63 A MCCB with ETU860 — no derating across the operating band
The Siemens SENTRON 3VA2163-8KQ42-0AA0 is a 4-pole molded case circuit breaker rated for 63 A continuous current, and it holds that rating flat from 40 °C all the way up to 70 °C — no derating curve to calculate for warm panel environments. Breaking capacity hits 440 kA at 240 V, 330 kA at 415 V, 220 kA at 500 V, and still 53 kA at 690 V — meaning this breaker can sit on the main feeder of a high-fault industrial distribution board without cascading upstream. The ETU860 electronic trip unit gives adjustable N-conductor protection (OFF, 40 % to 160 % of phase rating) and configurable short-time delay tr from 0.5 s to 25 s, so it coordinates selectively with downstream breakers on a motor control center or lighting panel.
Panel fit and environmental limits
Mounts on a DIN rail or direct panel; the 140 mm width and 86 mm depth fit standard SENTRON 4-pole cutouts — no special adapter plate for retrofit into an existing Siemens switchboard. IP40 on the front means it is protected against tools and wires larger than 1 mm — standard for indoor distribution boards; not rated for washdown or outdoor exposure without an enclosure. Rated insulation voltage is 800 V, so it handles 690 V line-to-line systems with margin; operating temperature range from -40 °C to 70 °C covers both cold warehouses and hot transformer rooms.
Lifecycle and compliance
The 3VA2163-8KQ42-0AA0 carries a reference code per DIN EN 81346-2 (Q for switching devices), which simplifies documentation in structured plant naming systems. Communication function is built in — the ETU860 supports Modbus RTU via the optional COM module for power monitoring and remote trip indication.