latching relay with input
Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=97269
Printed Date: November 03, 2025 at 8:59 PM
Topic: latching relay with input
Posted By: rsottawa
Subject: latching relay with input
Date Posted: September 19, 2007 at 7:45 PM
Hi All,
Is there such a thing as a latching relay with a (-) input (i.e alarm arm/disarm). I want to break continuality on a wire when the alarm is armed and connect when disarmed.
Thanks!
Replies:
Posted By: missionarymike
Date Posted: September 20, 2007 at 12:53 PM
Yes, i have used a model by Altronix RBR1224. this can use a + or - momentary pulse to latch and unlatch.
Posted By: hotwaterwizard
Date Posted: September 21, 2007 at 1:02 AM
 ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: hotwaterwizard
Date Posted: September 21, 2007 at 1:16 AM
By adding another relay you can get the requested Results. 
------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: rsottawa
Date Posted: October 16, 2007 at 4:37 PM
Will this 3 relay setup drain the battery in either latched or unlatched state?
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rsottawa
Posted By: hotwaterwizard
Date Posted: October 16, 2007 at 8:49 PM
As it sits in the unlatched state it will not drain the battery It only does when a pulse is applied and the output is latched.
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John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: dualsport
Date Posted: November 09, 2007 at 1:06 AM
You can use what's called a bistable relay to switch it on or off without a constant power draw in either state; they just need a single pulse to change positions.
They're pricier than regular monostable relays though, so depending on what you're looking to switch, you might be better off just using a transistor to turn your device on and off. Solid state devices won't draw power like relays do, and you can get them to handle pretty large currents.
Posted By: hotwaterwizard
Date Posted: November 09, 2007 at 8:44 AM
 ------------- John DeRosa (Hotwaterwizard)
Stockton California
When in doubt, try it out !
Posted By: rsottawa
Date Posted: November 09, 2007 at 2:22 PM
I ended up finding a 12v latching relay. Turns out 70's era VW's used a latching relay to control the head light hi/low beams. VW part number is 111-941-583. I have heard some people say the quality is not too good (made in Brasil) but so far so good. ------------- rsottawa
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