What it is and what it does
The Siemens SENTRON 3VA1110-5EF36-0KC0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection — meaning it sits at the feeder or sub-feed to protect cables and busbars from overload and short-circuit, not a specific motor or load. It's rated 100 A continuous at 40 °C ambient and carries a massive 187 kA breaking capacity at 240 V AC, tapering to 121 kA at 415 V and 75.6 kA at 440 V — enough to handle high-fault utility feeds without cascading upstream. The breaker ships with a factory-fitted shunt trip (STL) release and two HQ auxiliary switches, so it's ready for remote tripping and status feedback out of the box — no separate accessory kit to order. Rated insulation voltage is 800 V, and max power loss at rated current is 25 W, which matters for enclosure heat rise calculations.
Ratings and what they mean for your panel
The 100 A rating holds flat from 40 °C to 50 °C, then derates to 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. If your enclosure runs hot — say a packed MCC with other breakers — you need to factor that derating into the load schedule; the breaker won't trip early, but it won't carry a full 100 A at 70 °C. Footprint is 76.2 mm wide (3 in), 130 mm tall, 70 mm deep — a standard 3-pole MCCB slot on most DIN-rail or panel-mount assemblies. The shunt trip means you can wire an E-stop or PLC output directly to the breaker for remote opening; the two auxiliary switches give you both NO and NC status contacts for the control system. Operating temperature range is -25 °C to +70 °C, storage from -40 °C to +80 °C. No undervoltage release, no ground-fault monitoring, no communication function — this is a straightforward line-protection breaker, not a smart metering device.