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

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:

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but I can also use plastic cased relays so long as they are fully sealed e.g. the Panasonic K6EB24

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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...

Reply to
Peter
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Reply to
John Fields

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

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Reply to
Jasen Betts

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":

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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

Reply to
mroberds

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

Reply to
Don Y

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...

Reply to
Greegor 

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Reply to
John Fields

Don Y wrote

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.

Reply to
Peter

snipped-for-privacy@att.net 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

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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.

Reply to
Peter

Jasen Betts wrote

There is no way to completely ensure that...

Reply to
Peter 

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http://masterelectronics.com/coto-technology/7143-05-1010.html?p=11193312
Reply to
John Fields

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

Reply to
John S

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

Reply to
mroberds

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