Standard relays tend to develop a thin layer of oxidation on the=20
contacts.  The switching current through the contacts burns it off.  At=20
really low currents, the oxidation won't burn off, and you will get=20
intermittent contact.  If you were switching something like an input to=20
a PIC, you would need to use a low signal relay.

Low signal relays typically have a wiping action during switching to=20
clear the contacts.  In the old days, they used Mercury.

Kerry


alan smith wrote:
> So I'm looking for a small form factor relay, only need to switch less th=
an an amp, and seems to be lots of choices in relays termed...."low signal =
relays" so whats the usage case for these vs a 1A "standard" general purpos=
e relay?
>
>  =20

--=20
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