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