What the ratings mean for your panel
The Siemens SENTRON 3VA2463-5HN32-0AJ0 is a 3-pole molded case circuit breaker rated for a continuous current of 630 A at 40 °C, with the ETU350 electronic trip unit handling overcurrent protection. At 240 V it interrupts 187 kA; at 415 V and 440 V that drops to 121 kA, then 75.6 kA at 500 V, and 17 kA at 690 V — so the SCCR you need for your transformer secondary or main feeder determines the voltage tap you spec against. The 630 A frame is the headline, but the real working current derates with ambient: 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 your panel runs hot near the top of the enclosure, plan for that curve rather than the 40 °C number. This is a line protection version — no undervoltage release, no ground fault monitoring, no communication module, no phase failure detection. It is a straight feeder or main breaker with a trip indicator and a 2-auxiliary-switch plus 1-trip-alarm-switch HP auxiliary contact block. The front face carries IP40 protection, so it is fine inside a closed panel but not for washdown zones. Mounting dimensions: 248 mm high, 138 mm wide, 110 mm deep. The basic switch variant is 3VA2463-5HN32-0AA0; this order code adds the auxiliary contact block and trip alarm from the factory. Latching endurance is rated at 15 000 operations. Maximum power loss at rated current is 162 W — factor that into your enclosure thermal calculation if the breaker sits in a sealed compartment.