Siemens 3VA1180-4EF46-0AA0 circuit breaker 3VA1 IEC frame 160 breaking capacity class S Icu=36kA @ 415V 4-pole, line protection TM240, ATAM, In=80A overload protection Ir=56A...80A short-circuit protection Ii=5...10 x In N conductor unprotected clamp conn