Contact support, contact unit and rotary switch

The utility model provides a contact support, a contact unit and a rotary switch, and belongs to the technical field of low-voltage apparatus switches. The contact support comprises a first support and a second support which are connected with each other, and an energy storage cavity is formed between the first support and the second support. A moving contact of the contact unit is fixed on a contact support, and the contact support rotates along with the rotating shaft. After the moving contact and the static contact of the contact unit are separated, the energy storage cavity accommodates the static contact. The energy storage cavity comprises a cavity opening and a cavity body. The cavity opening is away from the rotating shaft relative to the cavity body. In the extending direction of the rotating shaft, the size of a cavity opening of the energy storage cavity is smaller than that of a cavity body. According to the scheme, the electric arc in the energy storage cavity can be discharged timely and rapidly