Modern world with an extra exponential growth rate is made possible due to countless science innovations, electricity is one of them. Engineers have developed various well organized distribution systems for electrical power distribution. But without safety precautions these easy power system can leads to hazards, such as fire caused by short circuits. Annual damage due to electrically caused fire is about $643.9 million per annum in an analysis of National Fire Protection Association. Various safety precautions were Fuses of various type, but modern methods involves Circuit Breakers. This paper analysis the various types of modern circuit breakers and mechanism behind them.