Siemens 3VA2325-5MN32-0AA0 circuit breaker 3VA2 IEC frame 400 breaking capacity class M Icu=55kA @ 415V 3-pole, motor protection ETU350M, LSI, In=250A overload protection Ir=100A...250A short-circuit protection Isd=3...15 x Ir, Ii=15 x In nut keeper kit