circuit breaker 3VA2 IEC Frame 630 breaking capacity class M Icu=55 kA @ 415 V 3-pole, motor protection ETU550M, LSI, In=400 A overload protection Ir=160 A ...400 A short-circuit protection Isd=1.2... 15x In,Ii=3..15x In nut keeper kit undervoltage release 120-127 V AC 50/60 Hz 3 auxiliary switches HQ