What this 630 A MCCB does for the line
The Siemens SENTRON 3VA2463-6HN32-0KH0 is a 3-pole molded case circuit breaker rated for 630 A continuous current, built for line protection in distribution panels. Its interrupting capacity hits 242 kA at 240 V, 187 kA at 415 V, and still holds 121 kA at 500 V — numbers that matter when you're protecting a feeder feeding a whole motor control center or a big pump bank. At 690 V it's still good for 9 kA, so it handles mixed-voltage panels without a second breaker. Thermal derating is baked in: 630 A at 40 °C, 612 A at 45 °C, 593 A at 50 °C, and so on down to 520 A at 70 °C. If your panel runs hot — and most do out here in the grease — you size off the 50 °C or 60 °C column, not the 40 °C sticker. Power loss maxes out at 162 W, so plan ventilation if you're packing a row of these.
Panel fit and dimensions
The breaker measures 248 mm high, 138 mm wide, and 110 mm deep. That depth — 110 mm — is the key number for shallow enclosures or when you're stacking breakers behind a gland plate. Width of 138 mm means it occupies three pole spaces on a standard DIN rail or bolted bus. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C.