Relay question

Brian Marstella brian at
Fri Nov 28 01:39:29 CST 2014


You'll probably need to search for a magnetic latching relay. I've found 
a number of examples from Schneider, Rockwell, etc. However, the ones 
I've found so far all have 24 VDC coils, not 12 VDC. If you look around 
some of the electronics suppliers and/or eBay, you might come across the 
exact model you need. If I see one, I'll forward the info along.



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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