What this MCCB delivers for a critical-feed panel
The Siemens SENTRON 3VA2463-6JP32-0JC0 is a 3-pole molded case circuit breaker rated for 630 A continuous at 40 °C, with an interrupting capacity of 242 kA at 240 V and 187 kA at 415 V. That SCCR headroom means it can sit upstream of a step-down transformer or a main distribution board without needing a current-limiting fuse ahead of it — a single point of failure eliminated. The adjustable thermal-magnetic trip range (945 A minimum, 5 670 A maximum) lets you coordinate downstream breakers without swapping the frame. Communication function is built in, so the breaker reports status and trip events back to the BMS or SCADA layer; no separate add-on module needed.
Derating and thermal budget — what the 40 °C rating really means
The 630 A rating is valid 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. If this breaker lives in a non-air-conditioned electrical room that hits 55 °C in summer, the real continuous capacity is 540 A — not 630 A. The maximum power loss of 162 W (at rated current) drives the heat load inside the enclosure; factor that into the panel's ventilation or cooling calcs. Operating range is -25 °C to 70 °C, storage from -40 °C to 80 °C.
Footprint and panel fit
Dimensions are 248 mm tall × 138 mm wide × 110 mm deep. That 138 mm width on a 3-pole frame is standard for this class — it occupies three 45 mm pole spaces on a DIN rail or bolted bus. The 110 mm depth (4.33 in) leaves clearance for rear-connected bus bars or a cable duct behind the breaker. No trip indicator on the front face; trip status is reported via the communication interface or the two HQ auxiliary switches.