Siemens 3VA2510-5HL32-0AA0 circuit breaker 3VA2 IEC frame 1000 breaking capacity class M Icu=55kA @ 415V 3-pole, line protection ETU320, LI, In=1000A overload protection Ir=400A...1000A short-circuit protection Ii=1.5...10 x In nut keeper kit