From: curd@notformail.com   
      
   On Mon, 07 May 2018 16:59:18 -0400, default wrote:   
      
   > I don't ever remember seeing duty cycle as a spec on any relays.   
      
   That's why I put it in inverted commas! The essence of it is, you will   
   have no trouble provided you energise your solenoid in well-spaced, short   
   bursts. Used that way it should last for years. If you hold it constantly   
   on, however, it'll burn out within 2-3 minutes.   
      
   > Current and voltage for the contacts, nominal voltage for the coil and   
   > must make must release voltages, and mechanical/environmental, number of   
   > cycles, are all the specs you usually get.   
      
   Some people think they can save a small fortune by using auto solenoids   
   in place of the correct ones in applications like winches. They don't   
   realise it's the extended 'on' time capability that you're paying for.   
   Auto starter solenoids are NOT designed for what amounts to continual   
   duty and the manufacturers simply assume (not unreasonably) that you will   
   not use them for anything other than their stated purpose!   
      
      
      
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