What this 630 A MCCB delivers
The Siemens SENTRON 3VA2463-6JP32-0AJ0 is a 3-pole molded case circuit breaker rated for 630 A continuous current at 40 °C, designed for line protection in industrial distribution panels. Its interrupting capacity reaches 242 kA at 240 V AC and holds 187 kA at 415 V and 440 V, dropping to 121 kA at 500 V and 9 kA at 690 V — so it handles high-fault utility feeds and transformer secondaries without cascading upstream. The breaker includes a communication function for integration into a monitored power system, plus 2 auxiliary switches and 1 trip alarm switch for remote status indication.
Temperature derating and power loss
The 630 A rating applies at 40 °C ambient. Above that, the breaker derates linearly: 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. Maximum power loss is 162 W at rated load — a figure to account for in enclosure thermal calculations. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Physical fit and panel integration
Dimensions are 248 mm high, 138 mm wide, 110 mm deep (9.76 × 5.43 × 4.33 inches). The 3-pole frame mounts on a DIN rail or direct panel; the 110 mm depth leaves clearance for rear-connected busbars and cable ladders. A trip indicator is present for quick fault identification.