Feature of Tmax MPCB, Duty mode setting (Normal/Heavy): Normal duty mode requires use of a circuit-breaker and a contactor. In the case of tripping, the Ekip M-LRIU release commands the opening of the contactor via PR212/CI; Heavy duty mode foresees circuit-breaker opening for all overcurrent conditions, and just the function of motor operation is entrusted to the contactor, PTC protection setting: PTC: this protection, monitors the temperature inside the protected motor by means of a PTC sensor., ABB Solutions for Starting, switching and protection of three-phase asynchronous motors- A traditional system, A system of integrated protection.