What this MCCB carries — and what it doesn't
The Siemens 3VA2110-7MS32-0KH0 is a 3-pole SENTRON molded case circuit breaker (MCCB) built for starter protection — meaning it's sized to sit ahead of a motor starter or a group of motor loads, with a trip curve tuned for that duty. Continuous current rating is 100 A flat across the full ambient range from 40 °C to 70 °C, so no derating headache when the panel runs hot. The adjustable thermal-magnetic trip unit covers 300 A to 1 500 A, which sets the short-circuit and overload pickup; you dial it in for the connected load, not the breaker's own frame. Breaking capacity hits 330 kA at 240 V, 242 kA at 415 V, and still 187 kA at 500 V — only drops to 3.7 kA at 690 V, which is typical for this frame class. That's a high-interrupting rating for a 100 A frame; it handles fault currents from a large transformer without needing a current-limiting fuse upstream.
Panel fit and auxiliaries
Footprint is 105 mm wide by 181 mm tall by 86 mm deep — a standard 3-pole MCCB envelope that fits most DIN-rail or panel-mount backplates without a sub-plate adapter. The auxiliary switch block comes preconfigured as 2 auxiliary switches plus 1 trip alarm switch (HQ designation), and the shunt trip (STL) is built in. That means you get remote trip capability and status feedback without ordering separate add-on modules. No undervoltage release, no ground-fault monitoring, no communication module on this variant — it's a straightforward thermal-magnetic breaker with shunt trip, intended for hardwired control circuits. Power loss is 10 W max, negligible for enclosure heat budgeting.