What the ratings mean for fit
The Siemens SENTRON 3VA1112-6EF32-0HH0 is a 3-pole molded case circuit breaker rated for a continuous current of 125 A at ambient temperatures up to 50 °C, derating to 112.5 A at 70 °C. Its interrupting capacity hits 220 kA at 240 V AC, 154 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 690 V — so it handles high-fault utility feeds and transformer secondaries without cascading upstream. The TM240 thermal-magnetic release provides fixed overload and short-circuit protection for line distribution, not motor starting. A shunt trip (STL) is integrated, and the auxiliary contact block carries 2 auxiliary switches plus 1 trip alarm switch (HQ). Front IP40 suits panel-mount indoor use; no communication or ground-fault monitoring is built in.
Panel integration and mounting
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep — a standard SENTRON 3VA footprint that fits existing DIN-rail or screw-mount panel layouts. The IP40 front protection means it is rated for indoor enclosures where tools or fingers might contact the front, but not for washdown or outdoor exposure. The shunt trip (STL) and auxiliary switch block (2 aux + 1 alarm) are factory-integrated, so no separate accessory wiring is needed for remote trip and status feedback.