circuit breaker 3VA2 IEC Frame 1250 breaking capacity class H Icu=85 kA @ 415 V 3-pole, line protection ETU320, LI, In=1250 A overload protection Ir=500 A ...1250 A short-circuit protection Ii=1.5...10 x In bus connectors broadened undervoltage release 208-230 V AC 50/60 Hz 2 auxiliary switches HP