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Old 05-30-2013, 07:57 PM   #161
Bluto
Senior Member
 
City: Dayton, OH
Country: USA
Join Date: Apr 2013
Posts: 195
Yes, they are the same in principle, but a relay is a light duty device for small loads, (I'd use them for stuff 10 amps or less) and wouldn't be the best choice for heaters, A/C units or microwaves. Contactors have contacts that can make and break thousands of times without getting stuck or causing problems.

http://ab.rockwellautomation.com/Mot...ntactors#/tab2

12 VDC might be a problem, not sure about that.
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