An animation illustrating how an spdt relay works.
Double pole double throw relay symbol.
Look at the figure 1 2 the centre dotted line indicates that the dpdt switch is actually two spdt switches in one package.
A positive and negative voltage can be placed on either end.
Single pole double throw spdt relay contains two coil terminals and common terminal then two switching terminals n o normally open n c normally close if there is not enough dc supply in.
Dpdt double pole double throw toggle.
Place the relay s rated coil voltage on these terminals.
This is the diagram below to learn all the pin terminals of a double pole double throw dpdt relay.
Pole refers to the number of circuits controlled by the switch.
Dp switches control two independent circuits and act like two identical switches that are mechanically linked.
A double pole double throw toggle switch is a combination of two individual spdt single pole double throw switches connected in the single assembly.
Sp and dp refer to single pole and double pole st and dt refer to single throw and double throw.
It has one common terminal and 2 contacts.
The polarity of the voltage does not matter.
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.
Clicking the arrow button to reveal an internal cross section of the relay as it opens and closes.
What do spst spdt dpst and dpdt mean.
Dpdt double pole double throw.
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.
But most frequently used relays are spdt relay and dpdt relay both are acts as electromechanical switch.
