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REQ: Help with old relay pinout, please

Discussion in 'Electronic Design' started by Cap'n John, Jun 27, 2007.

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  1. Cap'n John

    Cap'n John Guest

    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.


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

  3. whit3rd

    whit3rd Guest

    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.
  4. James Waldby

    James Waldby Guest


    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.
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