The SENTRON 3VA1125-5GE42-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated 25 A continuous, with a TM220 thermal-magnetic release — fixed thermal and magnetic trip settings, no adjustment dial. The interrupting capacity hits 187 kA at 240 V AC, 121 kA at 415 V, and 75.6 kA at 440 V, so it handles high-fault utility feeds and transformer secondaries without cascading upstream. The 4-pole design makes it the right fit for three-phase-plus-neutral distribution or dual-fed transfer schemes where you need to break all live conductors.
Thermal derating and panel fit
Full 25 A rating holds through 50 °C ambient; at 55 °C it derates to 24 A, and at 70 °C it's still good for 23 A. That's a shallow derating curve — useful if the breaker sits in a warm enclosure near other heat sources. The 70 mm depth and 101.6 mm width match the standard SENTRON 3VA footprint, so it drops into an existing panel layout without re-drilling the mounting plate. Front IP40 keeps dust out of the enclosure cutout.