Rated current and interrupting capacity — what they mean for your panel
The Siemens SENTRON 3VA1063-3ED42-0KC0 is a 4-pole molded case circuit breaker (MCCB) rated 63 A continuous at 40 °C ambient, with no derating needed up to 50 °C — it holds 63 A through that range, then drops to 62 A at 55 °C and 58 A at 70 °C. That thermal curve means the breaker can sit in a warm enclosure without losing headroom, as long as the ambient stays under 50 °C. The interrupting rating is 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V, which covers most low-voltage distribution fault levels in North American and IEC panels. At 500 V and 690 V the rating settles to 7.5 kA, so verify the available fault current on 480 V or 600 V systems before specifying.
Dimensions and panel fit
The breaker measures 70 mm deep, 101.6 mm wide, and 130 mm tall. That 70 mm depth is the dimension from the mounting surface to the front of the breaker — critical when planning gland-plate clearance or door clearance in a shallow enclosure. The 101.6 mm width (4 inches) is the standard footprint for a 4-pole MCCB in the SENTRON 3VA family, so it drops into the same DIN-rail or screw-mount slot as other 4-pole 3VA units without re-drilling the backplate.
Auxiliary release and internal configuration
This variant includes a shunt trip release (STL) for remote tripping, plus two auxiliary switches (HQ) for status feedback to a PLC or annunciator. The design is line protection (not motor protection), so it is sized for feeder or branch-circuit protection in distribution panels. Rated insulation voltage is 800 V, and the maximum power loss is 17.3 W — a figure to include in enclosure thermal calculations if the panel is densely packed.