The Change Over Switches with `Knife` Type Moving Contacts is used for changing over of the supply in industrial / domestic sections. Mex Switchgears Pvt. Ltd. Offers Change Over Switches with `Knife` Type Moving Contacts. Mex Switchgears Pvt. Ltd. Is registered with ISO-9001:2000 certification. The Change Over Switches have CR sheet steel enclosure, pre treated and powder coated elegantly; and contacts are Silver/ Nickel plated to ensure high conductivity & longer life.