What this MCCB delivers in the panel
The Siemens 3VA2325-7MN32-0BL0 is a SENTRON molded case circuit breaker (MCCB) rated for a continuous current Iu of 250 A, with an interrupting capacity that hits 330 kA at 240 V AC and still holds 242 kA at 415 V and 440 V. That SCCR headroom means it can sit upstream of a high-fault panel without needing a current-limiting fuse ahead of it — the breaker itself clears the fault. The ETU350M electronic trip unit gives you adjustable long-time, short-time, and instantaneous protection curves, plus phase-failure detection built in. Undervoltage release (UVR) is integrated, so a loss of control voltage drops the breaker open — useful for emergency-stop chains or safety circuits that need a guaranteed disconnect on power loss. Thermal derating is published across the full operating range: it carries the full 250 A up to 50 °C ambient, then steps down to 240 A at 55 °C, 235 A at 60 °C, 230 A at 65 °C, and 225 A at 70 °C. If your panel runs hot — say, a packed enclosure near a furnace line — that curve tells you exactly how much margin you lose. The auxiliary contact block ships with 2 auxiliary switches, 1 trip alarm switch, and 1 electrical alarm switch (HQ configuration), giving you four separate signal paths for status feedback to a PLC or annunciator panel.
Dimensions and panel fit
The 3VA2 frame measures 248 mm high, 138 mm wide, and 110 mm deep. That depth includes the arc chamber and the rear terminal space — important when sizing the enclosure depth, especially if you're back-paneling with busbars or a cable duct behind the breaker. The 3-pole footprint matches the standard SENTRON 3VA2 cutout, so a panel originally laid out for a 3VA2 MCCB accepts this unit without re-drilling or re-bussing.
Key ratings at a glance
Rated insulation voltage Ui is 800 V, so it's rated for 690 V systems with margin. Maximum power loss is 40 W — worth noting for thermal calculations in a sealed enclosure. Latching endurance is 15 000 operations, which is typical for a motor-protection MCCB that sees occasional switching, not daily cycling. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.