"Dry Contacts" refer to a set of electrical contacts that switch such low voltage/current that there is no "self-cleaning" effect caused by arcing/sparking during operation.
Contacts used in such applications should be made of precious metals (gold, rhodium, platinum, etc.) to ensure reliable operation, especially in a corrosive atmosphere where an insulating film might build up.
Well, let's see. A mercury switch is a "wet contact", so... A "dry contact" is the one all of us are accustomed to seeing, with contact points. The wet contacts don't wear out like the dry ones, and unless I'm wrong (as usual), are capable of carrying higher current for their relative size. Scott 35, are you around?
Re: Dry Contacts#5203 11/08/0108:10 AM11/08/0108:10 AM
I'm missing the boat here in a big way. Not to be sarcastic or disrespectful but: All contacts receive power from a source. No contact makes its own power. All contacts supply power to a load. The examples given by JBD could be reversed, and it would still seem to make just as much sense to me...none. (I'm looking around the house for my dunce cap)