What this MCCB is and what it does
The Siemens 3VA2010-5HN32-0HC0 is a SENTRON molded case circuit breaker (MCCB) rated for 100 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to 70 °C. It's a 3-pole unit designed for line protection, meaning it sits on the feeder side of a panel to protect cables and busbars against short circuits and overloads. The interrupting ratings are serious: 187 kA at 240 V, 121 kA at 415/440 V, 75.6 kA at 500 V, and 3 kA at 690 V. That 187 kA figure at 240 V tells you this breaker is built for high-fault locations — think transformer secondaries or large motor control centers where available fault current is well above what a standard 65 kA MCCB could handle.
Built-in accessories and panel fit
This MCCB comes factory-fitted with a shunt trip (STL) release and two HQ auxiliary switches — no field assembly required. The shunt trip lets you remotely trip the breaker from a PLC or emergency-stop circuit, which is standard for safety disconnects in automated lines. The auxiliary switches report the breaker's open/closed status back to the control system. Dimensions are 105 mm wide, 181 mm high, 86 mm deep — it mounts on a DIN rail or panel-mount plate inside a standard distribution board. Power loss is 13.5 W maximum, so factor that into enclosure thermal calculations if you're packing multiple breakers in a sealed cabinet.