Electrical Circuit Breaker

In an electric power system, a switchgear is composed of electrical disconnect switches, fuses or circuit breakers used to control, protect and isolate 
In the event of an electrical surge, an effective switchgear will trigger, automatically interrupting the flow of power and protecting the electrical systems from damage. Switchgears are also used for de-energizing equipment for safe testing, maintenance, and fault clearing
Switchgear are designed for high voltages (up to 350 kV) whereas switchboards are designed for voltages below 600V. Because switchgear are designed for high power handling capacity, they make use of devices like circuit breakers