Carbon brushes, also known as brushes, are widely used in many electrical equipment as a sliding contact. Carbon brushes are mainly made of graphite, grease-impregnated graphite, metallic (copper, silver) graphite.

Points to note when choosing a carbon brush are as follows:

1. The carbon brush shall be polished until the carbon brush can move up and down freely in the brush's grip: for example, if the carbon brush is polished too much, it will shake in the brush's grip, which is easy to be damaged, resulting in too small and hot contact surface.

2. Polishing the arc at the bottom of the carbon brush is similar to the arc of the cylinder of the medium-pressure automatic main valve;

3. Put the polished carbon brush into the corresponding brush holder and hold it tightly with your hand to check whether the contact surface is appropriate -- until the contact surface is greater than 70%, it is considered qualified.

Carbon brushes are mainly made of graphite, grease-impregnated graphite, metallic (copper, silver) graphite. When we buy carbon brush, pay more attention to the above points can be.