![ABB ST 200 M supplementary protectors](https://img.feedandgrain.com/files/base/wattglobalmedia/all/image/2018/11/pfi.ABB-ST-200-M-supplementary-protectors.png?auto=format%2Ccompress&q=70&w=400)
The ABB ST 200 M supplementary protectors are miniature circuit breakers (MCBs) for electrical equipment that provides higher levels of strength, performance, and savings while remaining compliant with the UL 1077 standard. The ST 200 M supplementary protectors are intended for use within industrial control panels, appliances and other equipment to protect against overcurrent where branch-circuit protection already has been provided or is not required.