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Earthing switch is a mechanical switching device for earthing parts of a circuit, capable  of withstanding for a specified time short-circuits currents, but not required to carry normal  rated currents of the circuit.  Earth switch is also connected on the isolator to ground residual  current. The tubular arm of earthing switch is permanently connected with the earthed frame  by a flexible connection. In the open position, the contact arm is located along the base frame. Fig. Earthing switch at open position During closing operation, the arm rotates in the vertical plane and reach the fix contact. In the   end position, the earthing blade moves up along its axis and is inserted into earthing contact. Arcing horns are connected to contacts of earth switch. An arc can establish between the switch  contacts when contact arm and fix contact connects during a short circuit fault.The  horns are  designed to endure the arc rather than the contact surfaces of the earth swi