The Siemens 3VA1125-6EF32-0AC0 is a SENTRON 3-pole molded case circuit breaker (MCCB) rated at 25 A continuous current through 50 °C, with a TM240 thermal-magnetic trip unit. Its headline breaking capacity hits 220 kA at 240 V, tapering to 154 kA at 415 V and 121 kA at 440 V — numbers that tell you this breaker is built for high-fault locations like utility tie-ins or large transformer secondaries where available fault current is serious. At 500 V and 690 V the rating drops to 17 kA, still adequate for most motor branch circuits in those voltage classes. The 70 mm depth and 76.2 mm width fit the standard Siemens 3VA footprint, so it swaps into an existing SENTRON panel without re-drilling the mounting plate.
What the ratings mean for fit
The TM240 overcurrent release is a thermal-magnetic type — the thermal element handles overloads (slow response, inverse-time curve), the magnetic element handles short-circuits (instantaneous pickup). No undervoltage release, no ground-fault monitoring, no communication module on this variant; it's a straight line-protection device. The 800 V rated insulation voltage gives headroom for 480 V and 600 V class systems. Power loss maxes at 8.5 W, which matters for thermal budgeting inside a sealed enclosure — at 25 A continuous load you're dissipating that heat into the panel air. Operating range spans -25 °C to 70 °C, storage from -40 °C to 80 °C, so it handles unconditioned electrical rooms or outdoor cabinets in temperate climates.
Dimensional check for panel swap
At 70 mm deep, 76.2 mm wide, and 130 mm tall, this breaker occupies the same 3VA frame as the 3VA1110 and 3VA1112 siblings. If you're replacing a 3VA1110-5EF32-0AM0 or 3VA1112-5EE32-0AA0, the mounting hole pattern and bus-bar spacing are identical — no rewiring of the panel backplate. The auxiliary switch configuration (2 HQ auxiliary switches) is factory-fitted; verify that the existing control wiring matches the HQ contact arrangement before committing the swap.