What this MCCB is and what it does
The Siemens SENTRON 3VA2010-5JQ32-0KC0 is a 3-pole molded case circuit breaker (MCCB) rated for line-protection duty, sized to carry 100 A continuously across the full ambient range from 40 °C to 70 °C with no derating — that 100 A holds at every temperature step in the spec, so you don't have to recalc for a hot panel. Breaking capacity hits 187 kA at 240 VAC, dropping to 121 kA at 415 V and 440 V, then 75.6 kA at 500 V, and 3 kA at 690 V. That 187 kA at 240 V means it can safely interrupt a fault current up to 187,000 A without welding or rupturing — high enough for most service-entrance and main-feeder positions. The unit includes a communication function and a shunt trip (STL) auxiliary release, plus two HQ auxiliary switches. It's designed for line protection, not motor or generator protection, so it's the right choice for feeder and distribution circuits in a panel.
Mounting and panel fit
The 3VA2010-5JQ32-0KC0 measures 105 mm wide, 181 mm tall, and 86 mm deep. That 105 mm width is a 4-pole-width footprint on a standard DIN-rail or panel-mount base — it fills a 4-module slot (at roughly 27 mm per pole) in a SENTRON distribution board. Depth of 86 mm means it clears most standard enclosure gland plates and backpanels without needing a spacer. The 100 A rating is flat across the operating range, so no extra ventilation gap required beyond normal IEC 60947-2 clearance.
Key ratings at a glance
Rated current: 100 A continuous, no derating from 40 °C to 70 °C. Breaking capacity: 187 kA at 240 VAC, 121 kA at 415 VAC and 440 VAC, 75.6 kA at 500 VAC, 3 kA at 690 VAC. Poles: 3. Auxiliary switches: 2 HQ. Auxiliary release: shunt trip (STL). Communication function: yes. Power loss: 13.5 W maximum. Operating temperature: -25 °C to 70 °C. Storage temperature: -40 °C to 80 °C.