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What is a Double Pole Single Throw Switch?

Double Pole Single Throw Switch is an electrical switch that controls two separate circuits simultaneously but can only connect them to one output or terminal each. It’s like having two simple on/off switches combined into one unit, where each pole can control a separate device or circuit. When the switch is toggled, it either closes (turns on) or opens (turns off) both circuits at the same time. This type of switch is useful in applications where it is necessary to activate or deactivate two circuits simultaneously with a single control action. For example, it can be used to turn on/off both the live (hot) and neutral wires going to an electrical device, fully isolating it for safety purposes during maintenance.

Double Pole Single Throw DPST Switch typically has four terminals: two for input and two for output(common terminal). The input terminals are usually in the middle, with the output terminals on the sides.

What is a Double Pole Single Throw Switch

There are also special switches with terminals on both the left and right sides. To identify which are input and output terminals, you can determine by the direction of the button press. The pressing direction will indicate whether a terminal is for input or output.


Double Pole Single Throw Switch Electrical Circuit

Below is an example of a DPST control circuit diagram.


With the function diagram and schematic described above, you can replace it with your device to build your setup.

The switch mentioned above is an integrated DPST switch, but there are also separate-button switches available. An integrated switch controls two circuits simultaneously, while separate-button switches can control different circuits independently, essentially functioning as a combination of two SPST switches.

two SPST switches

Related Resources

Single Pole Single Throw (SPST) Switch 

Single Pole Double Throw (SPDT) Switch

Double Pole Double Throw (DPDT) Switch

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