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## Re: what is the joule rating on surge protectors?

 Subject: Re: what is the joule rating on surge protectors? "bud--" 13 Aug 2006 14:52:34 -0700 sci.electronics.basics
 ```John Fields wrote: > >>>Nobody has yet answered my question: what are typical one-shot versus > >>>lifetime joule ratings for MOVs? > >> > >>--- > >>I don't think there _is_ a one-shot rating after which the device > >>has to be replaced. > > > >So any MOV can absorb a megajoule? > > --- > I don't think so, and I don't think that's what can be inferred from > what I said. > > John Popelish posted something interesting relating to your query. > Did you read it? > One of the parameters of a MOV is the Maximum Continuous Operating Voltage which is the voltage at which a MOV starts to conduct, specifically the voltage (on average - lot of individual variation) at which the current is 1ma. The MOV Joule rating is the single shot energy absorption that shifts the MCOV by 10% (lower) which can be considered a performance limit. At lower (but still relatively high) energy hits, the MOV can progressively degrade. With lower (but still relatively high) energy hits the MOV can have a much longer life. See w_'s post: http://www.littelfuse.com/data/en/Data_Sheets/CA.pdf Fig 7-11 which gives the number of pulses that can be absorbed (1 to 1 million) at different surge current vs duration combinations - from which surge energy can be calculated.. bud-- ```
 Current Thread Re: what is the joule rating on surge protectors?, (continued) Re: what is the joule rating on surge protectors?, John Fields Re: what is the joule rating on surge protectors?, John Larkin Re: what is the joule rating on surge protectors?, John Popelish Re: what is the joule rating on surge protectors?, John Larkin Re: what is the joule rating on surge protectors?, John Popelish Re: what is the joule rating on surge protectors?, John Larkin Re: what is the joule rating on surge protectors?, John Popelish Re: what is the joule rating on surge protectors?, Sjouke Burry Re: what is the joule rating on surge protectors?, John Popelish Re: what is the joule rating on surge protectors?, Rich Grise Message not available Re: what is the joule rating on surge protectors?, bud-- <= Re: what is the joule rating on surge protectors?, John Fields Message not available Re: what is the joule rating on surge protectors?, w_tom Re: what is the joule rating on surge protectors?, John Fields