Sp and dp refer to single pole and double pole st and dt refer to single throw and double throw.
Double pole double throw switch.
Each of the terminals of a double pole double switch can either be in 1 of 2 positions.
Dp switches control two independent circuits and act like two identical switches that are mechanically linked.
Double throw switches can divert the flow of electricity from one set of screw terminals to another.
Sp switches control only one electrical circuit.
You can see above how a double pole double throw switch can allow a circuit to be in 1 of 2 modes.
A double pole single throw switch is used for turning electricity either on or off.
Below is an example of a circuit which utilizes a double pole double throw switch.
This makes the the double pole double switch a very versatile switch.
Double pole double throw switch dpdt circuit.
An application for this switch is for reversing a direct current dc electrical motor.
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When the dpdt switch is switched one way flipped upward in the diagram the lamp and buzzer are both on while the.
A double pole double throw dpdt switch is a three selection electrical device in which there is one off and two on positions.
The motor s two power leads are reversed at one of the switches screw terminals.
Single throw type switches designate an on or off type operation.
Pole refers to the number of circuits controlled by the switch.