Ken, Rule of thumb which hopefully is accurate:
MOV's have a discrete lifetime (like 10 cycles at full rating) before they're gone. In order of joules absorbed versus package size: Glass tubes, MOV's, silicon (from huskiest to weakest) For turn on time: silicon, MOV's, glass tubes (from fastest to slowest) The glass tubes absolutely take a discrete amount of time before they're "on" The voltage across the MOV's can really go very high as they're coming on - like 3 times they're rating voltage. The overshoot depends upon the rise time of the incoming. Performance in the system depends a great deal upon the lead length, layout etc for real effectiveness. - Robert - -----Original Message----- From: Ken Javor <ken.ja...@emccompliance.com> To: emc-p...@majordomo.ieee.org <emc-p...@majordomo.ieee.org> List-Post: emc-pstc@listserv.ieee.org Date: Tuesday, January 11, 2000 3:32 PM Subject: transient suppression > >When choosing transient suppression for power line input to equipment, what >are the choices (MOVs, silicon TVS, glass discharge tubes, others) and what >are the trade-offs? Thank you. > --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).