What this breaker is and where it fits
The Siemens SENTRON 3VM1110-3ED12-0AA0 is a 1-pole molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries a 100 A continuous rating at 40 °C ambient, with a TM210 thermal-magnetic overcurrent release that handles both overload and short-circuit conditions. The interrupting capacity hits 53 kA at 240 V AC, dropping to 8 kA at 415 V AC — enough for most commercial and light industrial feeder circuits. Rated insulation voltage is 500 V, and the front face carries IP40 protection, so it's suited for enclosed panel mounting where dust ingress is minimal.
Thermal derating and real-world current
The 100 A rating holds flat from 40 °C through 50 °C. Above that, it begins a gentle derating curve: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. If your panel ambient runs hot — say, near a transformer or in a non-climate-controlled enclosure — this breaker still delivers usable capacity without nuisance tripping. The 8 W maximum power loss is modest for a 1-pole 100 A device, so it won't cook adjacent components in a tightly packed DIN-rail assembly.
Mechanical fit and panel integration
At 25.4 mm wide (1 inch), 130 mm tall, and 70 mm deep, this single-pole MCCB fits a standard 25 mm module slot on the DIN rail. The 70 mm depth is the key dimension for gland-plate clearance — it leaves room behind a 100 mm deep enclosure for wiring and bus connections. No undervoltage release, no ground-fault monitoring, no communication module on this variant; it's a straight thermal-magnetic line protection device with a trip indicator absent, so commissioning is straightforward: wire the line and load, torque to spec, and test the mechanism.