The Siemens SENTRON 3VA1063-2ED36-0DH0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a continuous current rating of 63 A at 40 °C, derating to 58 A at 70 °C, so the thermal curve is worth checking if the panel ambient runs hot. Breaking capacity runs from 52.5 kA at 240 V down to 7.5 kA at 690 V, which gives selectivity headroom for most industrial service-entrance or sub-feed applications.
Fit and ratings
Rated insulation voltage is 800 V, so it's comfortable on 480/277 V or 600 V systems with margin. The 63 A frame at 40 °C holds flat to 50 °C, then drops 1 A per 5 °C step — useful to know if the breaker lives in a non-conditioned enclosure. Power loss at full load is 19.8 W, which adds to the thermal budget inside a closed panel. This variant ships with an undervoltage release (UVR) and a factory-fitted auxiliary switch block carrying 2 auxiliary contacts plus 1 trip-alarm switch (HQ). The UVR means the breaker drops out on loss of control voltage — standard for safety circuits where a downstream contactor or PLC must not re-energise without deliberate reset. No ground-fault monitoring, no communication module; this is a straightforward line-protection MCCB with no Modbus or PROFIBUS onboard.
Panel fit
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — standard 3-pole MCCB footprint for the 3VA frame. Mounts on a DIN rail or directly to a backplate via the screw terminals. The auxiliary switch block and UVR are pre-assembled, so no field-stacking of accessories; the wiring diagram stays clean.