Siemens 3VA1463-4EF42-0AA0 circuit breaker 3VA1 IEC frame 630 breaking capacity class S Icu=36kA @ 415V 4-pole, line protection TM240, ATAM, In=630A overload protection Ir=440A...630A short-circuit protection Ii=4...8 x In N conductor unprotected nut keep