circuit breaker 3VA2 IEC frame 630 breaking capacity class H Icu=85kA @ 415V 3-pole, line protection ETU550, LSI, In=400A overload protection Ir=160A…400A short-circuit protection Isd=0.6..10x In, Ii=1.5..15x In N conductor protection optionally with external current transformer, up to 160% nut keeper kit