Siemens 3VA1 IEC frame 630 circuit breaker, breaking capacity class S, 4-pole, 500A, TM220 ATFM, Icu=36kA @ 415V, N conductor unprotected.
It carries a TM220 thermal-magnetic trip unit with ATFM (Advanced Trip Function Module), an In of 500A, overload protection adjustable Ir=350A...500A, and short-circuit protection fixed at Ii=10 x In.
The nut keeper kit is a detail for the DC Power OEM build in China — ensures the terminal hardware stays captive during transport and vibration.
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The 36 kA interrupting capacity at 415 VAC means the breaker can safely clear a fault current up to that level without failing or cascading upstream — a key spec for panel SCCR coordination and selective coordination studies.
Overload protection Ir is adjustable from 350 A to 500 A via the TM220 trip unit. Short-circuit protection Ii is fixed at 10 x In (5000 A).
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