What this MCCB carries and where it fits
The Siemens SENTRON 3VA1063-4ED36-0JA0 is a 3-pole molded case circuit breaker rated for 63 A continuous current (Iu) with a TM210 thermal-magnetic overcurrent release, configured for line protection. It carries a breaking capacity of 121 kA at 240 V and 75.6 kA at 415 V, which means it can safely interrupt fault currents up to those levels without cascading upstream — critical for high-fault panels where the upstream transformer or bus can deliver that energy. The 800 V rated insulation voltage (Ui) gives headroom for 480 V and 600 V class systems. This is a line-protection device — no ground-fault monitoring, no communication module, no auxiliary contacts built in. The shunt trip (STL) is present for remote tripping; the integrated auxiliary trip order code is 3VA9688-0BL32 if you need to add that function. The front face carries IP40 protection, so it's suited for dry indoor panel environments where tools or fingers won't contact live parts through the front.
Thermal derating — what the 63 A rating actually means in a warm panel
The 63 A rating holds flat from 40 °C through 50 °C ambient. Above that, it derates: 60.48 A at 55 °C, 59.22 A at 60 °C, 57.96 A at 65 °C, and 56.7 A at 70 °C. If your panel ambient runs at 60 °C — common in a tightly packed enclosure with drives or transformers — you're effectively working with a 59 A breaker, not 63 A. Plan the load side accordingly; the TM210 release won't nuisance-trip if you stay under the derated curve.
Panel fit and mounting
Dimensions: 76.2 mm wide, 130 mm high, 70 mm deep. The 76.2 mm width is a standard 3-pole MCCB footprint — three 25.4 mm pole pitches — so it drops into the same DIN-rail or screw-mount space as other 3-pole SENTRON breakers. Depth of 70 mm leaves room for rear busbar connections in a typical 200 mm deep enclosure. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Breaking capacity across voltages — selectivity planning
The breaking capacity varies by system voltage: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. On a 480 V system (common in North America), the 440 V figure of 52.5 kA is the closest published rating — expect similar or slightly lower at 480 V. For 690 V applications, the 11.9 kA figure means this breaker is suitable only where the prospective fault current stays under that threshold. The latching endurance is rated at 15,000 operations.