What this MCCB carries and where it fits
The Siemens 3VA1112-4EF32-0HH0 is a SENTRON molded case circuit breaker (MCCB) rated for 125 A continuous current at 40 °C, with a TM240 thermal-magnetic overcurrent release. It's a 3-pole line-protection device built for distribution panels where high interrupting capacity is the deciding spec — 121 kA at 240 V, 75.6 kA at 415 V, and still 11.9 kA at 690 V. That kind of SCCR headroom means it can sit upstream of a fault-heavy feeder without cascading, which is what you want when coordinating a main breaker with downstream branch devices. The TM240 release is a fixed thermal-magnetic trip — no interchangeable rating plug, so the 125 A frame is what you get. That's fine for a dedicated feeder or a fixed-load panel where the ampacity isn't changing. The unit includes a shunt trip (STL) for remote opening and comes with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration), which gives you status feedback back to a PLC or annunciator without adding an external relay pack.
Dimensions and panel fit
At 70 mm deep, 76.2 mm wide, and 130 mm tall, this MCCB fits the standard SENTRON 3VA footprint. The 76.2 mm width is a 3-module (3 x 25.4 mm) DIN-rail pitch — it snaps onto the rail without adapters. IP40 on the front means it's protected against solid objects over 1 mm but not sealed against moisture; keep it inside the enclosure, not on a washdown panel face.