What it is and what it does
The Siemens SENTRON 3VA2110-5HN32-0KH0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current at 40 °C, designed for line protection in distribution panels and motor control centers. It carries a full set of interrupting ratings: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V — numbers that tell you it handles high-fault scenarios downstream of a transformer or upstream of a motor branch without cascading failures.
What the ratings mean for fit
The 100 A rating holds flat from 40 °C through 70 °C — no derating curve to wrestle with in a warm enclosure. That's unusual for an MCCB and simplifies panel thermal calculations. The 3-pole frame (181 mm tall, 105 mm wide, 86 mm deep) fits standard Siemens SENTRON mounting footprints; you'll land it on a DIN rail or bolt it to a backplate. Power dissipation is 10 W maximum, so it won't cook adjacent components in a tightly packed panel. It ships with a shunt trip (STL) release and a complement of 2 auxiliary switches plus 1 trip alarm switch (HQ). That means you can remote-trip it and get status feedback — handy for a safety circuit or a PLC-driven shutdown sequence. No undervoltage release, no ground-fault module, no communication function on this variant.