What the ratings mean for fit
The Siemens SENTRON 3VA2463-5HN32-0HC0 is a 3-pole molded case circuit breaker rated for 630 A continuous current at 40 °C, with a maximum breaking capacity of 187 kA at 240 V AC. That 187 kA figure drops to 121 kA at 415 V and 440 V, then to 75.6 kA at 500 V, and 9 kA at 690 V — so the interrupting rating is voltage-dependent, and the 240 V value is the headline for high-fault applications like transformer secondaries or large motor control centers fed close to the utility service entrance. The continuous current derates with ambient temperature: 612 A at 45 °C, 593 A at 50 °C, down to 520 A at 70 °C. If the panel ambient runs above 40 °C, the actual ampacity is the derated figure, not the 630 A nameplate. The breaker is designed for line protection (not motor or generator protection), meaning its trip curve and accessories are set up for feeder and main applications. It ships with a shunt trip (STL) release and two HQ auxiliary switches — useful for remote tripping and status feedback in a PLC or SCADA system. No undervoltage release, no ground-fault monitoring, and no communication function are included on this variant.
Sourcing and lifecycle
Maximum power loss is 162 W at rated load — factor that into the panel thermal budget if the breaker is enclosed in a low-ventilation cabinet alongside other heat sources. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage limit governs handling and warehousing, not running conditions.