The Siemens 3VA1125-3ED42-0AA0-ZD00 is a 4-pole IEC frame 160 molded case circuit breaker with a 25 A thermal-magnetic trip unit (TM210, fixed Ir=25 A) and a short-circuit release set at 12.8 x In. The neutral pole is switched only, with no overload or short-circuit protection.
Because this is a configured OEM variant (ZD00 suffix), availability may be less predictable than a standard catalog breaker.
Mounts in the standard 3VA1 DIN-rail or screw-mount footprint — 4-pole frame takes the same panel cutout as the 3-pole plus one neutral pole width. The nut keeper kit is pre-installed on the DC-power terminals; verify torque spec on the nameplate before landing lugs.
