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How Many Relays Can Be Triggered By One Output?

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=145177
Printed Date: March 28, 2024 at 8:20 AM


Topic: How Many Relays Can Be Triggered By One Output?

Posted By: iskidoo
Subject: How Many Relays Can Be Triggered By One Output?
Date Posted: January 22, 2019 at 6:27 PM

I read this in the relay section...
The coil of an SPDT or an SPST relay that we most commonly use draws very little current (less than 200 milliamps)

Also this...
A single output connected to multiple relays will allow you to open continuity and/or close continuity simultaneously on multiple wires.

So I'm currently using my 250mA GWR output to trigger a relay that forces my truck's blower to high when remote started. I want to add another relay to turn my radio ignition wire off while remote started. Can I safely trigger the 2nd relay using the same output or will that overdrive the GWR output and burn it out?

Thanks, Steve

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Steve G



Replies:

Posted By: iskidoo
Date Posted: January 22, 2019 at 6:29 PM
Basically I'm wondering if the relay needs close to 200mA to trigger or significantly less, and roughly how much does each relay draw just to trigger it?

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Steve G




Posted By: i am an idiot
Date Posted: January 22, 2019 at 7:38 PM
A typical Bosch / Now Tyco draws 160 milliamps. Make the alarm trigger 1 relay and make it trigger the 2 relays you need.




Posted By: iskidoo
Date Posted: January 22, 2019 at 8:45 PM
Ok thank you guys for the suggestions. I appreciate it.

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Steve G





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