What this MCCB is and what it does
The Siemens SENTRON 3VA2325-7MN32-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuously across the full 40 °C to 70 °C ambient range — no derating needed as the panel warms up. That flat thermal curve is unusual and simplifies panel coordination: you size the bus and downstream gear for a solid 250 A, not a sliding number. It is specifically designed for motor protection, which means the trip curve is shaped to handle motor inrush without nuisance tripping while still clearing a locked-rotor fault. Phase failure detection is built in — if one phase drops, the breaker opens before single-phasing cooks the winding. The interrupting ratings climb with available fault current: 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 (–). That 330 kA figure at 240 V covers high-fault locations like transformer secondaries or large motor control centers without needing a current-limiting fuse upstream.
Undervoltage release and auxiliary options
This variant ships with an undervoltage release (UVR) fitted — the breaker trips if control voltage drops below a set threshold, which is standard for safety circuits that need to drop power on loss of control supply. No auxiliary switch is included, so if you need remote status feedback, that's a separate add-on. The basic switch variant is 3VA2325-7MN32-0AA0 — the -0BA0 adds the UVR. If your BOM already calls for the -0AA0 and you need undervoltage protection, this is the drop-in replacement with the release integrated.
Physical fit and panel integration
Dimensions: 248 mm high, 138 mm wide, 110 mm deep. That 138 mm width is standard for a 3-pole SENTRON frame — it fits the same mounting footprint as other 3VA2 breakers in the family, so a panel laid out for a 250 A frame accepts this without re-drilling. Maximum power dissipation is 40 W — account for that heat in the enclosure sizing, especially if multiple breakers are ganged in a sealed cabinet.