In an electricity distribution grid, Metal-Enclosed Switchgears are factory assembled, metal enclosed set of switchgear used at the load connection points of either ring-type or radial distribution networks. It has many different options of functional units; namely transformer protection units (with fıse or circuit breaker -SF6 or Vacuum), metering unit, coupling unit, etc.

Air Insulated Metal-Enclosed Switchgears can be characterized by their type of insulation which is air. The switch used to isolate the transformer can be a fusible switch, or may be a circuit breaker using vacuum or gas-insulated interrupters. The unit may also include protective relays to operate the circuit breaker on a fault.