Switchgear is responsible to connect and disconnect the electric power supplies and systems. Switchgear is a general term which uses to covers the switching device and its various combinations with some associated control, measuring all parameter, protective and regulating equipment, together with accessories, enclosures and supporting structures .
Switchgear mainly applied in electrical circuits and systems from low voltage like domestic 220/240V applications to transmission networks up to 1100 kV. To set up this control system a wide range of technology is needed and this chapter is split into the four main subdivisions of low voltage, medium voltage (Distribution System), high voltage (Transmission System) and DC.