Switchgears type ZZ-3/S3, ZZ-3/S2, ZZ-3/S3/P, ZZ-3/S2/P are designed for connecting and switching receivers (especially belt conveyors, pumps, fans) in the mine 3-phase power grid with an insulated transformer star point or earthed through a resistor for rated voltages 3,3kV, 6kV, 10kV 12kV.
