The Siemens 3VM1125-4ED42-0AA0 is a 4-pole IEC circuit breaker on the 3VM1 frame, rated 25 A with a TM210 thermal-magnetic trip unit. Overload protection is fixed at Ir = 25 A; short-circuit pickup is set at 12.8 × In (320 A), non-adjustable.
No neutral conductor protection means the installer runs a solid neutral bar through the breaker without a pole; verify the downstream neutral bus is rated for the full fault current.
