The performance of this product is leading in the world. There are two types of structure: double-column horizontal telescopic disconnector and three-column horizontal telescopic combined disconnector. It is usually placed on the incoming and outgoing sides and used on the lines. It has the ability to switch on and off the conversion voltage of 435V and the large-parameter bus conversion current of 3000A, which is at the international leading level. It is equipped with JW7-550 (W)/J63 super-class B grounding switch, which can open and close electrostatic induction current voltage up to 100kV/50A