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: May 06, 2025 at 1:19 PM
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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