630 A MCCB with 242 kA interrupting capacity
The Siemens SENTRON 3VA2463-6JQ32-0CA0 is a 3-pole molded case circuit breaker rated for 630 A continuous current at 40 °C. Its interrupting capacity hits 242 kA at 240 V, stepping down to 187 kA at 415 V and 440 V, 121 kA at 500 V, and 40 kA at 690 V — that's a fault-current envelope that covers most industrial service-entrance and large-feeder applications without needing a current-limiting fuse upstream. The ETU560 electronic trip unit handles the protection curve, and the built-in undervoltage release (UVR) lets you drop the breaker on a control signal or safety circuit.
Thermal derating and panel fit
The 630 A rating holds at 40 °C ambient. Above that, derate in 10 °C steps: 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. If your panel ambient runs hot — say, a packed enclosure near a furnace line — size the feeder for the derated figure, not the nameplate. The breaker body measures 248 mm high by 138 mm wide by 110 mm deep, which is the standard 3VA frame footprint; it mounts on a DIN rail or directly to the backplate with the supplied hardware.
What the ratings mean for your panel
The 242 kA at 240 V is the maximum short-circuit current the breaker can safely interrupt at that voltage — essential for service-entrance gear where the utility fault current can exceed 100 kA. At 690 V the rating drops to 40 kA, still enough for most 690 V motor control centers. The 800 V rated insulation voltage (Ui) means the breaker's internal clearances are designed for 690 V systems with margin. Power dissipation maxes at 164.5 W per pole — factor that into your enclosure cooling calculation if you're packing multiple breakers in a closed cabinet.