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

 Subject: Re: what is the joule rating on surge protectors? John Fields Sun, 13 Aug 2006 17:09:21 -0500 sci.electronics.basics
 ```On 13 Aug 2006 14:52:34 -0700, "bud--" wrote: > >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.. --- Excellent data sheets, thanks. -- John Fields Professional Circuit Designer ```
 Current Thread Re: what is the joule rating on surge protectors?, (continued) 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