USB 5V able to hold a relay open?

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=76640
Printed Date: July 14, 2025 at 2:01 PM

Topic: USB 5V able to hold a relay open?

Posted By: projectsw1
Subject: USB 5V able to hold a relay open?
Date Posted: April 22, 2006 at 9:49 PM

Was just wondering if 5V could hold a regular SPDT open?

here's the best way i can describe what I'm asking:

1. Want to install a power invertor to run a computer

2. a switched 12V source would initially open a relay, powering the invertor

3. computer is powered up and the USB port has 5V (also hooked up to relay)

4. when I shut the car off, the USB port will hold the relay "open or ON"

5. computer shuts down, USB power drops, invertor turns off

is that possible?

Replies:

Posted By: bdl666
Date Posted: April 22, 2006 at 11:02 PM

You can use 5 volts relay to keep the other relay to the inverter energized until the computer shuts off.

Something like this :

https://rocky.digikey.com/WebLib/Omron%20Web%20Data/G5V-1.pdf

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