What this MCCB is and what it does
The Siemens 3VA2010-5JQ32-0AF0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a full-scale rating of 100 A and holds that rating flat from 40 °C all the way up to 70 °C — no derating curve to chase in a hot enclosure. The 3-pole breaker is rated for a maximum of 1 200 A and a minimum of 150 A, so the 100 A setting sits well within its adjustment range. Breaking capacity is the headline number for an MCCB, and this one delivers 187 kA at 240 V, dropping to 121 kA at both 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 massive fault at the service entrance without upstream coordination headaches — it's sized for high-available-fault-current installations.
Panel fit and integration
Dimensions are 181 mm tall by 105 mm wide by 86 mm deep — that 105 mm width is three 35 mm DIN-rail modules side by side, so it occupies three full positions on the rail. The 86 mm depth means it clears a standard 200 mm deep enclosure with room for wiring gutters. If you're swapping into an existing panel, check the gland-plate cutout and the bus-bar spacing: the 3-pole footprint is fixed, but the 105 mm width is wider than some compact MCCBs. Power loss is rated at 13.5 W maximum — that's the heat it dumps into the enclosure at full rated current. For a multi-breaker panel, sum those losses to size the ventilation or forced-air cooling.
Communication and auxiliary switching
The breaker includes a communication function, so it can integrate with a building management system or remote monitoring setup — no separate communication module required for basic status. It also ships with a 1 auxiliary switch + 1 trip alarm switch HQ, giving you one set of contacts for breaker position and one for trip indication. That's enough for a remote fault annunciation and a status light on the panel door without adding accessories. There's no undervoltage release and no voltage trigger on this variant, so if you need a shunt trip or UVR for emergency-stop or undervoltage protection, you'll need to order a different suffix or add an external module. The trip indicator is present, so you get a visual flag when the breaker has tripped on fault.