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 <[email protected]> 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