The surface mount thermostat works on the principle of volume expansion, if the temperature of the filling medium inside the probe increases the volume increases which results in the elevation of a diagrapm that triggers a microswitch.

IP54 Rated
1xSPDT switching contact
Temperature control or temperature monitoring functions
Differential of 3-4%

With the ATHs-1 the switching point can be adjusted from the outside, with the ATHs-2 the switching point can be adjusted on the inside. U= Screw in pocket, UZ=screw in pocket with extension