circuit breaker 3VA2 IEC frame 1000 breaking capacity class C Icu=110kA @ 415V 4-pole, line protection ETU350, LSI, In=630A overload protection Ir=250A…630A short-circuit protection Isd=1.5…10 x Ir, Ii=12 x In N conductor protection adjustable (OFF, 50%, 100%) nut keeper kit