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Will a 12v component work in a 24v environment?

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donjohnston

Joined: 13 Dec 2009
Posts: 231

Posted: Sat Mar 28, 2015 5:04 am Post subject: Will a 12v component work in a 24v environment?

The recent thread on relays got me wondering about something:



Is there something about a 12v relay or switch (basically mechanical components) that precludes it's use in a 24v system of the same or less current loads? 



Or put another way, a wire suited for 8 amps at 12v will be okay with 8 amps at 24v.  So it would that logic also apply to a switch or relay?

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yellowduckduo(at)gmail.co
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Posted: Sat Mar 28, 2015 5:40 am Post subject: Will a 12v component work in a 24v environment?

For the switch and for relay contacts, 12volts or 24 volts are 

interchangeable for practical purposes.



But not for a 12 volt relay coil. It's current is controlled by its 

resistance on our direct current systems. So twice the voltage means 

twice the current and four times the power (Power is volts time current 

which is heat). It will get hot and have a short life at twice the rated 

voltage.



Ken



On 28/03/2015 9:04 AM, donjohnston wrote:

 	  Quote: 	
		   



 The recent thread on relays got me wondering about something:



 Is there something about a 12v relay or switch (basically mechanical components) that precludes it's use in a 24v system of the same or less current loads?



 Or put another way, a wire suited for 8 amps at 12v will be okay with 8 amps at 24v.  So it would that logic also apply to a switch or relay?





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=439978#439978

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