What this 630 A MCCB delivers — and where the ratings matter
The Siemens SENTRON 3VA2463-5JQ32-0KA0 is a 3-pole molded case circuit breaker (MCCB) rated 630 A at 40 °C, designed for line protection in distribution panels and switchgear. What sets this variant apart is the integrated shunt trip (STL) and communication function, making it suitable for remote-trip and monitored feeders where you need coordinated protection with a PLC or BMS. Breaking capacity is the headline: 187 kA at 240 V AC, 121 kA at 415/440 V, 75.6 kA at 500 V, and 9 kA at 690 V. That 187 kA figure at 240 V means it handles high-fault scenarios near transformers or in large industrial services without cascading upstream — a key spec for selectivity studies. At 690 V the 9 kA rating is still adequate for most motor control center applications, but confirm the available fault current if feeding a 690 V drive bank. The I²t let-through range is 945 A to 5,670 A, which governs how much energy passes during a fault — lower values for better downstream coordination on branch circuits. The breaker ships with a shunt trip (STL) auxiliary release; no auxiliary switch is fitted as standard, so if you need a position feedback contact, order the 3VA2463-5JQ32-0AA0 basic switch variant separately or spec the auxiliary switch module.
Thermal derating — the real-world current you can carry
The 630 A rating is at 40 °C ambient inside the enclosure. At 45 °C it drops 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; at 70 °C to 450 A. If your panel runs hot — say a crowded MCC lineup with heat rise — use the 60 °C column (510 A) for sizing. The max power loss is 162 W, which must be dissipated through the enclosure; factor that into your thermal budget.
Panel fit and dimensions
Dimensions: 248 mm high, 138 mm wide, 110 mm deep. The 138 mm width is standard for a 3-pole MCCB in the 630 A frame class — it fits a 3-module cutout in most switchgear. Depth of 110 mm leaves clearance for rear-connected busbars or cable lugs. Operating temperature range is -25 °C to +70 °C; storage from -40 °C to +80 °C.