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Subject: Re: Relay operating voltage.

Date: 02/07/01 at 11:45 AM
Posted by: Ned Stevens
E-mail: K&ELP@aol.com
Message Posted:

In Reply to: Relay operating voltage. posted by Bill on 01/19/01 at 10:59 AM:

I encounter this very problem quite a lot. The method I use is to measure the dc resistance of the coil. Find a relay that looks similar in a known manufactures catalogue and compare the resistance of the unknown relay to the coil resistance of the catalogue. I use the Potter & Brumfield catalog(Now Siemems). I try to find a
relay that is close in physical size as possible
and also the number of poles can sometimes affect
the amount of current needed for a particular voltage. A clue to tell the difference between AC and DC relays is that the AC relays generally have what looks like a copper ring around the
shaft of the electromagnet. I understand the slug
helps the coil maintain some residual magnetism when the ac voltage goes thru zero
I hope this helps.

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