Relay question

Brian Marstella brian at
Fri Nov 28 01:51:56 CST 2014

Here's one to take a look at, an NTE7742.

They have the cut-sheet for it as well, maybe this will help.


On 11/28/2014 02:23 AM, Jim Brain wrote:
> I know this is not an electrical forum, but I thought perhaps someone 
> has seen what I am looking for.
> For an application, I am looking for a relay that is connected to 12V 
> through a switch, with the switch voltage also going to the middle of 
> a SPDT relay contacts.
>  * If I energize the latch once, for the time the button in pressed,
>    the relay flips "on" and the middle relay contact sends power to the
>    NO contact
>  * If the energize the latch a second time, for the time the button is
>    pressed, the relay flips "off" and the middle relay contact sends
>    power to the NC contact.
> The circuit works with an open relay of the kind they used to use in 
> garage doors (push button once, and door goes up, second press makes 
> it go down...)  But, we need a sealed relay to beat the weather (it's 
> for a lineman's bucket truck we own).
> Simulating this with some electronics and two relays won't work (well, 
> it would work, but it's for my father, and he really wants a 
> electrical/mechanical relay solution, like he has, but weathertight).
> I thought for sure there was such a thing as a D-type FF in relay 
> format, but all of the magnetic and mechanical latching relays I see 
> online use two separate coils to operate, which means two switches, 
> and that won't work (no more signal paths available in this application).
> I must not know what to call what I am looking for, and was hoping 
> someone had a better name for this type of thing or a suggestion of 
> where to look...
> Jim

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