Guest 4electros Posted May 24, 2006 Report Share Posted May 24, 2006 does relay (12v) work on 9v or it does only on 12v? what about relay working? Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 24, 2006 Report Share Posted May 24, 2006 does relay (12v) work on 9v or it does only on 12v? what about relay working?Look at its datasheet!Most relays work with 80% or 75% of their listed voltage. A 12V relay is not reliable with a 9V battery for power because the 9V drops to 6V as it runs down. Quote Link to comment Share on other sites More sharing options...
ante Posted May 25, 2006 Report Share Posted May 25, 2006 Hi Guys,Note that the maximum load will also be affected by the switching time (on) which increases with a lower coil voltage. Quote Link to comment Share on other sites More sharing options...
SM2GXN Posted May 25, 2006 Report Share Posted May 25, 2006 You are so right Ante ;) Just an add to this discussion, check this article on how to reduce power dissipation in relays and solenoids, interesting don't you think? http://www.elecdesign.com/Articles/ArticleID/11162/11162.html Quote Link to comment Share on other sites More sharing options...
Guest 4electros Posted May 26, 2006 Report Share Posted May 26, 2006 another question, my relay with two-contacts is working on certain polarity then not work on the reverse polarity (i mean to the coil of relay), i didn't know about polarity-dependent relay, is that really happens?please , i need some comments about that! Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 26, 2006 Report Share Posted May 26, 2006 Yes, some relays have a polarized coil. They also have a magnet inside to make them more sensitive.Why not look at the datasheet for your relay and learn everything about it.Then look at the catalog of a huge supplier and see all the different kinds of relays. Quote Link to comment Share on other sites More sharing options...
Guest 4electros Posted May 27, 2006 Report Share Posted May 27, 2006 thanks for your reply.I've searched previously for the datasheet of my relay and couldn't find it, i might not detect the right type in search field....i can note some writings on my relay:NAiSJW2SN-DC12VAJW7211made in thailanddoes that help?! Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 27, 2006 Report Share Posted May 27, 2006 Your relay has a 12V coil and might be made by a company called "Nais".You don't know the rating of its contacts so what good is it? It might be a fire hazzard if you use it to switch the mains. Quote Link to comment Share on other sites More sharing options...
MP Posted June 3, 2006 Report Share Posted June 3, 2006 Your relay is made by Panasonic. It is a 12 VDC / 5A relay. Here is a link to the data sheet that will help you understand the markings on the case and what they mean.http://www.alliedelec.com/Images/Products/Datasheets/BM/AROMAT/Aromat_Industrial-Control_7881012.pdfMP Quote Link to comment Share on other sites More sharing options...
bibinjohn Posted July 1, 2006 Report Share Posted July 1, 2006 ya the relay of 12V should have a voltage greater than 12V. See this linkhttp://booksbybibin.14.forumer.com/viewtopic.php?t=33Bibin Johnwww.bibinjohn.tk Quote Link to comment Share on other sites More sharing options...
MP Posted July 2, 2006 Report Share Posted July 2, 2006 That is not actually true. The first step is to check the data sheet for the relay you are using. If you are using a 5 volt relay with a 6 volt maximum allowed, you are slowly killing the relay by using 6 volts. You also have the worry of surges on the circuit causing the voltage to fluctuate. In this case, you would see a premature failure of the relay when the voltage passes the max rating. The only reason that a circuit might appear that you need more voltage than specified of the relay is if you are asking for too much current through your relay. Then there is a voltage drop. In this case, the correct solution is to get a relay that will handle the current required and stay with the correct voltage rating.MP Quote Link to comment Share on other sites More sharing options...
kachew Posted September 5, 2006 Report Share Posted September 5, 2006 dear MP,then what you means is when we want to use relay for 12V circuit with power rating of 200W, the we should choose relay rating of 12V and 20A? because 200/12V??thanks for your reply Quote Link to comment Share on other sites More sharing options...
MP Posted September 5, 2006 Report Share Posted September 5, 2006 You are on the right track kachew. All relays list a relay coil resistance. Just use ohm's law. You should come up with the same values as the manufacturer through calculation.MP Quote Link to comment Share on other sites More sharing options...
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