What it is and what it does
The Siemens SENTRON 3VA2325-7MS32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. It carries an ETU310M electronic overcurrent release, designed for starter protection duty, meaning it's tuned to handle motor inrush without nuisance trips while still clearing a fault fast. The insulation voltage is rated 800 V, so it's comfortable on 400/480 VAC systems with headroom.
Breaking capacity — what the numbers mean for your fault level
This MCCB's breaking capacity climbs with system voltage: 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 7.5 kA at 690 V. The 330 kA at 240 V is exceptional — that's transformer-secondary or large-bus fault levels, not a branch circuit. At 690 V the drop to 7.5 kA reflects the physical limits of arc extinction at higher voltage; if your system runs 690 V and fault current exceeds that, you need a different frame or a current-limiting upstream device. The 242 kA at 415 V covers most industrial 400 V distribution boards with high fault capacity.
Panel fit — dimensions and integration
The 3VA2325-7MS32-0AA0 measures 248 mm high, 138 mm wide, and 110 mm deep. That 138 mm width is a standard 3-pole MCCB footprint for this current class — it drops into the same cutout as other SENTRON 3VA frames. Maximum power loss at rated current is 37.5 W, so factor that into enclosure thermal rise, especially in a sealed panel without forced ventilation. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C.