Immersion Thermostats Immersion thermostats are thermally sensitive bi-metallic switches housed in a rugged brass or stainless steel case. The switches are manufactured to either make or break an electrical circuit at a factory pre-set temperature and they reset automatically on cooling. Some devices are ideally suited as regulating thermostats, which cycle open and closed more rapidly to maintain a temperature level. Other devices can be used as over-temperature protectors to limit a temperature from exceeding a predetermined value. Thermtrol offers complete design flexibility for custom immersion thermostats by drawing from an extensive inventory of standard components and building the thermostat that is correct for your application. Please contact Thermtrols sales team for more information.