What it is and what the ratings mean
The Siemens 3VA2110-8KQ36-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 100 A continuous current at up to 70 °C ambient — meaning it holds that rating across the full operating temperature range without derating, which is unusual and simplifies panel design for warm environments like enclosed switchboards or near furnace lines. Three-pole construction with a 440 kA interrupting capacity at 240 V — that is a very high fault-clearing rating, sized for large industrial service entrances or distribution points where available fault current is severe; at 690 V it still interrupts 52.5 kA, covering most 690 V industrial systems. Designed specifically for line protection (not motor or generator protection), so the trip curve and accessories are optimized for cable and busbar protection in main or branch feeders.
Dimensions and panel fit
Measures 105 mm wide, 181 mm high, 86 mm deep — fits standard MCCB panel cutouts and DIN-rail or fixed-mount enclosures; the 86 mm depth is shallow enough for most 200 mm deep enclosures with room for wiring gutters.
Ground-fault and communication capability
Includes ground-fault monitoring via summation current formation on the L-conductor — meaning it detects leakage current without a separate GFCI module, useful for personnel protection in wet or corrosive environments. Communication function is built in, enabling remote monitoring and trip indication over a bus system — no external adapter needed for basic status reporting.