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Looking for a 5PDT or 6PDT sealed relay, 28V, low current contacts

Discussion in 'Electronic Design' started by Peter, Dec 28, 2013.

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  1. Peter

    Peter Guest

    I wonder if anybody has any kicking around...

    It needs a 28V coil, preferably with gold contacts so it can switch
    low currents. Most really sealed relays are milspec metal case ones
    of this general style:
    http://www.ebay.co.uk/itm/12-Volt-R...al_Components_Supplies_ET&hash=item257839a5ee

    but I can also use plastic cased relays so long as they are fully
    sealed e.g. the Panasonic K6EB24
    http://uk.rs-online.com/web/p/non-latching-relays/3992542/

    which is recently discontinued (and anyway Panasonic relays were
    always on a 1 year lead time).

    I've checked mouser.com and digikey and can't see anything there. They
    probably do some but their websites have no many items with no images
    it's hard to find one.

    There are many 6PDT milspec relays on US Ebay but nearly all are
    shabby 50 year old ones. Just a few are still 40-50 years old but in
    original bags so not too bad, but I would like gold contacts, and I
    believe silver contacts are not so good (not sure that is actually
    true).

    I know one can make one up with two 4PDT ones but I want to avoid the
    potential of some contacts closing and not others. I know there is a
    way to detect that (by wiring contacts on different relays in series
    and checking for continuity) and in fact I will be doing that anyway.

    I actually need 4PDT with the 5th contact being used to confirm it
    switched.

    If anybody has a couple I would buy them, Paypal...
     
  2. Jasen Betts

    Jasen Betts Guest

    I don't see how using 5-pole relays will ensure that.
     
  3. Guest

    A TE / Axicom V23030J1021A106 is 6PDT, 24 VDC coil, silver with gold
    flash terminals. It is "environmental category of protection RTIII",
    which is apparently one step below "sealed":
    http://www.relaymaster.com/Glossary.aspx#Category-of-protection-IEC-61810
    Digi-Key has no stock but says it is orderable; US$178 each in a minimum
    quantity of 5.

    Why do you need it to be sealed? That appears to be the tough part of
    this spec.
    How about sticking a solenoid on top of some regular snap switches
    ("Micro Switch" style)? Mouser lists several of these style of switches
    with IP67 ratings. If you get the kind that have holes through the
    body, they are relatively easy to gang up by stacking them up and using
    long screws. They probably won't all switch at precisely the same time,
    if that is important in your application.

    You could also stick a solenoid on top of a Honeywell 426EN9-8 switch
    from Mouser - 6PDT and sealed to MIL-S-8805 symbol 4. They have 9 in
    stock at the astonishingly low price of US$1,752.08 .

    Matt Roberds
     
  4. Don Y

    Don Y Guest

    Mount a bunch of reed switches in a coil? I.e., the switch contacts
    are "under glass"...
     
  5. Greegor

    Greegor Guest

    Quaint!

    Didn't they make SPDT reeds once?
    I seem to recall some with two contacts
    on one end of the glass capsule.

    Magnet biasing and all was sort of an art.

    With the right magnet biasing you could
    even make regular reeds function as
    normally closed, right?

    Isn't this a bit too retro, like using 555's?

    Visions of dozens of raw reed capsules
    stuck in one great big electromagnetic coil..

    Shades of the 1970's...
     
  6. Peter

    Peter Guest

    I need changeover contacts. One can get CO reeds but less commonly.

    Also I think with a single relay it is less likely for one contact to
    operate differently to the others.
     
  7. Peter

    Peter Guest

    wrote
    It is for switching signals in a light aircraft. One wants protection
    from humidity, which *will* get in given the air pressure swings.

    The traditional solution in avionics is an old box from e.g. Northern
    Airborne (RS08 etc) which contains 2 or 3 cheap 4PCO relays and they
    usually are wired with one contact on each all in series so the stuff
    being switched can tell if one or more of the relays has failed to
    move. But these boxes are quite bulky and IMHO badly made and open to
    corrosion everywhere except inside the relays.

    One can get the small 4PCO relays used in the RS08 from
    IMO/SDS/Panasonic (EN4 or DS4 series) and these are normally sealed.
    The IMO ones are even nitrogen filled. All these great relays are now
    discontinued - example
    http://www.ebay.co.uk/itm/10-NEW-PI..._DefaultDomain_0&hash=item1e7c635ed5#shpCntId
    I think these were widely used in telecomms but the market seems to
    have died.

    There are other more expensive relays that will do it, but the lead
    times are silly.
     
  8. Peter

    Peter Guest

    There is no way to completely ensure that...
     
  9. John S

    John S Guest

    The picture on the Web site looks like a dip switch, so it is
    misleading. The data sheet is what to examine.

    Good find, John.

    John S
     
  10. Guest

    I don't have an A&P. I don't even have a TG&Y. If your airplane falls
    out of the sky, I never heard of you. I also don't like buying lawyer
    food - not even a little bit - so I wish you luck with your project.

    Matt Roberds
     
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