Dry contact vs Wet contact

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mbrooke said:
Dry is just open or closed, wet supplies some type of power.
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Lets consider magnetic motor starter.
it has main power contacts and auxiliary contacts.
so which one should be dry and which one wet.??

I have confusion here thts y I used magnetic motor starter as an example.

Thanks
 
kody916 said:
Lets consider magnetic motor starter.
it has main power contacts and auxiliary contacts.
so which one should be dry and which one wet.??

I have confusion here thts y I used magnetic motor starter as an example.

Thanks
Click to expand...


Reading the ET thread I couldn't disagree more with what is being said (at least the 'point' BBQ is trying prove via argument :roll:), but going by my definition all contacts that rely on external power in some way are dry contacts.


To me a wet contact is for example a furnace or HVAC control board with integral power supply. When for example a thermistor senses a temperature change the wet contact will become live and send power to a contactor. No 24v transformer is being used to supply power to the contactor, all of it is coming from the switch.
 
kody916 said:
Lets consider magnetic motor starter.
it has main power contacts and auxiliary contacts.
so which one should be dry and which one wet.??

I have confusion here thts y I used magnetic motor starter as an example.

Thanks
Click to expand...

aux contacts are dry.
 
Dry contacts are isolated from a voltage source. This is also common slang in communications where conductors with no carrier power would be referred to as a "dry pair."

Wet contacts have voltage applied to one of the poles and the operation of the contact causes voltage to be applied to rest of the circuit.

Wetted contacts means they use mercury as a conductor to reduce contact surface wear in high current applications.
 
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