Switches are important components in an electrical circuit. They are used for connecting, disconnecting, and controlling the direction of electric current. There have 3 main components such as 1) The connector is used as a connection point for the electrical circuit to the switch. 2) The electrical bridge is used to connect the two circuits or control the direction of the electric current as well. 3) The control parts are used to control the position and direction of the electrical bridge. They have many shapes depending on the usage, such as button type, rod type, rotary type, temperature-controlled type, etc. When the control part of the switch changes state, such as pressing a button, pulling a lever, or turning a control knob. The direction or position of the electrical bridge will change. As a result, the electrical circuit will be ON /OFF or redirect the electric current to another pole. For example, a fan switch that can control to turn on, off, or select the wind power according to the button pressed.