The 1 terminal is common which is normally close with 2 and normally open with 3. Below is an example of a circuit which utilizes a double pole double throw switch.

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Double pole double throw switch wiring diagram. Complete wiring diagram of double pole double throw switches from battery all the way through to the motors 4 snowblower on a craftsman tractor. Wiring diagram june 26 2019 0052. This is how you wire a double pole double throw dpdt switch. Also a 8 pin glass finder types relay with also a dpdt relay with diagram. It shows the components of the circuit as simplified shapes and the knack and signal contacts amid the devices. You can see above how a double pole double throw switch can allow a circuit to be in 1 of 2 modes.
When the dpdt switch is switched the other way flipped downward the led and the speaker are both on while the lamp and buzzer are off. When the dpdt switch is switched one way flipped upward in the diagram the lamp and buzzer are both on while the led and speaker are off. It has 2 terminals and 4 connectors and you can look at the dpdt relay as the equivalent of 2 single pole double throw spdt relays. Double pole double throw switch wiring diagram wiring diagram is a simplified up to standard pictorial representation of an electrical circuit. Double pole double throw switch wiring diagram dpdt switch wiring diagram wiring diagrams active. I shown a power relay with schematic diagram.
In the above double pole double throw relay schematic diagram. 2 methods are explained with associated wiring diagrams. In the diagram a1 and a2 is coil terminals of electromagnetic relay. In this video i give you the characteristics of a dpdt switch and how to wire. By circuit diagram the dpdt relay double pole double throw is quite interesting and can be used in various scenarious including for changing the direction of a motor as you can see in the picture below.