REQ: Help with old relay pinout, please

I have a C.P. Clare sealed octal-base relay, 1960s vintage that I might
have a use for. Coil is shown as pins 7 & 8, but no voltage given. Part
No. is HG2A1016.

Any help would be appreciated.


TIA!

Cap'n John

 

power it up on a variable power supply. see what voltage it kicks in
at , then add, say, 20%


martin

 

First, it's sealed because it's a mercury relay (very reliable, might
need to be mounted right-side-up).

My '70s catalog lists

HG2A1015 as a 1250 ohm/22 mA coil unit, with
must-operate at 30V, nominal coil voltage 71V

HG2A1002 as 140 ohm/67 mA coil, with must-operate at 10V,
nominal coil voltage 24V

HG2A1001 as 5000 ohm/11 mA coil, with must-operate at 62V,
nominal coil voltage 142

"HG2" means it's mercury double-pole switching.
It looks like the pattern is that the coil R*I**2 = constant, so
you can use an ohmmeter to figure it out.

 

....

I think that will be well on the low side of nominal voltage, but if it works
consistently, ok. Anyhow, just wanted to point out that the HG part of
the part number probably stands for mercury-wetted contacts, if it
follows the nomenclature of more-recent Clare relays.