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Double pole double throw door contact.
No and nc contacts are single throw.
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The most familiar form of switch is a manually operated electromechanical device with one or more sets of electrical contacts which are connected to external circuits each set of contacts can be in one of two states.
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This makes the the double pole double throw switch a very versatile switch.
Each input has 2 corresponding outputs that it can connect to.
Each of the terminals of a double pole double switch can either be in 1 of 2 positions.
Throw indicates the number of contact points.
If one switch can control one circuit for one operation it is a single pole switch.
This makes the the double pole double switch a very versatile switch.
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Changeover contacts are double throw.
It has four terminals.
A double pole double throw dpdt switch is a switch that has 2 inputs and 4 outputs.
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Either closed meaning the contacts are touching and electricity can flow between them or open meaning the contacts are separated and the switch is nonconducting.
Each input has 2 corresponding outputs that it can connect to.
The difference between a single and double pole switch is that the latter controls two circuits at the same time.
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Each of the terminals of a double pole double switch can either be in 1 of 2 positions.
A double pole double throw dpdt switch is a switch that has 2 inputs and 4 outputs.
Two for incoming hots and two for outgoing hots.