This SPDT switch configuration is noted as "ON/OFF/ON". This third switch can be set to an "OFF" status in which neither circuit one or two is complete. Confusingly, a third configuration exists for some SPDT switches. Since both circuit options rely on the input terminal, this switch is a single pole switch because only one completed circuit can exist at any given time. If the switch is set to "ON-2," the second output terminal establishes the connection with the input terminal, thus completing the second circuit.If the switch is in the "ON-1" position, the connection between the input terminal is established with the first output terminal, thus completing the first circuit.An SPDT switch allows for an "ON/ON" configuration, which means the switch's input terminal is always completing one of the two possible circuits that the switch controls. What is an SPDT Switch?Īn SPDT switch consists of three terminals and connects the source terminal and one of two output terminals. When the switch is set to "ON," the two connected terminals complete the circuit and the light turns on. When in the "OFF" position, the circuit breaks and the light turns off. The light switch in the room you're in right now probably uses an SPST switch. Turn the switch to "OFF" to eliminate the terminals' connection. Power the switch "ON" to establish a connection between the two terminals. An SPST switch embraces a basic "ON/OFF" control of a single circuit and consists of two terminals that serve as electrical connection points. The simplest form of a switch is an SPST switch. For example, a Single Pole Double Throw (SPDT) switch has a single pole and two different switch output options. Switch throw: A switch throw describes the number of output connections each pole of the switch can have.As we will see later, a Single Pole Single Throw (SPST) switch controls a single circuit. Switch pole: A switch pole describes the number of separate circuits that the switch or relay controls.Every type of switch has two main components that control the circuit: a switch pole and a switch throw. Relays are electrically actioned electromechanical switches. Manual switches are more common in day-to-day life, but you can apply the same concepts to relays. The four most common types of switches in circuit design are:
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