This device provides current limitation during the commutation of the modules in the semiconductor converters of the motors. It is used in combination with fuse protection.

Are installed in each phase of the supply circuit to protect thyristor against overcurrent in emergency operating mode of the converters

The device that provides reduce the current ripples of the motor, if it operate from the thyristor converter.

Is used as a complementary part in the insulation monitor of the DC circuits.

Is designed to limit the rate of voltage fronts increasing on the motor voltage and surge in the cable and on the motor (to reduce cable radio emission).