjustable from 1 to 23 hours
  • Shifts electricity use to off-peak periods to reduce utility cost
  • Mechanical 24 hour DPST switch rated 208-277V

Specifications

BrandIntermatic Inc
TypeAccessories

Questions about this item

What voltage range does the T104-20 time switch support for installation?

The T104-20 operates on a 208-277V supply, so the circuit must be within that range before wiring the device.

How do you set the daily on/off schedule on this mechanical time switch?

Insert the trippers into the 24-hour dial at the desired hours; each tripper can be placed from 1 to 23 hours apart to create the daily schedule.

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