The Siemens SENTRON 3VA1125-3EF32-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection duty, carrying 25 A continuously at 40 °C ambient and holding that rating through 50 °C — it only begins to derate at 55 °C (24 A) and reaches 23 A at 70 °C. Breaking capacity hits 75.6 kA at 240 V AC, 52.5 kA at 415 V, and 32 kA at 440 V, so it handles substantial fault current on 400 V-class distribution panels without needing an upstream current-limiting fuse.
The 70 mm depth and 76.2 mm width (3 in.) fit standard Siemens SENTRON panel footprints — it occupies the same 3-pole slot as other 3VA frame breakers, so a panel laid out for the 3VA family accepts this unit without re-drilling or bus-bar rework.
Insulation voltage is rated 800 V, giving headroom on 690 V systems. Maximum power loss is 8.5 W — manageable in a ventilated enclosure but worth checking if the panel is sealed and densely packed. The design includes a trip indicator and a voltage trigger, both standard for line-protection MCCBs in this series.