The Siemens SENTRON 3VA2463-5JP32-0JL0 is a 3-pole molded case circuit breaker (MCCB) rated for 630 A continuous current, built around the ETU550 electronic trip unit. This is the line-protection variant — meaning it's sized and coordinated for feeder circuits, not motor-starting duty. The 187 kA breaking capacity at 240 V gives serious SCCR headroom for high-fault installations like transformer secondaries or main switchboards.
Breaking capacity across voltages
The interrupting rating drops predictably as voltage rises: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 17 kA at 690 V. For a 400 V panel, 121 kA covers most utility-fault scenarios without cascading upstream. At 690 V the 17 kA figure still clears a substantial fault, but verify it against your transformer's nameplate impedance — if the available fault current exceeds that, you need a current-limiting upstream device.
Thermal derating and panel fit
The 630 A rating holds at 40 °C ambient. At 50 °C it derates to 570 A; at 60 °C to 510 A; at 70 °C to 450 A. Mounting in a sealed, non-ventilated enclosure pushes internal ambient up — check the actual cabinet temperature against this curve before locking in the BOM line. Physical footprint is 138 mm wide × 248 mm high × 110 mm deep, which fits standard SENTRON mounting patterns; no panel rework needed if replacing an existing 3VA2 frame.
Trip unit and auxiliary complement
The ETU550 electronic trip unit provides adjustable long-time, short-time, instantaneous, and ground-fault protection curves — it's the mid-tier electronic release in the 3VA family, offering more selectivity than a thermal-magnetic but without the full communications suite of the ETU600. The breaker ships with a shunt trip (STL) auxiliary release and a full auxiliary contact block: 2 auxiliary switches + 1 trip alarm switch + 1 electrical alarm switch HQ. That's enough for remote status and trip indication without adding a separate module. Power loss at rated load is 162 W max — factor that into enclosure thermal calculations.