What this MCCB delivers on the line side
The Siemens SENTRON 3VA2063-5KQ46-0AA0 is a 4-pole molded case circuit breaker rated for 63 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. The ETU860 electronic trip unit gives you adjustable overload and short-circuit protection curves, plus ground-fault monitoring via summation current formation on the L + N conductor. Communication function is built in, so this breaker talks to your control system without an add-on module. Breaking capacity is the headline: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3 kA at 690 V. That 187 kA figure at 240 V means this breaker handles the full available fault current on a large low-voltage transformer secondary without needing a current-limiting upstream device — it's sized for high-fault panels where standard 65 kA or 100 kA breakers would be coordination-limited. Rated insulation voltage is 800 V, and the front face carries IP40 protection — fine for a clean indoor panel, but not for washdown zones. The 5.4 W maximum power loss is low enough that you can pack several of these in a row without thermal worry.
Panel fit and integration
Dimensions: 181 mm high, 140 mm wide, 86 mm deep. That 86 mm depth is the body only — account for the handle throw and any optional motor drive (the listing confirms a motor drive option is available). The 140 mm width is standard for a 4-pole frame in this class; it fits the usual panel cutout and busbar spacing. Mounting is screw-fixed to the backplate, not DIN-rail, so plan for drilled and tapped holes or a mounting plate.
Compliance and documentation
The SENTRON series carries IEC 60947-2 certification for molded case circuit breakers. The reference code per IEC 81346-2 is Q. The product designation is line protection, meaning it's intended for feeder and main breaker duty, not motor circuit protection (that would be a different trip curve).