The TM240 release means the thermal element is calibrated for a 240 A frame — the breaker's continuous rating is set by the installed trip unit, not the frame. At 125 A continuous, it carries the full load without nuisance tripping, but the magnetic pickup (short-circuit) threshold sits higher, so motor inrush or transformer energization won't pop it prematurely. For a 125 A feeder, that's the right balance. Thermal derating is built in: the breaker holds 125 A from 40 °C up to 50 °C, then steps down through 120 A at 55 °C to 112.5 A at 70 °C. The shunt trip (STL) auxiliary release is included (order code 3VA9688-0BL32 for the integrated trip block). The 2 HQ auxiliary switches give you status feedback (open/closed) back to the PLC or panel indicators.
That's a standard 3-pole MCCB cutout — it fits existing SENTRON 3VA panel layouts without re-drilling. The front face carries an IP40 rating, meaning tools or fingers won't reach live parts; the body itself is open to the enclosure environment, so keep the overall panel IP rating in mind. If you need those functions, you step up to the electronic-trip or communicating versions in the 3VA family.
No formal successor exists because none is needed — this is the current generation. If you're replacing an older Siemens 3VL or earlier 3VF series breaker, the 3VA family is the direct upgrade path; check the mounting footprint and terminal spacing against your existing panel layout before ordering.