circuit breaker 3VA1 IEC Frame 630 breaking capacity class S Icu=36 kA @ 415 V 4-pole, line protection TM240, ATAM, In=630 A overload protection Ir=441 A...630 A short-circuit protection Ii=4...8 x In N conductor unprotected nut keeper kit undervoltage release 24 V DC 2 auxiliary switches HP