What this MCCB is and what it does
The Siemens 3VA2110-7MN36-0KH0 is a SENTRON molded case circuit breaker (MCCB) built for motor protection. It carries a flat 100 A rating across the full operating range from 40 °C to 70 °C — no derating curve to chase as the panel warms up. That's 100 A at 40 °C, 45 °C, 50 °C, 55 °C, 60 °C, 65 °C, and 70 °C, all the same. Three poles, with phase failure detection built in, so it catches a lost phase before the motor cooks. Breaking capacity is 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 3.7 kA at 690 V. That 330 kA at 240 V tells you this breaker is sized for high-fault industrial panels — not a branch-circuit light-duty MCCB. The trip delay is adjustable between 4 s and 17 s, which gives you room to coordinate with downstream motor starters and avoid nuisance trips on inrush.
Panel fit and auxiliary wiring
Footprint is 105 mm wide, 181 mm tall, 86 mm deep. That 105 mm width is three-pole standard for the 3VA frame — it'll drop into the same DIN-rail or panel-mount cutout as other 3VA2100 breakers. Comes with a shunt trip release (STL) and an auxiliary switch block: 2 auxiliary switches plus 1 trip alarm switch. The basic switch assembly is order code 3VA21107MN360AA0, which is the internal switching mechanism; you're buying the complete breaker here, not a kit. Max power loss is 10 W — that's the heat to vent in the enclosure. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Trip indicator and voltage trigger are both present, so you get a local mechanical flag and a remote signal that the breaker has opened on fault.