This is a 3-pole Siemens SENTRON 3VA2025-7HN32-0AA0 molded case circuit breaker (MCCB) with a 25 A continuous current rating and an ETU350 electronic trip unit. It's designed for line protection in distribution panels, meaning the trip curve and settings are tuned for feeder or main breaker duty rather than motor or generator protection.
Interrupting capacity and what it means for your panel
The interrupting capacity hits 330 kA at 240 V, which is a very high number — this breaker can clear a massive fault without welding its contacts or rupturing. At 415 V or 440 V it's still 242 kA, and at 500 V it's 187 kA. Only at 690 V does it drop to 3 kA, so if you're on a 690 V system, this is not your breaker. For standard 480 V or 400 V industrial distribution, that's enough headroom to coordinate with most downstream devices without needing a current-limiting fuse upstream.
Physical fit and mounting
The 3VA2025-7HN32-0AA0 measures 105 mm wide by 181 mm tall by 86 mm deep. That 86 mm depth is the dimension from the mounting surface to the front of the breaker — important for enclosure depth planning. It's a standard MCCB footprint for this class, so it swaps into existing SENTRON panelboards or DIN-rail adapters without re-drilling.
Thermal performance and environment
Rated current holds at 25 A across the full ambient temperature range from 40 °C up to 70 °C — no derating needed in a hot panel. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. Front face carries IP40 protection, so it's fine for indoor panel use but not for washdown or outdoor exposure without a secondary enclosure.
Insulation voltage is rated at 800 V, giving margin above the 600 V class systems this breaker typically serves. Power loss is minimal at 0.5 W maximum, so heat buildup in a dense panel is negligible.