630 A MCCB for line protection — what the ratings mean for fit
The Siemens SENTRON 3VA2463-5KP32-0DC0 is a 3-pole molded case circuit breaker rated for 630 A continuous current at 40 °C, designed specifically for line protection in distribution panels. The interrupting capacity varies by system voltage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 9 kA at 690 V — so the voltage of your fault-current study determines which figure governs your SCCR. The trip unit is set with a minimum of 945 A and a maximum of 5,670 A, giving a wide adjustment band for coordination with downstream devices. Thermal derating is published across the operating range: 630 A at 40 °C, stepping down to 450 A at 70 °C. If your panel ambient runs above 40 °C — common in a packed enclosure or near a transformer — the 630 A nameplate is not the usable number; the 70 °C figure of 450 A is the one that governs your load. The breaker also includes an undervoltage release (UVR) and a communication function, meaning it can be tripped remotely or integrated into a monitoring scheme without an add-on module. Dimensions are 110 mm deep, 138 mm wide, 248 mm tall — a standard SENTRON 3VA2 fixed-mount footprint. The basic switch variant is 3VA2463-5KP32-0AA0; this order code adds the undervoltage release and communication stack. Power loss at full load is 164.5 W, which should be factored into enclosure thermal calculations.
Panel integration notes
Mounts in a standard distribution panel on a mounting plate — not DIN-rail, but a bolted fixed-mount pattern. The 138 mm width and 248 mm height fit a standard MCCB cutout; verify gland-plate clearance for the 110 mm depth, especially if the panel door has a shallow backpan. The 164.5 W dissipation at rated load means the breaker needs breathing space — avoid stacking it directly above a transformer or drive without a thermal barrier.