630 A MCCB for Line Protection — What the Ratings Mean
The Siemens 3VA2463-5JP32-0JH0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for 630 A continuous current at 40 °C ambient — the number that governs your conductor and busbar sizing for the main feeder or large downstream distribution. That 630 A is the maximum uninterrupted current the breaker can carry without tripping under normal conditions; at higher ambient temperatures the rating derates linearly to 450 A at 70 °C, so panel placement and ventilation matter for full utilization. Breaking capacity hits 121 kA at 415 V and 187 kA at 240 V — those are the fault currents the breaker can safely interrupt without welding contacts or rupturing the case. For a 480 V wye service (277/480 V) the relevant figure is the 121 kA at 440 V, which gives substantial SCCR headroom for most industrial and data-center switchboards. At 690 V it still clears 9 kA, enough for some European 690 V distribution. This is a line-protection design — meaning it trips on overload and short-circuit to protect the cable, not a motor or generator directly. The adjustable thermal-magnetic or electronic trip unit (the basic switch is 3VA2463-5JP32-0AA0) lets you set the long-time pickup between 945 A minimum and 5 670 A maximum, covering a wide range of feeder sizes.
Panel Fit and Communication
Dimensions are 248 mm high × 138 mm wide × 110 mm deep — a standard MCCB footprint for 630 A frames, meaning it will drop into most existing SENTRON mounting plates or panel cutouts without re-drilling. The 138 mm width per 3-pole unit is the critical dimension for multi-breaker lineup spacing. The breaker includes a communication function for remote trip indication, current metering, and parameter adjustment. Auxiliary switch configuration includes 2 auxiliary switches plus 1 trip alarm switch (HQ), and a shunt trip (STL) release is built in — that covers remote tripping and status feedback for a safety circuit or emergency-off chain. No undervoltage release is fitted as standard.
Production Status and Compliance
Maximum power loss is 162 W at rated current — factor that into your panel cooling calculation, especially if the breaker is enclosed in a low-ventilation switchboard with other heat sources.