Snap-Action Thermostats
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.
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.
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.
Overall | Mounting | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temperature Setting | Temperature Differential | Switch Type | Switch Starting Position | Voltage | Current | Wire Connection Type | Terminal Size | Face Dia. | Ht. | Wd. | Dp. | Hole Dia. (No. of) | Fasteners Included | Each | |
Close at Temperature Setting | |||||||||||||||
| 90° F, 100° F, 110° F, 120° F, 130° F | 20° F | SPST | 1 Off (Normally Open) | 120V AC/240V AC | 25A | Quick-Disconnect Terminals | 1/4" | 3/4" | 1 3/4" | 2" | 1 3/8" | 3/16" (2) | No | 0000000 | 000000 |
| 140° F, 150° F, 160° F, 170° F, 180° F | 20° F | SPST | 1 Off (Normally Open) | 120V AC/240V AC | 25A | Quick-Disconnect Terminals | 1/4" | 3/4" | 1 3/4" | 2" | 1 3/8" | 3/16" (2) | No | 0000000 | 00000 |
Open at Temperature Setting | |||||||||||||||
| 135° F, 145° F, 155° F, 165° F, 175° F | 20° F | SPST | 1 On (Normally Closed) | 120V AC/240V AC | 25A | Quick-Disconnect Terminals | 1/4" | 3/4" | 1 3/4" | 2" | 1 3/8" | 3/16" (2) | No | 0000000 | 00000 |
| 135° F, 145° F, 155° F, 165° F, 175° F | 40° F | SPST | 1 On (Normally Closed) | 120V AC/240V AC | 25A | Quick-Disconnect Terminals | 1/4" | 3/4" | 1 3/4" | 2" | 1 3/8" | 3/16" (2) | No | 0000000 | 00000 |
| 175° F, 185° F, 195° F, 205° F, 215° F | 40° F | SPST | 1 On (Normally Closed) | 120V AC/240V AC | 25A | Quick-Disconnect Terminals | 1/4" | 3/4" | 1 3/4" | 2" | 1 3/8" | 3/16" (2) | No | 0000000 | 00000 |
| 210° F, 220° F, 230° F, 240° F, 250° F | 40° F | SPST | 1 On (Normally Closed) | 120V AC/240V AC | 25A | Quick-Disconnect Terminals | 1/4" | 3/4" | 1 3/4" | 2" | 1 3/8" | 3/16" (2) | No | 0000000 | 00000 |
| 250° F, 260° F, 270° F, 280° F, 290° F | 40° F | SPST | 1 On (Normally Closed) | 120V AC/240V AC | 25A | Quick-Disconnect Terminals | 1/4" | 3/4" | 1 3/4" | 2" | 1 3/8" | 3/16" (2) | No | 0000000 | 00000 |
Heat-Actuated Switches
Open or close a circuit when a fusible link melts. These switches are often used as a safety switch to shut off hydraulic equipment. Mount them to an electrical box indoors.
Replace the fusible link (sold separately) to reset the switch.
Heat-Actuated Switches | Fusible Links | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Fusible Link Melting Temperature | No. of Circuits Controlled | Switch Starting Position | Switch Action | No. of Terminals | Industry Designation | Switching Current @ Voltage | Maximum Voltage | Each | Each | ||
With Quick-Disconnect Terminals | |||||||||||
| 135° F | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | Stays Switched (Maintained) | 3 | SPDT | 20 A @ 120 V AC | 120V AC | 000000 | 0000000 | 00000000 | 00000 |
| 155° F | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | Stays Switched (Maintained) | 3 | SPDT | 20 A @ 120 V AC | 120V AC | 000000 | 000000 | 00000000 | 0000 |
| 165° F | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | Stays Switched (Maintained) | 3 | SPDT | 20 A @ 120 V AC | 120V AC | 0000000 | 000000 | 0000000 | 0000 |
| 212° F | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | Stays Switched (Maintained) | 3 | SPDT | 20 A @ 120 V AC | 120V AC | 0000000 | 000000 | 0000000 | 0000 |
| 280° F | 1 | 1 Off (Normally Open) or 1 On (Normally Closed) | Stays Switched (Maintained) | 3 | SPDT | 20 A @ 120 V AC | 120V AC | 0000000 | 000000 | 0000000 | 0000 |