630 A MCCB with 330 kA breaking capacity
The Siemens 3VA2463-7HN32-0AB0 is a SENTRON molded case circuit breaker rated for 630 A continuous at 40 °C, with a maximum breaking capacity of 330 kA at 240 V and 242 kA at 415 V. That 330 kA figure at 240 V is the headline — it handles very high fault currents typical of large transformer-fed or generator-backed installations, so it's sized for main feeder or high-fault busway protection where downstream breakers need a fully rated upstream device for selectivity. The 630 A frame is derated across temperature: at 50 °C it carries 593 A, at 60 °C 557 A, and at 70 °C 520 A — the thermal curve matters if the breaker sits in a warm enclosure or near other heat sources. It's a 3-pole line-protection design (no undervoltage release, no ground-fault monitoring, no communication function) with two HP auxiliary switches built in. The 110 mm depth and 138 mm width fit standard panel-mounting cutouts for this frame class; the 248 mm height is typical for a 630 A MCCB. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C, with a maximum power loss of 162 W at rated load — that loss figure should be factored into enclosure thermal calculations.
Breaking capacity across voltages
The interrupting ratings drop as voltage rises: 330 kA at 240 V, 242 kA at both 415 V and 440 V, 187 kA at 500 V, and 9 kA at 690 V. The sharp drop at 690 V is typical for a 630 A frame — the arc energy at that voltage limits the interruption capability, so if your system runs at 690 V, verify that 9 kA covers the available fault current. For 400/415 V distribution, 242 kA is very high — it covers nearly any industrial transformer secondary.