The Siemens SENTRON 3VA2463-7HN32-0CH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 630 A at 40 °C. It's built around the ETU350 electronic trip unit — that's the brains behind the selective coordination and adjustable overload/short-circuit protection curves. The 330 kA breaking capacity at 240 V means this breaker can safely interrupt fault currents up to that level without upstream devices needing to clear the fault; at 415 V it still holds 242 kA. That's a high-interrupting rating suited for transformer secondaries or large bus feeds where available fault current is substantial. The 630 A rating is the current at 40 °C ambient. Above that, the breaker must be derated: at 50 °C it carries 593 A, at 60 °C it drops to 557 A, and at 70 °C it's down to 520 A. If you're panel-building for a 50 °C environment, size the upstream conductors and downstream bus for the derated figure, not the 40 °C nameplate. This MCCB includes an undervoltage release (UVR) as the auxiliary release type, plus 2 auxiliary switches and 1 trip alarm switch (HQ configuration). The UVR will trip the breaker if the control voltage drops below its dropout threshold — common for emergency-stop circuits or undervoltage protection on motor feeds. The trip alarm switch signals the breaker's open state due to a fault, not just manual switching. The integrated auxiliary trip is order code 3VA9608-0BB24; the supplied basic switch is 3VA2463-7HN32-0AA0. These are the internal components that the panel builder or maintenance team would reference when ordering spare aux blocks or replacement trip units.
Breaking capacity across voltages
The 330 kA at 240 V is the headline number, but the real-world value is often the 242 kA at 415 V — that's the common industrial distribution voltage in many markets. At 500 V it drops to 187 kA, and at 690 V it's 52.5 kA. If your system's available fault current at the breaker's line terminals is, say, 200 kA at 500 V, this breaker still holds margin. For a 690 V wind-turbine or mining application, the 52.5 kA rating is the limit to check against the transformer impedance and cable length.
Panel integration and mounting
Dimensions are 248 mm high, 138 mm wide, and 110 mm deep. This is a fixed-mount MCCB — no draw-out cradle. The 138 mm width is three-pole wide, standard for this frame size. Verify the panel cutout or mounting plate spacing against the 110 mm depth, especially if the breaker is mounted near the back panel where busbars or cable ducts run behind it. The maximum power loss of 164.5 W means the enclosure needs enough free-air volume or forced ventilation to keep internal ambient below the 70 °C operating maximum.