The SIRIUS circuit breaker 3RV20214FA10 from Siemens in size S0 is a compact, current-limiting circuit breaker for load feeders up to 18.5 kW at AC-3/400 V. Due to a short-circuit protection of 480 A and an adjustable overload protection of 34-40 A, the circuit breaker 3RV20214FA10 is ideally suited for the protection of motors.