Lighting, ventilation, pumps and heaters on a 208 or 240 V single-phase circuit often just need a simple daily on/off schedule. The Intermatic GMXST-I-240 is a GMX series 24-hour electromechanical time switch with a 208/240 VAC clock motor, a 21 A SPDT switch and 15-minute captive trippers in a UL Type 1 indoor plastic enclosure. A true clock face makes it easy to set.
Why electricians pick it
- 21 A SPDT contacts rated up to 2 HP at 240 VAC for small motors, fans and pumps.
- Captive trippers in 15-minute steps cannot fall out and get lost.
- Manual OFF/AUTO/ON override for service and testing.
- Finger-safe screw terminals accept up to #12 AWG.
- Enclosure has spare room for a field-added contactor on larger loads.
Specifications
| Spec |
Detail |
| Brand |
Intermatic (GMX series) |
| Model |
GMXST-I-240 |
| Clock supply |
208/240 VAC, 60 Hz, synchronous |
| Program |
24-hour, 15-minute captive trippers |
| Switch |
SPDT, 21 A resistive at 120-250 VAC |
| Motor rating |
1 HP at 120 VAC, 2 HP at 240 VAC |
| Tungsten rating |
1,350 W at 240 VAC |
| Enclosure |
UL Type 1 indoor, plastic |
| Dimensions |
10 in H x 6.5 in W x 3.75 in D |
| Operating temperature |
-40 to 85 degrees C |
Pro tip from the counter
This synchronous model has no battery carryover, so the dial stops during a power outage and the schedule drifts by the length of the outage; on loads where timing matters, add a note on the cover to reset the dial after outages or choose Intermatic's quartz battery-backed GMX model instead.
Best for: 208/240 V lighting circuits, exhaust fans and ventilation, circulation pumps, electric heaters, agricultural loads
Ships from Vaughan, ON to anywhere in Canada. Contractors can request trade pricing through a quote or (905) 553-7171.