What the ratings mean for fit
The Siemens 3VA2110-8KQ42-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 100 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling, which simplifies panel sizing for a warm enclosure. Its 4-pole configuration handles three-phase plus neutral, and the interrupting capacity hits 440 kA at 240 V, 330 kA at 415 V, and 52.5 kA at 690 V, so it can be placed upstream of high-fault transformers or large motor control centers without cascading coordination concerns. The 800 V rated insulation voltage gives headroom for 690 V systems. This is a line-protection design with an integrated ground-fault monitoring version that uses summation current formation on L+N conductor — useful for detecting leakage on solidly-grounded systems without a separate GFCI module. It also carries a communication function for integration into a higher-level monitoring or energy management system.
Panel integration and footprint
The MCCB measures 86 mm deep, 140 mm wide, and 181 mm high. The 140 mm width is the critical dimension for multi-unit spacing on a DIN rail or mounting plate — verify available rail length if replacing an existing breaker of different width. The 86 mm depth means it will clear most standard-depth enclosures, but check gland-plate clearance if the breaker sits near the back wall.
Thermal and electrical limits
Maximum power loss is 7.7 W — negligible for enclosure heat budgeting but worth noting for high-density panels. The initial trip setting is 20 A with a full-scale value of 100 A, suggesting an adjustable thermal-magnetic or electronic trip unit. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. No undervoltage release is fitted, and there is no trip indicator.