What this MCCB carries and where it lands
The Siemens SENTRON 3VA2125-8HM32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection duty. It carries a continuous current Iu of 25 A across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. The interrupting capacity hits 440 kA at 240 V and 330 kA at 415 V and 440 V, dropping to 220 kA at 500 V and 52.5 kA at 690 V. That kind of headroom means it clears high-fault scenarios without cascading upstream — selectivity stays intact even on a stiff utility feed. The electronic trip unit is an ETU330, which gives adjustable overload and short-circuit protection curves. Rated insulation voltage Ui is 800 V, so it handles 480/600 V class systems without issue. Front-side IP40 keeps dust out of the mechanism in a clean panel environment; the enclosure is sized at 105 mm wide, 86 mm deep, 181 mm tall — standard 3-pole MCCB footprint for DIN-rail or screw-mount integration.
Integration and mounting notes
The 105 mm width and 86 mm depth fit a standard 3-pole MCCB slot in a panel — no special adapter plate needed. Mounts on DIN rail or via the screw-mount lugs that come with the frame. The front IP40 rating means it can go in a ventilated enclosure without a separate cover over the breaker face. Optional motor drive is available for remote tripping or re-closing schemes.