Indeed. I did not try to dig into some analysis, but it seemed to me that it is not easy to create a half-henry solenoid with only a reed in the center. I must be wrong.
In any case it appears that a couple of more tests are needed to verify. My suggestion would be to apply a variable lab power supply and increase the voltage between the outside leads with an ohmmeter on the other two wires.
Might also place a strong magnet near the device and check continuity.
I am sure that this is a reed relay. We just moved so I can't find my
1960s industrial catalogs for the specs though Marc's suggestions for the ratings is probable. Dimensions would help.
Swinging a magnet near it will show if the contacts close (the middle wires of the three and the single wire other end), and slowly dial it up from around 4VDC to see where it trips.
Checking a few of my old reed relays (we fix old arcade games), 5V relays are roughly 300 to 500R, 24V relays are around 2K, and 12V around
1K. Some of the smallish ones (about 1 inch long) are rated at 1A too.
John :-#)#
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