What this 630 A MCCB does on the line
The Siemens SENTRON 3VA2463-6KP32-0AC0 is a three-pole molded case circuit breaker rated for 630 A continuous current at 40 °C, designed for line protection in distribution panels. Its breaking capacity reaches 242 kA at 240 V and 187 kA at 415 V, meaning it can safely interrupt high fault currents without cascading upstream — sized for large industrial feeders or transformer secondaries where fault levels are severe. The 630 A rating is the continuous current at 40 °C ambient; above that, the thermal derating curve applies: 600 A at 45 °C, 570 A at 50 °C, 540 A at 55 °C, 510 A at 60 °C, 480 A at 65 °C, and 450 A at 70 °C. A panel builder in a hot enclosure needs to account for that curve rather than the headline number. This MCCB carries a communication function, which means it can integrate into a higher-level monitoring or control system — typical for a plant with power-management software or a BMS that needs breaker status and trip data. It is fitted with two auxiliary switches (HQ design) for remote indication of open/closed or tripped state. No undervoltage release or ground-fault monitoring is included on this variant; those would be separate order-code options.
Breaking capacity — what the numbers mean for your fault study
The rated ultimate short-circuit breaking capacity (Icu) is given at multiple voltage levels: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 9 kA at 690 V. The sharp drop at 690 V is typical for an air-break MCCB — arc extinction gets harder as voltage rises. For a 400 V-class industrial panel, the 187 kA figure is the relevant one; it confirms the breaker can handle the full fault current at the secondary side of a large transformer without needing a current-limiting upstream device. The minimum breaking capacity is listed at 945 A, and the maximum at 5,670 A — these define the range over which the breaker's trip curve is guaranteed to operate.
Physical fit and panel integration
The breaker measures 248 mm high, 138 mm wide, and 110 mm deep. The 138 mm width occupies three DIN-rail modules. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Power loss at full rated current is 162 W maximum.