63 A MCCB with 187 kA interrupting capacity at 240 V
The Siemens SENTRON 3VA2063-5HN36-0AH0 is a 3-pole molded case circuit breaker rated for 63 A continuous current across the full ambient range from 40 °C to 70 °C, with no derating needed up to that ceiling. The 187 kA interrupting rating at 240 V gives substantial fault-clearing headroom for high-available-fault-current service-entrance or distribution panels where the utility transformer sits close. At 415 V and 440 V it still breaks 121 kA; at 500 V it holds 75.6 kA, and at 690 V the rating drops to 3 kA — so this is a line-protection device sized for low-voltage main or feeder duty, not for 690 V motor circuits. The design is line protection (not motor or generator protection), meaning the trip curve and accessories are optimized for cable and busbar protection in distribution. The 105 mm width and 86 mm depth fit standard SENTRON panel cutouts; the 181 mm height is the same envelope as other 3VA2 frame sizes, so a panel laid out for the family accepts this unit without re-spacing the DIN rail or busbar positions.
Auxiliary switching and trip indication
Factory-fitted with 2 auxiliary switches plus 1 trip alarm switch (HQ designation), so status feedback and remote trip indication are available without wiring an add-on module. The basic switch inside is order code 3VA20635HN360AA0. Power loss at rated load runs 5.4 W maximum — negligible for thermal budgeting inside a sealed enclosure, but worth noting if the panel packs many breakers in a small volume. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C. Insulation voltage rated at 800 V. No undervoltage release, no ground-fault monitoring, and no communication function on this variant — it is a straight electromechanical breaker with auxiliary contacts only.