How Many Relays Can Be Triggered By One Output?

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iskidoo

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Joined: December 08, 2002

Location: Maine, United States

Posted: January 22, 2019 at 6:27 PM / IP Logged

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

Steve G

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iskidoo

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Joined: December 08, 2002

Location: Maine, United States

Posted: January 22, 2019 at 6:29 PM / IP Logged

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?

Steve G

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i am an idiot

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This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: January 22, 2019 at 7:38 PM / IP Logged

A typical Bosch / Now Tyco draws 160 milliamps. Make the alarm trigger 1 relay and make it trigger the 2 relays you need.

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iskidoo

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Joined: December 08, 2002

Location: Maine, United States

Posted: January 22, 2019 at 8:45 PM / IP Logged

Ok thank you guys for the suggestions. I appreciate it.

Steve G

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