Circuit breaker 3VA2 IEC Frame 400 breaking capacity class M Icu=55 kA @ 415 V 4-pole, line protection ETU550, LSI, In=400 A overload protection Ir=160 A...400 A short-circuit protection Isd=0.6..10x In, Ii=1.5..10x In neutral conductor protection adjustable (OFF, up to 100%) nut keeper kit