The Siemens 3VA1225-5GF42-0JC0 is a 4-pole SENTRON molded case circuit breaker rated for 250 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release. Its 187 kA breaking capacity at 240 V and 121 kA at 415 V give it the headroom to clear high-fault events without cascading upstream — critical for a main or feeder breaker in a distribution panel where SCCR coordination matters. The 158 mm height, 140 mm width, and 70 mm depth fit the standard SENTRON 3VA footprint, so it drops into a panel already laid out for the series without re-drilling the mounting plate or re-routing busbars. Rated insulation voltage of 800 V means it's suited for 690 V line-to-line systems common in industrial and utility networks, and the IP40 front protection keeps debris out of the enclosure face in a clean panel environment.
Above that, derating is linear: 243.3 A at 55 °C, 236.5 A at 60 °C, 229 A at 65 °C, and 223 A at 70 °C.
The 187 kA at 240 V and 121 kA at 415 V cover most low-voltage distribution scenarios. At 440 V the rating drops to 36 kA, and at 690 V to 17 kA — still enough for most motor-control-center feeder applications at that voltage, but worth verifying against the transformer impedance and available fault current on site.
Integrated trip options and auxiliary contacts
The integrated auxiliary trip is order code 3VA9688-0BL32, so if you need a spare or replacement, that's the part to source alongside this MCCB.