A switchgear has to perform the functions of carrying, making and breaking the normal load current like a switch.

In addition, it has to perform the function of clearing the fault current for which sensing devices like current transformers, potential transformers and various types of relays, depending on the application, are employed.

There also has to be provision for metering, controlling and data, wherein innumerable devices are used for achieving the switchgear function.

Thus switchgear can include circuit breaker, current transformers, potential transformers, protective relays, measuring instruments, switches, fuses, MCBs, surge arrestors, isolators, and various associated types of equipment.