What this MCCB is and what it does
The Siemens SENTRON 3VA2110-5HN32-0DH0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current, designed for line protection in industrial distribution panels. Its 187 kA breaking capacity at 240 V AC means it can safely interrupt fault currents up to that level without cascading damage upstream — critical for high-fault installations like transformer secondaries or large motor control centers. At 415 V the interrupting rating is still 121 kA, so it handles most industrial service-entrance and sub-distribution duties without needing a current-limiting fuse ahead of it.
Key ratings and what they mean for fit
Rated 100 A continuous from 40 °C through 70 °C ambient — no derating curve to chase across the operating range, which simplifies panel thermal calculations. The 86 mm depth and 105 mm width fit standard MCCB mounting footprints; the 181 mm height leaves room for auxiliary wiring above the breaker. Power loss is 12.5 W maximum, so adjacent devices in a sealed enclosure need that accounted for in the thermal budget. The breaker includes an undervoltage release (UVR) and comes with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration). That means it can signal its status to a PLC or safety relay without an add-on module — useful for remote trip indication or interlocking with upstream contactors.