What the ratings mean for fit
The Siemens SENTRON 3VA2463-5JQ32-0BA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, with a full-scale current of 630 A. The headline interrupting ratings are 187 kA at 240 V, 121 kA at 415 V and at 440 V, 75.6 kA at 500 V, and 9 kA at 690 V — those numbers govern whether the breaker clears a fault without rupturing at the available short-circuit current on your system. Per the datasheet, the continuous current derates with ambient temperature: 630 A at 40 °C, 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 your panel ambient runs above 40 °C, the actual load must be sized to the derated value, not the nameplate 630 A. The breaker includes an undervoltage release (UVR) as the auxiliary release type — no auxiliary switch is fitted. A communication function is present, and the trip indicator is not fitted. The initial value of the adjustable overload protection is 126 A, with a full-scale setting of 630 A. The design is line protection, meaning it is intended for feeder or main breaker duty, not motor branch-circuit protection (which would require a different trip curve).
Integration and mounting
Dimensions are 248 mm height, 138 mm width, and 110 mm depth. The MCCB is designed for panel mounting — typically bolted to a backplate or mounted on a DIN rail adapter (not included). The 110 mm depth is the body depth; allow clearance for the undervoltage release coil and any communication module wiring. The operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 164.5 W — factor that into your enclosure thermal budget.