A double pole switch is used when the voltage from two circuits has. The difference between a double pole switch and a single pole switch is the use of the switch in the installation or equipment.

Legrand Double Pole Switch Synergy Dp Indicator 45 A
When to use a double pole switch. A double pole switch is usually a bit larger than a single pole one but that isnt just because it has to accommodate two poles instead of one. A double pole double throw dpdt switch is a switch that has 2 inputs and 4 outputs. With 2 inputs it can connect to 4 different outputs. This makes the the double pole double throw switch a very versatile switch. Each input has 2 corresponding outputs that it can connect to. March 29 2019 references a double switch allows you to operate two lights or appliances from the same location.
These screw terminals are mounted on the side of the switch. A double pole switch can be used to control light and a fan or 2 lights on separate circuits. It is easy to wire a double pole switch to work as a single pole switch because only one side is used instead of both. For example you might want to turn on a bathroom light separately from the ceiling fan. Its also because the wires feeding electricity to the switch are larger and this is due to the fact that double pole switches are usually used to control 240 volt circuits. Single pole switch is referred as a single pole single throw switch.
Double throw switches can divert the flow of electricity from one set of screw terminals to another. A double pole single throw switch is used for turning electricity either on or off. Double switches sometimes called double pole allow you to separately control the power being sent to multiple places from the same switch. Each of the terminals of a double pole double switch can either be in 1 of 2 positions.