What this MCCB is and where it fits
The Siemens SENTRON 3VA2325-6HN32-0CA0 is a 3-pole molded case circuit breaker (MCCB) rated for 250 A continuous current across the full operating range from 40 °C to 70 °C — no derating needed as the panel warms up. It's built for line protection in main distribution panels, switchboards, and industrial power feeds where high fault currents live.
Interrupting capacity — the real story for coordination
The breaking capacity here is the headline: 242 kA at 240 VAC, 187 kA at 415 V and 440 V, 121 kA at 500 V, and still 7.5 kA at 690 V. That 242 kA figure at 240 V means this breaker clears a bolted fault on a large transformer secondary without the arc flashing over to the bus — it's sized for high-available-fault-current installations where a standard 65 kA or 100 kA MCCB would weld its contacts shut. The 7.5 kA at 690 V tells you it's usable on 690 V systems but the fault current there needs to stay modest; downstream coordination has to respect that cliff.
What's built in — undervoltage release and thermal performance
This variant includes an undervoltage release (UVR) — the auxiliary release type is marked as undervoltage release. That's the coil that trips the breaker if supply voltage drops below a threshold, common in safety circuits and motor feeder protection where you want the load dropped on a brownout. No auxiliary switch fitted, no ground-fault monitoring, no communication module. The power loss maxes at 40 W, so panel ventilation is straightforward even in a crowded enclosure. Dimensions: 248 mm high, 138 mm wide, 110 mm deep — a standard 3-pole MCCB footprint that bolts into a SENTRON mounting base or direct-panel mount.