Circuit breaker 3VA2 IEC Frame 1250 breaking capacity class M Icu=55 kA @ 415 V 4-pole, line protection ETU320, LI, In=1250 A overload protection Ir=500 A ...1250 A short-circuit protection Ii=1.5...10 x In neutral conductor protection adjustable (OFF, 50%, 100%) bus connectors broadened