They re also a very common form of momentary switches.
Three pole single throw switch.
When the switch is in one position the common terminal is connected to the a terminal so current flows from the common terminal to the a terminal but no.
This means it has one input terminal and two output terminals.
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The switch will either be closed or completely disconnected.
One of the terminals is called the common terminal.
It s there so the electrician can connect the switch to another three way switch via a third wire.
Thus a double pole switch has three terminals.
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A double throw switch connects an input terminal to one of two output terminals.
The difference between a single and double pole switch is that the latter controls two circuits at the same time.
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It has four terminals.
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A three way switch has the same two brass terminals you find on a single pole switch although they are usually opposite each other instead of arranged vertically on the switch body.
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A single pole single throw spst switch is as simple as it gets.
They are commonly denoted 3pst 3pdt 4pdt etc.
The word throw simply refers to how many on positions the switch has.
Spsts are perfect for on off switching.
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The product controls one circuit with one on position.
A single pole double throw spdt switch is a switch that only has a single input and can connect to and switch between 2 outputs.
Spdt means that it is a single pole double throw which means it has two on positions.
A dt switch can also have a center position frequently on off on.
A single pole double throw switch can serve a variety of functions in a circuit.
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Spst simply mean single pole single throw.
The other two terminals are often referred to as a and b.
It s got one output and one input.
Single pole throw and double pole throw switches are by far the most common switches but triple and quadruple configurations are also available.
In addition the three way switch has a black terminal.
A double pole switch is what you need to control a 240 volt device because 240 volt circuits have two hot wires.
It can serve as an on off switch depending on how the circuit is wired.
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