I read a section on relays in "Instrument Engineers' Handbook" by Roberts, Liptak and Durden. They mentioned about relays with coil sensitivity ex: of 20 micro watts. I could not find that kind of relays on the market (by searching relay manufacturers). Has any one run into that kind of relay? Where can I find it?
hi adam,
i didn't work with this type or relays, although i know there are some ABB ultra sensitive relay, I attach some datasheet:
http://www05.abb.com/global/scot/scot296.nsf/veritydisplay/c1256d32004634bac1256df000652833/$file/1MRK508018-BEN_en_Current_and_voltage_measuring_relays_RXIK_1__RXEEB_1__RXIB_24.pdf
remus
Hi Remus,
Thanks for datasheet. The ABB relay is typically for industrial purpose. Yes, it is sensitive when compared to other relays in same category. I read the data sheet and they are indeed in micro watts range. They are probably too big for my purpose. I had in my mind a signal type commonly used for communication purpose like fax machine etc...Thanks for a link again.
As a power system protection engineer I know that certain relays used a polarised moving coil relay that was very sensitive. It is similar to a loudspeaker movement. Maybe if you do a search on "sensitive moving coil relay.
for those who are interesting,
I found relay with specs described by authors in the book that I mentioned before. Also it is almost fitting my requirement (my switching output limit is 100mW)
See the link
http://ca.mouser.com/new/omron/Omron2SMES-01/
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