What this 250 A MCCB does for your panel
The Siemens SENTRON 3VA2325-5JQ32-0AA0 is a 3-pole molded case circuit breaker rated for 250 A continuous current, designed for line protection in distribution panels. Its 800 V rated insulation voltage (cite:) suits it for 400 V and 690 V industrial networks. The interrupting capacity reaches 187 kA at 240 V (cite:), 121 kA at 415/440 V (cite:,), 75.6 kA at 500 V (cite:), and 7.5 kA at 690 V (cite:) — so it handles high-fault scenarios at common low-voltage levels while the 690 V figure confirms it can clear faults on 690 V drives or transformer secondaries, though the margin is tighter. That 187 kA at 240 V means it can sit downstream of a large transformer or a generator bus without needing a current-limiting fuse ahead of it.
Thermal performance — no derating surprises
Rated 250 A continuously from 40 °C all the way up to 70 °C ambient (cite:–). That flat thermal curve is unusual — most MCCBs start derating above 40 °C. It means this breaker can be packed into a warm enclosure or mounted next to other heat sources without losing ampacity. Maximum power loss at rated load is 37.5 W (cite:), which matters for enclosure heat calculations. Operating temperature range spans -25 °C to 70 °C (cite:,); storage range is -40 °C to 80 °C (cite:,).
Physical fit and wiring
Dimensions are 248 mm high, 138 mm wide, 110 mm deep (cite:,) — a standard 3-pole MCCB footprint that drops into most SENTRON mounting plates and panel cutouts. The 138 mm width is the critical dimension for multi-breaker spacing in a row. No undervoltage release (cite:) and no voltage-triggered trip (cite:); protection is purely thermal-magnetic with line-protection curve (cite:). Ground-fault monitoring uses summation-current formation on the L-conductor (cite:). Communication function is equipped (cite:), so it can integrate with a BMS or energy-management system via the SENTRON communication modules.