Which Relay?
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=38576
Printed Date: May 14, 2024 at 10:10 AM
Topic: Which Relay?
Posted By: Chromic-Chris
Subject: Which Relay?
Date Posted: September 04, 2004 at 10:08 AM
If you're adding functions from window rollup, or rear defrost, front fan, to heated seat activation......which relays are typically used for each application? All would be SPDT 12v, but what about current ratings etc....? Are there a few out there that you guys swear by?
Replies:
Posted By: Teken
Date Posted: September 04, 2004 at 11:10 AM
30-40 amp relays are the standard. Read, measure the current flow for each source you wish to interface to.
Or you could simply look at the fuse rating on the panel. Remember, the manufacture has stressed the load on each circuit so the fuse rating is fairly accurate with all things being equal.
Relay brands I use are Bosch 0 332 204 150 for internal use, Bosch 0 332 204 171 sealed exterior use, P&B VF4-45F11 internal use, and Midtex internal use with diode V461B3D1.
All of them are proven performers, given the proper placement, installation, and maximum current demands.
Regards
EVIL Teken . . .
Posted By: Chromic-Chris
Date Posted: September 04, 2004 at 11:11 PM
Thankyou Mr. T. Appreciate your info!
Posted By: RufNUSD
Date Posted: September 04, 2004 at 11:20 PM
Uh for the most part all relays are rated at 30a across their contacts. Nothing security related requires more than that....nothing.
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Someone pass me that bottle.
Posted By: Teken
Date Posted: September 05, 2004 at 4:18 PM
RufNUSD wrote:
Uh for the most part all relays are rated at 30a across their contacts. Nothing security related requires more than that....nothing.
That would not be accurate. If you're doing a RS for a heavy duty GM van, or Ford which easily draws 40 amps, a 30 amp relay would not lasts too many years.
All the high end alarms systems in the past supply a 40 amp relay to do the starter inhibit.
As it is with anything it seems these days, common sense, and quality has gone out the window.
Just because everyone is doing it now with a 30 amp relay doesnt mean that is correct for all applications.
Bottom line, apply the correct relay with the appropiate current rating to ensure the MFR of 10 years.
That is the standard set out by Bosch and P&B, not 2 years.
Regards
EVIL Teken . . .
Posted By: RufNUSD
Date Posted: September 09, 2004 at 9:22 PM
Brother man.... you are telling me that you pull more than 30amps continuous? The only thing in security related history, in a lot of experience, which adhered to relay amperage problems was Code Alarm and their starter kill-------15 years ago. I have never replaced a 30a relay due to meltdown of amperage in a security install even after working on more than 50,000 personally and seeing more than 500,000 go thru my shop. Call it a fluke?....Cheers, Mel
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Someone pass me that bottle.
Posted By: Teken
Date Posted: September 09, 2004 at 10:29 PM
I am stating to you that specific vehicles and situations such as large GM vans who's interior heaters and blowers for example easily draw down 30 ampere's.
In that example, are you saying you would simply use a standard 30 amp relay, without the proper amount of current buffer???
Regards
EVIL Teken . . .
Posted By: Chromic-Chris
Date Posted: September 10, 2004 at 11:05 PM
I can't. After reading the above, I had nightmares all night. ....dreamed I was brawling in the streets with brass knuckles, baseball bats, and assorted 12 V relays. (actually I did have a thought though...some models have limited option channels. One way to add features is to group them on the same channel like putting heated seats (20A) and rear defrost (10A) on the same channel. This would tie 2 relays together at about 30A. Then I realized the outputs would be in parrallel so it shouldn't be additive............? As far as option channel trigger outputs I think the max is usually about 300 mA. That should be Ok to energize two relay coils right? ...Sweet dreams!
Posted By: tbirdman74
Date Posted: September 11, 2004 at 6:07 AM
Chromic-Chris wrote:
....dreamed I was brawling in the streets with brass knuckles, baseball bats, and assorted 12 V relays
HA!! That is one of the funniest things I have heard in years. Remember the Heroes. Let's Roll. ------------- If it don't fit, Force it.
If it breaks, You needed a new one anyway!
Posted By: mobilevt
Date Posted: September 11, 2004 at 2:16 PM
Aww heck, get a 70a relay and hibernate!!! Sean ------------- Emergency Vehicle Technician
Got Freedom? Thank a vet!
Posted By: RufNUSD
Date Posted: September 12, 2004 at 12:12 AM
If you really feel you have to add a higher current relay then do so....to no avail. Whatever makes you happy. If brawling in the streets with relays makes you feel good---have at it---Ive seen hush puppies cause more damage.
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Someone pass me that bottle.
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