What it is and what it does
The Siemens SENTRON 3VA2463-6JP32-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated for 630 A continuous current at 40 °C, designed for line protection in distribution panels and switchgear assemblies. Its headline breaking capacity reaches 242 kA at 240 V AC, dropping to 187 kA at 415 V and 440 V, then 121 kA at 500 V, and 9 kA at 690 V — meaning it can safely interrupt fault currents up to those levels without cascading upstream, which is the key selectivity figure for a main or feeder breaker in a high-fault installation. The adjustable thermal-magnetic trip unit covers a range from 945 A minimum to 5 670 A maximum, giving the specifying engineer room to coordinate with downstream breakers.
Thermal derating — the real-world current you can actually use
The 630 A rating holds only at 40 °C ambient. At 45 °C it derates to 600 A, at 50 °C to 570 A, at 55 °C to 540 A, at 60 °C to 510 A, at 65 °C to 480 A, and at 70 °C to 450 A. If your panel ambient runs hot — common in a packed enclosure or near a transformer — the 630 A nameplate is not what you can pull continuously.
Integration and footprint
At 248 mm high, 138 mm wide, and 110 mm deep, this MCCB fits standard Siemens SENTRON mounting patterns for 630 A frame sizes. The 110 mm depth keeps the breaker clear of the gland plate in a 600 mm deep enclosure. It ships with three auxiliary switches HQ as standard, and includes a communication function for integration into a higher-level monitoring system — useful for remote trip indication or energy metering without an add-on module.