[NLRS] Power supply, and more, site

[Dr. Gerald N. Johnson]

I'd think two coil mechanical latching relays could be made for any 
current rating. Basically the end of one clapper is spring loaded to 
hold the other clapper on like the trip mechanism of a magnetic circuit 
breaker. And the release coil pulls the latch stick out of the way. Very 
much like a remote tripped box trap with the box held up by a stick with 
a long string on the stick.

151174573558 is 16 amps 12 volt coils.
310795886279, 20 amps, probably AC coil(s).
181102790515, 60 amps sure to be AC coil(s). But like many epay sellers 
they don't really know what they are selling.

And then there are shunt trip breakers, manual reset from 20 to 800 amps 
in the first couple dozen at:
www.ebay.com/sch/i.html?_odkw=latching+relay&_ipg=50&_sadis=200&_ftrv=1&_sop=12&LH_SALE_CURRENCY=0&_osacat=0&_dmd=1&_ftrt=901&_trksid=p2045573.m570.l1313.TR0.TRC0.Xshunt+trip+circuit+breaker&_nkw=shunt+trip+circuit+breaker&_sacat=0&_from=R40

And from the current version of P&B
www.te.com/catalog/pn/en/1-1414974-3?RQPN=1-1414974-3
is magnetic latching, two coils, 50 amp contacts.

Square D, now a division of Schneider appears to offer 12 volt DC shunt 
trip breakers but their web page is fubar, ask for a particular item I 
get the home page showing all products. If they have, them the lower 
priced competition will have similar products.

73, Jerry, K0CQ


On 12/1/2013 8:19 AM, Doug Reed wrote:
>
>
> <http://www.powerstream.com/dc2.htm>
> Yes, the PST-SR700 looks interesting. 20 amps continuous output and
> peaks to 50 amps. And it actually says peak power can be 1 to 5
> minutes, probably depending how overloaded it really is. But it should
> run any common SSB or FM rig with no trouble.
>
> The only other items worth noting is the 150ma minimum current draw
> and like most other DC converters I've seen, it has no auto-shutoff if
> the battery drops below an adjustable threshold for a period of time.
>
> So it would be fine for an attended operation but probably not
> suitable for operation at a remote unattended site where you don't
> want to damage the battery backup by going below 11 volts if the
> charging system dies.
>
> You can buy another module that will perform the shut-off function but
> that costs more money. The APO-30 is one such module but it draws more
> relay current the whole time the battery is engaged than the converter
> does at idle.....
>
> I haven' seen any shut-off device that uses magnetic latching relays
> yet.... The biggest such relays I have are 10 amp DPDT.... I think the
> diodes in the various FET switches cause problems when using them as
> the battery shut-off switch but I really haven't investigated that
> yet.....
>
> 73, Doug Reed, N0NAS.
>