circuit breaker 3VA2 IEC frame 250 breaking capacity class L Icu=150kA @ 415V 3-pole, line protection ETU330, LIG, In=250A overload protection Ir=100A…250A short-circuit protection Ii=1.5…10 x In ground-fault protection Ig=0.2…1 x In, tg=0.1/0.3s nut keeper kit