Circuit breaker 3VA2 IEC Frame 630 breaking capacity class M Icu=55 kA @ 415 V 3-pole, line protection ETU550, LSI, In=630 A overload protection Ir=250 A...630 A short-circuit protection Isd=0.6..9x In, Ii=1.5..9x In neutral conductor protection optionally with external current transformer, up to 160% nut keeper kit