Starting resistors are connected for starting three-phase motors with wound rotors or direct-current motors in the rotor circuit and switched off again in stages.

The resistor and its stage arrangement define the starting behaviour of the drive.

Application:
Pumps, compressors

Slip resistors for three-phase motors with wound rotors are permanently connected to the rotor circuit. The slip power, approximately 5-12% of the nominal power, is eradicated in the slip resistance.

The drive behaviour becomes softer and the load responses to the feeding network are dampened.

Application:
Crusher drive

Braking resistors for drives with frequency converters are switched on and off in connection with braking choppers and eliminate the excess voltage in the intermediate circuit.

Application:
Conveyor systems

Railway resistors are used in drive systems to brake e-motors with large moments of inertia. The power generated in the generating mode is converted into heat by the resistors wound with ribbon.

Application:
Transport systems

Crane resistors are rotor resistors from cast elements or steel grille elements with separate taps depending on the application.

Application:
lifting equipment, undercarriages