Thermal Overload Relays

Thermal Overload Relays offer economical and reliable protection for motors in the event of overload or phase failure. The devices have trip class 10.

The TORs are three pole relays with bimetal tripping elements. The motor current flows through the bimetal tripping elements and heats them directly and indirectly. In case of an overload (overcurrent), the bimetal elements bent as a result of the heating. This leads to a release of the relay and a change of the contacts switching position.