SENTRON 3VA2125-7HK32-0AA0 — 25 A MCCB with ETU340 trip unit
The Siemens 3VA2125-7HK32-0AA0 is a SENTRON molded case circuit breaker rated for 25 A continuous current with no derating across the full -25 °C to 70 °C operating range — the same 25 A holds at 40 °C, 55 °C, and 65 °C, so you don't have to upsize for a warm panel. It carries an ETU340 electronic overcurrent release, giving you adjustable long-time, short-time, instantaneous, and ground-fault protection curves — a step up from fixed thermal-magnetic trip units for selectivity coordination. Rated insulation voltage is 800 V, and the interrupting ratings climb to 330 kA at 240 V, 242 kA at 415 V, and 187 kA at 500 V, dropping to 3.7 kA at 690 V — enough headroom for most distribution panels without cascading upstream breakers.
Panel integration and mounting
The 3-pole breaker measures 105 mm wide, 181 mm tall, and 86 mm deep — fits standard DIN-rail or screw-mount patterns in a SENTRON distribution panel. IP40 protection on the front face is adequate for enclosed panel mounting; no washdown rating, so keep it behind a gland plate in wet environments. Maximum power loss is 0.6 W — negligible for thermal budgeting inside a crowded enclosure.