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Author Question: Why is the contact surface in relays and contactors coated with a special coating of very conductive ... (Read 25 times)

armygirl

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on: Jul 26, 2018
Why is the contact surface in relays and contactors coated with a special coating of very conductive material?
 
  What will be an ideal response?

Question 2

How can a service technician learn what problems a communicating system has been experiencing?
 
  What will be an ideal response?


softEldritch

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Reply #1 on: Jul 26, 2018
Answer to Question 1

This coating is very thin but effective in preventing the contacts from becoming quickly damaged from the momentary arc as they open and close. This arc would normally cause the contacts to weld themselves together.

Answer to Question 2

Go to the service screens on the communicating thermostat and read the fault history


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