What this MCCB does for a 100 A line
The Siemens SENTRON 3VA2110-5HL36-0KH0 is a 3-pole molded case circuit breaker (MCCB) built for line protection at a continuous 100 A — and it holds that rating flat from 40 °C all the way up to 70 °C, so no derating headache on a hot panel day. Interrupting capacity is where this one earns its keep: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and still 3.7 kA at 690 V. That 187 kA figure at 240 V means it can handle a high-fault utility feed or a large transformer secondary without the breaker becoming the weak link. It ships with a shunt trip (STL) release and two auxiliary switches plus a trip alarm switch HQ — so you can remote-trip it from a safety PLC or an E-stop string, and get a status signal back that the breaker actually opened.
Panel fit and wiring
Dimensions are 86 mm deep, 105 mm wide, 181 mm tall — a standard MCCB footprint that drops into most SENTRON distribution blocks and panel-mounting kits without a bracket mod. Power loss is a maximum 10 W at rated load, so the heat it dumps into the enclosure is modest — no forced cooling needed in a typical IP54 steel box unless you're packing a dozen of these in a row. Operating temperature range is -25 °C to 70 °C, storage from -40 °C to 80 °C. That covers most outdoor enclosures in temperate climates, though if you're parking it on a sun-blasted Gulf Coast roof you'll want to check the internal box temp stays under 70 °C.