Circuit breaker 3VA2 IEC Frame 630 breaking capacity class M Icu=55 kA @ 415 V 4-pole, line protection ETU350, LSI, In=630 A overload protection Ir=250 A...630 A short-circuit protection Isd=1.5...9x Ir, Ii=9x In neutral conductor protection adjustable (OFF, 50%, 100%) nut keeper kit