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Snap-Acting Thermostats
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Also known as snap discs, these thermostats switch on cooling systems or switch off heating systems when equipment gets too hot. Each thermostat has five temperature options for switch activation; choose the one that best suits your application.
Unlike heat-actuated switches, these thermostats reset automatically, saving you the effort of replacing a melted fusible link. To calculate their reset temperature, subtract their differential temperature from the temperature you set them at. For example, a thermostat set at 100° F with a 20° F differential will reset at 80° F.
Close Switch at Temperature Setting—Normally closed thermostats are also known as high-limit thermostats—they turn off at a set temperature. They’re often used with electric water heaters, stoves, and furnaces.
Open Switch at Temperature Setting—Normally open thermostats are also known as low-limit thermostats—they turn on at a set temperature. They’re good for use with fans and blowers.
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Temp. Setting, ° F | Max. Temp. Differential, ° F | Switch Designation | Switch Starting Position | Voltage, V AC | Current, amp | Wire Connection | Terminal Size | Face Dia. | Ht. | Wd. | Dp. | Hole Diameter (No. of) | Mounting Fasteners Included | Each | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Close Switch at Temperature Setting | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 90, 100, 110, 120, 130 | 20 | SPST | 1 Off | 120, 240 | 25 | Quick-Disconnect Terminal | 1/4" | 3/4" | 1 3/4" | 2" | 1 3/8" | 3/16" (2) | No | 0000000 | 000000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 140, 150, 160, 170, 180 | 20 | SPST | 1 Off | 120, 240 | 25 | Quick-Disconnect Terminal | 1/4" | 3/4" | 1 3/4" | 2" | 1 3/8" | 3/16" (2) | No | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Open Switch at Temperature Setting | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 135, 145, 155, 165, 175 | 20 | SPST | 1 On | 120, 240 | 25 | Quick-Disconnect Terminal | 1/4" | 3/4" | 1 3/4" | 2" | 1 3/8" | 3/16" (2) | No | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 135, 145, 155, 165, 175 | 40 | SPST | 1 On | 120, 240 | 25 | Quick-Disconnect Terminal | 1/4" | 3/4" | 1 3/4" | 2" | 1 3/8" | 3/16" (2) | No | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 175, 185, 195, 205, 215 | 40 | SPST | 1 On | 120, 240 | 25 | Quick-Disconnect Terminal | 1/4" | 3/4" | 1 3/4" | 2" | 1 3/8" | 3/16" (2) | No | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 210, 220, 230, 240, 250 | 40 | SPST | 1 On | 120, 240 | 25 | Quick-Disconnect Terminal | 1/4" | 3/4" | 1 3/4" | 2" | 1 3/8" | 3/16" (2) | No | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 250, 260, 270, 280, 290 | 40 | SPST | 1 On | 120, 240 | 25 | Quick-Disconnect Terminal | 1/4" | 3/4" | 1 3/4" | 2" | 1 3/8" | 3/16" (2) | No | 0000000 | 00000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
