The earthing switch is the natural complementary safety device to the AC or DC circuit breakers and it enables to ground simultaneously both up-side and down side electrical circuits once the circuit breakers have been opened. This equipment is mandatory to ensure the highest security level to the maintenance personal, and its operation is mechanically key interlocked with other safety devices.
The safety philosophy is based on a simple step by step principle that enables the manipulation of a safety device only once the previous one in the traction chain has been operated and locked in the grounding position
