What this 630 A MCCB delivers
The Siemens SENTRON 3VA2463-7HN32-0HA0 is a 3-pole molded case circuit breaker rated for 630 A continuous current (Iu) with an ETU350 electronic trip unit. It's built for line protection in industrial distribution — think main feeders, large motor control centers, or transformer secondary protection where you need adjustable long-time, short-time, instantaneous, and ground-fault curves. The interrupting capacity hits 330 kA at 240 V and still holds 242 kA at 415/440 V, so it handles high-fault utility feeds without cascading upstream. This is the version with a factory-integrated shunt trip (STL) release — the auxiliary trip module is the 3VA9688-0BL30. That means you can remotely trip the breaker via a control signal, which is standard for emergency-stop circuits or interlocking schemes. No undervoltage release, no auxiliary contacts, no communication module on this variant; it's a clean power path with remote-trip capability only.
Thermal derating and real-world fit
The 630 A rating holds at 40 °C ambient. Above that, the breaker derates linearly: 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 — say a non-climate-controlled switchroom in summer — size the upstream transformer or busway to the derated figure, not the nameplate 630 A. The maximum power loss is 162 W, which matters for enclosure ventilation calcs. Dimensions are 248 mm high, 138 mm wide, 110 mm deep. That's a standard SENTRON 3VA2 frame footprint — it bolts into the same mounting pattern as other 3VA2 breakers in this current class. Rated insulation voltage is 800 V, so it's comfortable on 690 V systems with margin.
Trip unit and release details
The ETU350 is an electronic overcurrent release with LSI protection curves (long-time, short-time, instantaneous). It's adjustable, which gives you coordination flexibility downstream. The shunt trip (STL) is a voltage-trigger release — apply rated control voltage and the breaker opens. No undervoltage release on this variant, so if you need UVR for undervoltage protection, you'd spec a different suffix. The breaker does not include a trip indicator, auxiliary contacts, or ground-fault monitoring.