Sp and dp refer to single pole and double pole st and dt refer to single throw and double throw.
Spdt vs dpdt door contact.
Standard reed switches are spst simple on off but spdt changeover versions are also available.
Pole refers to the number of circuits controlled by the switch.
What do spst spdt dpst and dpdt mean.
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Dp switches control two independent circuits and act like two identical switches that are mechanically linked.
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A switch in a mechanical and electrical setting is a control device that is used to establish or interrupt the flow of power or electricity into a circuit.
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.
Sp switches control only one electrical circuit.
The contacts of a reed switch are closed by bringing a small magnet near the switch.
Dpdt spdt stands for single pole double throw while dpdt stands for double pole double throw both terms are varieties of switches.
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But most frequently used relays are spdt relay and dpdt relay both are acts as electromechanical switch.
Spdt single pole double throw.
The single pole double throw spdt relay is quite useful in certain applications because of its internal configuration.
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.
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In spdt spdt relays single pole double throw spdt relay are very useful in some applications due to its internal configuration it has one common terminal and 2 contacts in 2 different versions can be normally closed and the other opened or it may be normally open and the other closed.
So basically you can see the spdt relay as a way of switching between 2 circuits.
One can be normally closed and the other one is opened or it can be normally open and the other one closed.
Reed switches have a glass body which is easily broken.
They are used in security circuits for example to check that doors are closed.
It has one common terminal and 2 contacts in 2 different configurations.