1. Contact form of moving contact
The contact forms of moving contacts include single contact, double contact, and multi contact. The single contact type is the simplest form of contact, with the advantages of simple structure and easy manufacturing; The disadvantages are high wear and tear, and easy occurrence of flickering and sparks. The dual contact type adds a second contact on the basis of the single contact type, which can effectively reduce wear and reduce heat caused by contact resistance. The multi contact type includes various forms such as three contact, four contact, and six contact, with a large contact area that enables even distribution of arc energy. It is currently one of the most widely used contact forms.
2. Static contact contact form
The contact forms of static contacts include single shell, double shell, and triple shell. The single shell static contact has a simple structure and is easy to use, but it is prone to internal breakdown under high ionization pressure. The double shell design adds a metal shell to shield the inner electric field, and through good contact form, it can improve the contact quality and mechanical strength. Three shell type is easier to manufacture than double shell type, with uniform contact pressure, but higher cost.