[volt-nuts] Latching Low Thermal EMF Relays

George Atkinson robertg8rpi at virginmedia.com
Sat Jul 12 04:33:44 EDT 2014


Hi Randy,
The datasheet does not break it down completely but experince of breaking
down their numbers, deduction (comparing catalog part numbers for low level
and low thermal relays)  and common sense indicates that the TLT indicates
low thermal EMF. They don't specify levels, but with this part number as a
starting point some websearching my get the info, or contact OMRON direct.

Robert G8RPI.


On 12 July 2014 01:40, Randy Evans <randyevans2688 at gmail.com> wrote:

> Thanks George,
>
> I had looked at that part but the data sheet was confusing.  It did not
> indicate how to specify low thermal emf or indicate what the emf voltage
> is.  Am I just missing it?
>
> Thanks again,
>
> Randy
>
>
> On Fri, Jul 11, 2014 at 1:58 PM, George Atkinson <
> robertg8rpi at virginmedia.com> wrote:
>
> > Hi,
> > The problem is that most low thermal EMF relays (COTO, Picckering etc)
> use
> > reed contacts for environment reasons, but reeds are not easy to latch.
> > The good news is that the Omron G6 range has the options you require (and
> > just about any other small relay option).
> > for example the G6AK-274P-STLT-US-DC5 which is dual coil latching, 5v
> coils
> > and low thermal EMF. It's about $10 from Mouser. The critical parts of
> the
> > number are AK for dual coil latching, AU for single coil latching and
> STLT
> > for low thermal EMF  DCx is coil voltage, between 3 and 28V.
> > Datasheet here http://www.mouser.com/ds/2/307/G6A_0911-4215.pdf
> >
> > HTH,
> > Robert G8RPI.
> >
> > P.S. Relay contact technology is fascinating. I once specified a lamp
> rated
> > (added cadmium in contacts) version of a relay. It was controlled by a
> PIC
> > driving 3 linear halogen lamps (see patent US7247429
> > <
> >
> http://worldwide.espacenet.com/publicationDetails/originalDocument?FT=D&date=20070724&DB=EPODOC&locale=en_EP&CC=US&NR=7247429B2&KC=B2&ND=5
> > >
> > ). A couple of years in production decided that a single letter change in
> > the part number of the relay didn't matter and saved a couple of dollars.
> > Guess what, we got failures with welded contacts (fortunatly I'd put a
> > thermal cutout in series with the lamps, mostly incase my PIC code fell
> > over, so no fires :-) Took a while before field service caomplained about
> > poor design......
> > Then there are the low level and power rated relays that use a gold flash
> > over silver. Trouble is if you use it for power they will fail in low
> level
> > use. A lot of mil-spec relays use this trick and I've seen problems where
> > relay swapping for fault finding has swapped a low level with a power and
> > back. No initial problem, but months later the contacts have gone high.
> > Then there was the supplier who tested all the new relays - under load,
> > DOH!
> >
> >
> > On 11 July 2014 19:15, Randy Evans <randyevans2688 at gmail.com> wrote:
> >
> > > That is an assembly but I am looking for an individual relay part that
> I
> > > can put on a PCB.
> > >
> > > Randy
> > >
> > >
> > > On Fri, Jul 11, 2014 at 7:15 AM, Wim de Jong <wim.de.jong.59 at solcon.nl
> >
> > > wrote:
> > >
> > > > The http://www.transmille.co.uk/8500.htm
> > > >
> > > > Wim de Jong
> > > >
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