Bimetal Disc-Type Thermostats
Resetting
Most manufacturers of disc type controls can also control the reset temperatures of the device. This can provide the end user with the option to specify a wide or narrow temperature differential between the opening temperature and the closing temperature of the controls. A narrow differential between the opening and closing temperature makes disc type devices suitable for use in temperature control applications. If these devices are produced with a wider temperature differential between the opening and closing temperature, then these devices are ideal for use as an over temperature protector in many higher load applications. Some types are available with a "manual" reset function. This means that once the device has functioned due to a fault condition in the application, then the user must manually press a button connected to the device, to reset the electrical contacts. This feature is normally associated with applications where a true fault has occurred in the application and it alerts the end user as to a problem. Again, some disc type devices are available with self-hold functionality that essentially prevents them from resetting unless the power source to the entire application is interrupted.