Double switches sometimes called double pole allow you to separately control the power being sent to multiple places from the same switch. A spst toggle switch can act as a simple on off switch in a circuit.

Hubbell Wiring Systems M223sp Toggle Switch With 1 Key Double Pole Double Throw On Off On 12 Vdc Black
Double pole toggle switch wiring. The motors two power leads are reversed at one of the switches screw terminals. The difference between a single and double pole switch is that the latter controls two circuits at the same time. An application for this switch is for reversing a direct current dc electrical motor. Toggle switches are common components in many different types of electronic circuits. A double pole double throw dpdt switch is a three selection electrical device in which there is one off and two on positions. Spst toggle switch wiring.
A double switch allows you to operate two lights or appliances from the same location. It has four terminals. We will now go over the wiring diagram of a spst toggle switch. While spdt and dpdt toggle switches can flip different devices on or off in a cirucit. A double pole switch is what you need to control a 240 volt device because 240 volt circuits have two hot wires. Two for incoming hots and two for outgoing hots.