The Siemens SENTRON 3VA1125-6EF32-0AB0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a TM240 thermal-magnetic release and a continuous current of 25 A at 40 °C. It's built for the main feeder or a big branch in a distribution panel — the kind of spot where you need serious fault-clearing without taking up a lot of DIN rail real estate. At 70 mm deep, 76.2 mm wide, and 130 mm tall, it fits standard MCCB mounting footprints, so it'll swap into existing SENTRON or legacy 3VA cutouts without panel rework. The interrupting capacity is the headline here: 220 kA at 240 V, dropping to 154 kA at 415 V, 121 kA at 440 V, and still holding 17 kA all the way up to 690 V. For a 25 A frame, that's a lot of headroom; you're not pushing the limits even on a stiff industrial service.
The TM240 release holds a flat 25 A from 40 °C up to 50 °C, then drops to 24 A at 55 °C and 60 °C, and 23 A at 65 °C and 70 °C. That's not a showstopper for most motor or feeder circuits, but it means you size the breaker for the actual ambient, not the catalog number.
What's built in and what isn't
The 3VA1125-6EF32-0AB0 comes with two auxiliary switches (HP design) pre-installed, which is handy for remote status indication or tripping a downstream contactor. It's a straight thermal-magnetic line-protection breaker — no frills, no electronics to fail. The supplied basic switch is 3VA11256EF320AA0, so if you need a replacement mechanism that's the core assembly. Power loss is 8.5 W maximum, which matters for heat buildup in a sealed enclosure.
Environmental limits and storage
That covers unheated warehouses and outdoor cabinets in most climates. The storage minimum is the real limit — if it's been sitting in a frozen truck, let it warm up before slamming a fault through it.