What this MCCB carries — and what it means for your panel
The Siemens SENTRON 3VA2463-8JQ42-0AA0 is a 4-pole molded case circuit breaker rated 630 A continuous at 40 °C, with an ETU560 electronic trip unit that supports adjustable N-conductor protection (OFF, 20% to 100%). Breaking capacity hits 440 kA at 240 V AC and 330 kA at 415 V AC — that is fault-current headroom for high-capacity switchboards where a lower-rated breaker would cascade upstream. At 690 V the interrupting rating drops to 52.5 kA; size the SCCR study against that number if your line runs at 690 V.
Derating and thermal budget
Rated 630 A at 40 °C ambient, but the continuous current derates linearly to 450 A at 70 °C — a 180 A swing that matters in a hot enclosure or near other high-draw gear. Maximum power loss is 162 W; factor that into the panel's thermal dissipation budget, especially if the breaker shares a compartment with drives or transformers. IP40 on the front means the breaker face is protected against tools and wires over 1 mm, but the body is not sealed — mount in a clean, dry enclosure.
Dimensions and panel fit
Footprint is 184 mm wide × 248 mm high × 110 mm deep — a 4-pole frame that needs a full-width cutout in the gland plate. The 110 mm depth fits within a standard enclosure depth.