thermal protection relay / contactor mount / automatic reset / manual reset
Txx series ABB



  • Measured/monitored value:


  • Other characteristics:

    contactor mount, automatic reset, manual reset, three-phase

  • Tripping current:

    Min.: 40 A

    Max.: 200 A


Thermal overload relays are economic electromechanical protection devices for the main circuit. They offer reliable protection for motors in the event of overload or phase failure. Starter combinations are setup together with block contactors and mini contactors.
The thermal overload relays 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 (over current), 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 (95-96 / 97-98).