HD, HS series single investme and distribution equipment and double throw switch for AC 50Hz, rated current to 1500A, as not to switch on and off the manual frequency system, the DC circuit or isolating switch.

A, central handle single throw and double throw switch is mainly used for power cabinet does not cut off circuit with current, used as isolation switch.

B, side operating handle type switch, mainly for the power box.

C, central below the lever operation mechanism for knife switch is mainly used for the following operation, switch cabinet behind the maintenance, operation mechanism is arranged in front of.

D, lateral below the operating mechanism type knife switch is mainly used two side below the operation, switch cabinet in front of maintenance, operation mechanism can be installed on both sides of the switch cabinet.

Switch e, with interrupter can cut off the current load, other series of knife switch only isolation switches.