The Siemens 3VA1225-5GF42-0DA0 is a 4-pole molded-case circuit breaker from the 3VA1 IEC frame 250 series, rated for 250 A continuous current with a TM240 thermal-magnetic trip unit.
The TM240 trip offers adjustable overload protection (Ir) from 175 A to 250 A, so you set the continuous current limit to match the downstream load — a motor feeder or a transformer primary, for instance. The 100% N-conductor protection means the neutral pole is fully rated, not reduced — critical for 4-wire systems with harmonic content where the neutral carries sustained current. It drops the breaker open when supply voltage falls below the dropout threshold, preventing automatic reclosure on a brownout or phase loss — standard practice for motor loads that must not restart unattended.
For BOM-line commitment, the key ratings — 55 kA @ 415 V, 250 A frame, TM240 trip with adjustable Ir and Ii, and the 208–230 V UVR — are all confirmed on the order code.