[Amps] AC to DC

Barrie Smith barrie at centric.net
Mon Jan 30 22:06:06 EST 2006


>
> At 10:24 AM 1/30/2006, David C. Hallam wrote:
>
>>Bill states that an AC relay will
>>operate without damage at a DC voltage of about 70% of its rated AC.

> I'd be careful of generic statements like that. You're likely to come
> across a relay where that is not true. Use it as a starting point and
> test it carefully.
>
> 73, Bill W6WRT

All (quite a number, actually) of the 120 volt AC relays I've tried and 
tested have not closed at 12 volts DC, not even with help.  Many will close 
at about 18 to 20 volts, some needing a nudge.  All will close at what 
appears to be proper speed at 26 volts DC.

None exhibited over-heating.

73, Barrie, W7ALW 




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