Hi Mark,

Definitely ARC style relays.  The ceramic insulation is pretty
distinctive.  Not sure of all their uses, but I have a crystal frequency
selector hulk with ten of them arrayed behind the twenty crystal
sockets.  One larger DPDT relay selects which bank of ten can get
selected.  I suspect they're from a postwar ARC set, but I don't collect
those.

If anyone can use this assembly, let me know.
- Mike KC4TOS



On 10/11/2025 12:59 PM, Mark K3MSB wrote:
> Reposting with a subject......
>
> On Sat, Oct 11, 2025 at 12:59 PM Mark K3MSB <mark.k3msb@gmail.com> wrote:
>
>     I have several of these ARC-5 (generically speaking) style relays
>     and I've been unable to find out what they are used for.
>
>     They are numbered between 812 to 816.  I find nothing close in my
>     SCR-274N or AN/ARC-5 manuals.
>
>     DC Coil resistance is 40 ohms.  SPST.
>
>     image.png
>
>     Any ideas?
>
>     Mark K3MSB
>
>
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--
Michael Hanz - KC4TOS

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