630 A MCCB with ETU320 — what the ratings mean for your panel
The Siemens 3VA2463-5HL32-0JA0 is a SENTRON 3VA2 molded case circuit breaker rated for 630 A continuous current (Iu) in a 3-pole configuration, configured for line protection with an ETU320 electronic overcurrent release and an integrated shunt trip (STL) release. That 630 A rating is at 40 °C ambient; the breaker thermally derates to 520 A at 70 °C, so the actual continuous current your bus can carry depends on enclosure temperature — plan your panel ventilation around the 162 W maximum power loss this unit dissipates at full load. Breaking capacity is 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 17 kA at 690 V — these are the fault currents the breaker can safely interrupt at each voltage level, which governs your SCCR coordination upstream. The ETU320 release handles adjustable long-time, short-time, and instantaneous protection curves; the shunt trip (STL) allows remote tripping via a control signal, useful for emergency-stop circuits or load-shedding schemes.
Physical fit and panel integration
Dimensions are 248 mm high, 138 mm wide, 110 mm deep — this is a full-frame 3VA2 breaker sized for 630 A buswork, not a compact frame. Verify your enclosure depth clears 110 mm plus wiring space for the line and load lugs. Rated insulation voltage Ui is 800 V, so it's suitable for 480/600 VAC systems with margin. Operating temperature range is -25 °C to +70 °C; storage range is -40 °C to +80 °C.