630 A continuous, 187 kA interrupting — the mainline breaker for high-fault panels
The Siemens SENTRON 3VM1463-5GD42-0AA0 is a 4-pole molded case circuit breaker rated for 630 A continuous at 40 °C, with a TM210 thermal-magnetic overcurrent release. It handles fault currents up to 187 kA at 240 V AC and 121 kA at 415 V AC — enough to clear a high-capacity transformer secondary or a large motor control center bus without upstream coordination issues. Rated insulation voltage is 800 V, and the front face carries IP40 protection — fine for a clean indoor switchboard, but keep it out of washdown zones. Maximum power loss at full load is 193 W, so plan for ventilation if you're packing multiple breakers in a compact enclosure.
Thermal derating and ambient — what the 630 A rating actually means in your panel
The 630 A rating holds flat from 40 °C through 50 °C. At 55 °C it derates to 618 A, at 60 °C to 607 A, and at 65 °C to 595 A. At the 70 °C maximum operating ambient it still carries 583 A. That's a shallow derating curve — useful when the breaker sits near other heat sources in a crowded lineup. Storage range is -40 °C to 80 °C; operating range -25 °C to 70 °C. The storage limit governs handling and warehousing, not running conditions.
Panel fit — dimensions and mounting
The 3VM1463-5GD42-0AA0 measures 248 mm high, 184 mm wide, and 110 mm deep. That 110 mm depth is the key dimension for enclosure depth planning.
Interrupting performance across common voltages
Rated short-circuit breaking capacity: 187 kA at 240 V AC, 121 kA at 415 V and 440 V, and 76 kA at 500 V. The 121 kA at 415 V is the figure most relevant for European 400 V distribution — it clears a fault on a large transformer secondary without needing a current-limiting upstream breaker.