circuit breaker 3VA2 IEC Frame 1000 breaking capacity class M Icu=55 kA @ 415 V 3-pole, line protection ETU350, LSI, In=630 A overload protection Ir=250 A...630 A short-circuit protection Isd=1.5...10 x Ir, Ii=12 x In nut keeper kit circuit breaker 3VA2 IEC Frame 1000 breaking capacity class M Icu=55 kA @ 415 V undervoltage release 24 V DC