What this MCCB is and what it protects
The Siemens 3VA2010-5HN32-0KH0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection — meaning it sits at the feeder or main distribution point, not on a specific motor or load. It carries a continuous current rating of 100 A across the full ambient range from 40 °C to 70 °C, so no derating curve to chase when the panel runs hot. The 3-pole frame handles three-phase circuits up to 690 V, with interrupting ratings that step down from 187 kA at 240 V to 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 busway feeds where available fault current is serious.
Physical fit and panel integration
Dimensions: 105 mm wide, 181 mm tall, 86 mm deep. That 105 mm width is a 3-pole MCCB standard — it occupies three 35 mm DIN-rail modules worth of panel width. The 86 mm depth means it clears most 200 mm deep enclosures with room for wiring gutters. The shunt trip (STL) release and the 2 auxiliary switches plus 1 trip alarm switch (HQ) are factory-fitted, so no field-assembly of accessories. The undervoltage release is not present on this variant. The trip indicator and voltage trigger are built in. Mounting is screw-clamp to the DIN rail or direct panel mount via the breaker's base. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C. Max power loss is 13.5 W — negligible for enclosure thermal calculations but worth noting if you're packing multiple breakers in a small box.