What it is and what it does
The Siemens 3VA2110-7MS32-0AH0 is a SENTRON molded case circuit breaker (MCCB) with a starter protection design, meaning it is built to protect motor circuits against short circuits and overloads, not just as a simple distribution breaker. It carries a continuous current rating of 100 A across the full ambient temperature range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel thermal calculations. The 3-pole unit delivers a short-circuit breaking capacity of 330 kA at 240 V, dropping to 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. That 330 kA figure at 240 V puts it in the high-interrupting category for industrial motor branch circuits where available fault current is severe.
Integration and mounting
The breaker measures 105 mm wide, 181 mm high, and 86 mm deep — a standard SENTRON 3VA footprint that fits existing panel cutouts and busbar systems for this frame size. It ships with a factory-installed auxiliary switch block: 2 auxiliary switches plus 1 trip alarm switch (HQ type), so you get both position indication and a separate alarm contact on trip without adding a module. The undervoltage release is absent (no voltage trigger), and there is no ground-fault monitoring version, no communication function, and no phase failure detection — this is a straightforward thermal-magnetic motor protector, not a smart breaker. Power loss is rated at a maximum of 10 W, which is modest for a 100 A frame and helps keep enclosure internal temperature rise manageable.