circuit breaker 3VA2 IEC Frame 1000 breaking capacity class M Icu=55 kA @ 415 V 3-pole, line protection ETU350, LSI, In=800 A overload protection Ir=320 A...800 A short-circuit protection Isd=1.5...10xIr, Ii=12xIn nut keeper kit 25.11.2015, 3270 undervoltage release 24 V DC 4 auxiliary switches