The Siemens SENTRON 3VA1225-5FF42-0CH0 is a 4-pole molded case circuit breaker (MCCB) rated for 250 A continuous current at 40 °C, with a rated insulation voltage of 800 V. The TM240 thermal-magnetic release provides line protection (overload and short-circuit) without an electronic trip unit, making it a straightforward replacement in existing switchboards. Above 55 °C it begins to taper: 243.3 A at 55 °C, 236.5 A at 60 °C, 229 A at 65 °C, and 223 A at 70 °C. The IP40 front protection means it is suited for indoor panel mounting where no water jets or dust ingress are expected. Dimensions are 158 mm high, 140 mm wide, 70 mm deep — a standard SENTRON 3VA form factor that fits the same DIN-rail or screw-mount footprint as other 250 A frames in the series.
No communication function or ground-fault monitoring is included, so if those are required, a different variant or external add-on is needed.
The N-conductor protection is set to 50% of the phase rating, which is typical for 4-pole breakers feeding a mixed single-phase/three-phase load. The latching endurance is rated at 15 000 operations — sufficient for a main breaker or feeder that sees infrequent switching, but not for a motor-starting duty cycle.