The Siemens SENTRON 3VA2463-6HN32-0DL0 is a 3-pole molded case circuit breaker (MCCB) rated for 630 A continuous at 40 °C, with a breaking capacity of 242 kA at 240 V AC and 187 kA at 415 V AC. The 630 A frame is designed for line protection, so it's the primary overcurrent device on a feeder, not a branch breaker. It carries an undervoltage release (UVR) as standard, which drops the trip mechanism if control voltage falls below the dropout threshold — useful for coordinated shutdown sequences or safety circuits that need a loss-of-voltage trip.
Thermal derating — don't size by the 40 °C number alone
In a warm enclosure — say 50 °C — the continuous current drops to 593 A; at 60 °C it's 557 A; at 70 °C it's 520 A. The maximum power loss is 164.5 W, which contributes to the enclosure heat load — account for it in your thermal calculation.
Auxiliary switch complement and release configuration
The UVR is a separate release coil; if your control scheme doesn't need a loss-of-voltage trip, the 3VA2463-6HN32-0AA0 base switch (without the UVR) is the same frame without that release. The auxiliary switch design is factory-configured; field-add-on modules are possible but verify the slot count against the installed complement.
That depth is the body only — add clearance for the handle throw and rear terminals. The 138 mm width is a 3-pole frame; a 4-pole version would be wider. Mounting is via the rear panel or a DIN-rail adapter; the SENTRON 3VA series uses a common footprint for the frame size, so a panel cutout for a 630 A 3VA breaker should accept this unit without re-drilling if the mounting pattern matches.