Siemens ET 141 Electric Surface Mounted Thermostat, SPDT, (50° to 200°F)

This electric surface mounted thermostat has a Single-Pole, Double-Throw (SPDT) contact mechanism and is designed especially for mounting on pipes. As a high event temperature control, the contacts that open on a rise in temperature are used. As a low event temperature control for use on unit heaters, the contacts that open on a decrease in temperature are used. It can also be used as a convector or fan coil changeover control to automatically select either the heating or cooling function of wall type SPDT heating and cooling thermostats.