Discuss 12v ac relay not pulling in in the Electrical Forum area at ElectriciansForums.net

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Hi I've installed a 12v ac relay but the 12v supply won't pull the relay coil in. It gets it signal from a disabled alarm kit. Multimeter shows a healthy 12v when alarm is activated but relay won't energise. Tried a couple of different relays but no joy. ????
 
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O

oldtimer

Make sure the coil is not too big for the supply it could be you have the right coil but the supply 12v may not be big enough
 
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  • #4
Its difinetly a 12v AC coil. Perhaps the coil is too big for the 12v. Anyway I can overcome this.
 
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  • #6
Not indicated anywhere on the kit but according to the meter its 12v AC.
 
O

oldtimer

You dont indicate what you are switching with the relay ? remember the alarm 12vac wil be jus enough to switch the electronics

More information is required
 

HandySparks

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Make sure the coil is not too big for the supply it could be you have the right coil but the supply 12v may not be big enough
You'd get some clue by looking at the voltage across the coil when its energised. If it's significantly lower than 12V, say less than 10V, then you may need a relay with a higher coil resistance. The relay spec sheet should say what the minimum voltage for pull-in is.
 
What about a Solid State relay, RS have some that will switch 4A with a 10mA "coil" current.
 
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  • #10
All I want to switch is a volt free closed contact to alert a pager.
 
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