What this 630 A MCCB delivers — and where the ratings matter
This SENTRON 3VA2463-5JQ32-0JC0 is a 3-pole molded case circuit breaker rated 630 A at 40 °C, sized for line protection in distribution panels where fault currents can hit 187 kA at 240 V or 121 kA at 415 V. The 630 A full-scale value with an initial trip threshold of 126 A means it clears low-level overloads before they escalate — the trip curve starts engaging well below the frame rating. Breaking capacity drops predictably as voltage climbs: 75.6 kA at 500 V, and 9 kA at 690 V. That 690 V figure is the ceiling — above that, coordination with upstream devices becomes critical. The thermal derating curve is what you actually spec against in a closed panel: at 50 °C it carries 570 A, at 60 °C it's 510 A, and at 70 °C it drops to 450 A. Power loss hits 162 W maximum, so factor that into your ventilation budget. No undervoltage release is fitted, so if you need UV protection that's a separate add-on. The basic switch variant is 3VA2463-5JQ32-0AA0.
The 138 mm width is a 3-pole frame. That storage minimum matters if this sits in an unheated warehouse before installation — it's fine down to -40 °C, but let it warm above -25 °C before closing the breaker under load.