Siemens 3VM1463-4EE42-0AA0 circuit breaker 3VM1 IEC frame 630 breaking capacity class N Icu=36kA @ 415V 4-pole, line protection TM220, ATFM, In=630A overload protection Ir=440A...630A short-circuit protection Ii=8 x In N conductor unprotected nut keeper k