What this MCCB is and what it does
The Siemens 3VA2110-7MN32-0JH0 is a SENTRON molded case circuit breaker (MCCB) designed specifically for motor protection, carrying 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. Rated for 3-pole operation, it integrates a shunt trip (STL) auxiliary release and comes factory-fitted with two auxiliary switches plus one trip alarm switch (HQ configuration), giving the control system direct feedback on breaker state and fault events. The interrupting capacity reaches 330 kA at 240 V, 242 kA at 415/440 V, 187 kA at 500 V, and 3.7 kA at 690 V — figures that place it in the high-fault-current class for industrial distribution, suitable for transformer-secondaries and large motor branch circuits where fault levels are substantial.
Motor protection and trip features
Phase failure detection is built in, and the breaker includes a voltage trigger and trip indicator — so when a phase drops or a fault occurs, the MCCB trips and the indicator confirms it visually on the front face. The trip delay range spans 4 s minimum to 17 s maximum, which allows coordination with downstream motor starters and upstream feeders in a selective scheme — the short delay clears faults fast, the longer band rides through inrush without nuisance tripping. Maximum power loss is 10 W, a figure worth noting for thermal budgeting inside a sealed or tightly packed enclosure.
Mounting and integration
The 3VA2110-7MN32-0JH0 measures 181 mm high, 105 mm wide, and 86 mm deep — a 3-pole frame that fits standard SENTRON mounting footprints and accepts busbar or cable connections on both line and load sides. Operating temperature range is -25 °C to 70 °C, with storage from -40 °C to 80 °C, so it handles both cold warehouses and warm panel interiors without issue. The basic switch supplied is order code 3VA21107MN320AA0 — if you're replacing just the switching mechanism, that's the sub-assembly to source.