Switches definition

Switches commonly are used in electronic circuits. They enable control of the circuit through switching it on/off or controlling a range of other features. 

How do Switches Work? 

Electronic switches are binary devices which sit within a circuit to control the flow of electricity. They work by interrupting the flow of electrons and switching the circuit on or off. Switches contain terminals which connect to metal contacts. When the terminal and contact are touching, switch will be closed and the current can pass through. When the terminal and contact are not touching, switch will be open and the current cannot pass through the circuit. 

What are Poles and Throws? 

The number of circuits controlled by a switch is referred to as poles. The number of positions that the switch can adopt is called throws. The combinations of these are: SPST (Single Pole Single Throw) SPDT (Single Pole Double Throw) DPST (Double Pole Single Throw) DPST (Double Pole Double Throw) 

What types of switches are there?

The switch type you require depends on the connections you wish to make within your circuit. Switches often are grouped by the way they are operated, for example, rocker switches that rock side to side. Alternatively, they are classified by their application, for example, keypad switches can be used with keypads. Here are some examples of switch types: Detector DIP/SIP Foot Hall Effect Joystick Key Keyboard/Keypad Piezo Microswitches Rotary Push Button Toggle .