Generally, these switches include four terminals which are used to connect or disconnect two pairs of terminals simultaneously. In this type of DPST switch, the term DPST stands for a double-pile single throw which is used to make or break the two circuit conductor’s connection within a single branch circuit. Sometimes, these types of switches are known as three-way switches. So, this switch can power any one of two circuits. Terminal 2 gets the required power so that the loads on 1 & 3 terminals can be powered and Terminal3 is used to connect to any load to activate any device. The first terminal is used to connect any load to give power to a certain device. Generally, these types of switches include three terminals which are normally used in pairs. The term SPDT stands for “Single pole double throw” toggle switch which is used to make or break a single conductor connection with any of two other single conductors. Similarly, once the switch is closed, then there is a flow of current throughout the load. Once this switch is open, then the circuit will be disconnected so there is no flow of current through the load. The main function of this switch is to make or break a single conductor connection within a single branch circuit. These switches work like a simple ON/OFF switch. The term SPST stands for “Single pole single throw” which includes two terminals like input and output. Generally, poles of these switches are the individual power supplies controlled through every switch, whereas throws are the different locations available to the switch like ON & OFF. These switch designs are available in four types where each type includes different poles & throws combinations like SPDT, SPST, DPDT, and DPST. As a result, we can control two loads with a single SPDT toggle switch. Similarly, when the pin3 is toggled then D2 LED will be turned ON & D1 LED will be turned OFF. Once the pin1 is toggled then D1 LED will be turned ON & D2 LED will be turned OFF. The connections in the above circuit follow as the pin1 & pin3 are connected to the D1 (LED) & D2 (LED) respectively. This switch is mainly used in the three-way circuits to control electrical appliances from two locations. So, we can get two outputs where the first output is from pin2 (COM) & pin1 and the second output is obtained from COM & pin3. This switch includes three terminals like one input and two outputs. This circuit can be built by using a 6V battery, two resistors R1 & R3, two LEDs D1 & D3, and a 21236N switch. The circuit diagram of the SPDT toggle switch is shown below. The switch terminals stick out from the bottom of the base. The base is used with the case to defend the inside components of the switch. The case is used to guard the internal components of the switch and also it gives support to the lever with the hole on the higher surface.
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