What the ratings mean for fit
The Siemens SENTRON 3VA2463-6KP32-0JC0 is a 3-pole molded case circuit breaker rated for line protection, carrying 630 A continuous at 40 °C ambient — the thermal current that governs the main bus or feeder it protects. The ETU850 electronic trip unit allows adjustable long-time, short-time, instantaneous, and ground-fault protection curves, so selectivity coordination downstream is programmable rather than fixed. Breaking capacity reaches 242 kA at 240 V, dropping to 187 kA at 415 V and 440 V, then 121 kA at 500 V, and 40 kA at 690 V — this tells you the available fault current the breaker can safely interrupt at each system voltage without upstream cascading.
Thermal derating and ambient limits
The continuous current rating is temperature-dependent: 630 A at 40 °C, 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 the panel ambient runs above 40 °C, the breaker must be derated accordingly — a 50 °C enclosure knocks 60 A off the headline figure. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Dimensions and panel integration
The breaker measures 248 mm high, 138 mm wide, and 110 mm deep. It mounts on a DIN rail or directly to a backplate via the standard 3VA mounting footprint. The 138 mm width is the 3-pole frame size — verify cutout and busbar spacing against the existing panel layout before ordering.