The universal transfer switch (referred to as the 10,000-turn switch) is a cam rotary dial type switch. When the cam rotary dial B is rotated 45° from the middle position to the left, the cam presses the ball D1 to close the contact A1; When the cam rotary dial B is rotated 45° to the right from the intermediate position, the cam presses the ball D2 to close the contact A2. When the cam leaves the ball D1 or D2, the reaction spring moves the ball down to reset the contact. That is, as the position of the rotation of the cam changes, the bead can cause the contact to perform a multi-point on/off operation according to the change of the cam.