SENTRON 3VA1110-6MH32-0CC0 — MCCB for Motor and Starter Protection
The Siemens 3VA1110-6MH32-0CC0 is a SENTRON molded case circuit breaker (MCCB) designed specifically for starter protection — meaning it is built to handle the high inrush and overload profile of motor starters, not just general distribution. Three poles, rated 100 A continuously at 40 °C with a rated insulation voltage of 800 V. Breaking capacity reaches 220 kA at 240 V, 154 kA at 415 V, and 121 kA at 440 V; at 500 V and 690 V it holds at 7.5 kA — the arc extinction voltage limit of this frame size. That 220 kA figure at 240 V tells you this breaker is sized for high-fault-capacity industrial panels where the available fault current is substantial, not for light commercial service. Auxiliary switching is handled by two HQ auxiliary switches and an undervoltage release (UVR) is factory-fitted. The base switch platform is the 3VA11106MH320AA0. Power loss at full rated current is 27.5 W — relevant for enclosure thermal calculations if you are stacking multiple breakers in a confined panel. Operating temperature range spans -25 °C to 70 °C; storage from -40 °C to 80 °C. The 70 mm depth, 76.2 mm width, and 130 mm height fit the standard SENTRON 3VA mounting footprint — no panel rework if swapping from a same-frame 3VA.
Current Derating and Thermal Reality
The 100 A rating holds flat from 40 °C through 50 °C. At 55 °C it derates to 98 A, at 60 °C to 96 A, at 65 °C to 94 A, and at 70 °C to 91 A. That is a 9 A drop across the full temperature span — predictable, linear derating. For a panel builder: if your enclosure ambient runs at 60 °C, you can still load this breaker to 96 A continuous without nuisance tripping. The 27.5 W power loss is the heat the breaker itself dumps into the enclosure at full load; factor that into your thermal budget alongside the derating curve.