The Siemens series SIRIUS Circuit breaker for motor protection shuts down safe in the event of a short circuit and protection of the loads and system against overload, as well as for safe separation of the system from the network. The 3RV2 circuit breakers replace the 3RV1 series because it proved to be more efficient, simple and up to date. for range 3RT.Surge suppressor, varistor. Power supply required 400- 600 V AC, for contactor relays and motor contactors Size S00. Mounting type is clip-on