What the ratings mean for fit
The Siemens SENTRON 3VA2463-7HM32-0AA0 is a 3-pole molded case circuit breaker rated for 630 A continuous at 40 °C, with an interrupting capacity of 330 kA at 240 V and 242 kA at 415 V. That 330 kA figure at 240 V means it can safely clear a fault current up to that level without the arc flashing over or the case rupturing — critical for high-fault installations like transformer secondaries or large motor control centers. At 690 V the interrupting rating drops to 9 kA, so this breaker is not suited for 690 V distribution unless the available fault current is known to be under that threshold. The continuous current derates with ambient temperature: 630 A at 40 °C, 612 A at 45 °C, 593 A at 50 °C, 575 A at 55 °C, 557 A at 60 °C, 538 A at 65 °C, and 520 A at 70 °C. If the panel ambient runs above 40 °C, the actual load must be reduced accordingly — a 630 A pump motor in a 50 °C enclosure would need the 593 A derated limit, not the nameplate 630 A. Designed for line protection, this MCCB includes ground-fault monitoring via summation current formation on the L-conductor. That means it detects residual current by summing the phase currents — useful for equipment protection in grounded systems, though it is not a personnel-protection GFCI. No undervoltage release, no communication function, and no trip indicator are fitted on this variant.
Integration and mounting
Breaker measures 138 mm wide by 248 mm high by 110 mm deep. The 138 mm width occupies three pole spaces on a DIN rail or bolted bus. Maximum power loss is 162 W at rated current. That heat must be considered in the enclosure thermal calculation — a sealed cabinet with no forced ventilation will need to be sized to dissipate that loss without exceeding the 70 °C maximum operating temperature.