What this 630 A MCCB carries — and where it holds the line
The Siemens SENTRON 3VA2463-6JP32-0HC0 is a 3-pole molded case circuit breaker rated for 630 A continuous current at 40 °C, designed for line protection in industrial power distribution. Its interrupting capacity reaches 242 kA at 240 V and 187 kA at 415 V, falling to 9 kA at 690 V — the high 240 V figure means this breaker handles the available fault current on the secondary side of a typical 480 V–240 V step-down transformer without cascading upstream. Thermal derating is published across the ambient range: 630 A at 40 °C, 570 A at 50 °C, 510 A at 60 °C, and 450 A at 70 °C, so the continuous current you can actually pass depends on the panel internal temperature, not just the nameplate. Adjustable short-time pickup spans 945 A to 5 670 A. Includes a shunt trip (STL) auxiliary release, two HQ auxiliary switches, and a communication function. The base switch is order code 3VA2463-6JP32-0AA0, meaning this -0HC0 variant adds the communication and auxiliary-switch package on top of the same interruptor core.