From: michaelnikolaou_remove_me_@yahoo.com   
      
   Hi to newsgroup   
      
   I have a problem that needs some assistance.   
   I have a 220V 50 HZ industrial relay at 20 amps.   
   The arming inductor  is rated at 6 watts . I need to   
   use a varistor as surge arrester but i don't know to   
   calculate the energy that will be produced and the   
   varistor ratings . As i understand it must be rated for   
   275 VAC rms.But how is the current capability related   
   and the energy (joules) that it is rated .Is there a rule   
   of thumb for such calculations ?.   
   Any help would be apprecciated .   
      
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