3VU13 and 3VU16 circuit breakers are compact circuit breakers for currents up to 63A, which operate according to the current limiting principle. The devices are used for switch and protecting motors or other loads. They are fitted with instantaneous overcurrent releases and inverse-time delayed overload relay.

They can also be supplied with instantaneous overcurrent releases only. Circuit-breakers and contactors can be combined to form fuseless starter combinations.