What this MCCB is and what it does
The Siemens 3VA2063-6HN32-0AD0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels and industrial switchgear. Rated at 63 A continuous with a flat derating curve from 40 °C through 70 °C — meaning it holds full current across the typical panel ambient range without a knock-down factor. That 63 A holds at every temperature point the spec lists, so you don't lose capacity in a warm enclosure.
Interrupting capacity — what the voltage columns mean
This 3-pole MCCB delivers 242 kA interrupting capacity at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 3 kA at 690 V. That 242 kA figure at 240 V is the headline — it handles high available fault current at the low-voltage side of a step-down transformer without needing a current-limiting fuse upstream. At 690 V the rating drops to 3 kA, which is typical for a 63 A frame at that voltage; it's still adequate for most 690 V motor branch circuits where the transformer impedance limits fault current.
Panel fit and auxiliaries
Dimensions are 86 mm deep, 105 mm wide, 181 mm tall — a standard SENTRON 3VA2 frame footprint that drops into the same panel cutout as other 3VA2 breakers. Ships with three HQ auxiliary switches pre-installed, so you get remote status indication without ordering add-on modules separately. Rated insulation voltage is 800 V, which covers 480/277 V and 600 V systems with margin. Power loss is 5.4 W maximum — negligible for enclosure thermal calculations but worth noting if you're packing a high-density row.