circuit breaker 3VA2 IEC frame 1000 breaking capacity class M Icu=55kA @ 415V 4-pole, line protection ETU550, LSI, In=800A overload protection Ir=320A…800A short-circuit protection Isd=0.6..10x In, Ii=1.5..12x In N conductor protection adjustable (OFF, up to 160%) nut keeper kit