The Siemens 3VA1225-4EF42-0AA0-ZD00 is a 4-pole IEC frame 250 circuit breaker from the 3VA1 series, rated at In=250A with a breaking capacity class S delivering Icu=36kA at 415V. It uses a TM240 thermal-magnetic trip unit providing overload protection adjustable from Ir=175A up to 250A and short-circuit protection set at Ii=5 to 10 times In. The N conductor is unprotected, and the breaker includes a nut keeper kit for DC Power OEM applications in China.
Mounts on a standard DIN rail inside a panel enclosure. The 4-pole footprint and frame 250 size require adequate side clearance for heat dissipation and cable bending radius — typical for IEC switchgear layouts. The nut keeper kit is specific to the DC Power OEM build and should be verified against the panel's busbar arrangement before installation.