MOV Surge Suppressors IMPORTANT SAFETY INFORMATION

If you are using an MOV type surge suppressor or are considering their use, please read the following:

• MOVs wear out and must be replaced every 6 months to 3 years depending on the surge environment. The "protection working light" is proof the manufacturer expects their product to fail, making their use a real gamble!
• Failed MOVs may flame, smoke, or open a fuse, removing power from critical equipment.
• Most MOV suppressor ratings are based on calculations, not actual endurance testing.
• MOVs used in "all three modes" actually endanger networked equipment, and can degrade audio, video and computer signals.

SAFETY PRECAUTIONS

• Avoid using suppressors in plastic housings. Metal housings will impede MOV fires better.
• Do not place MOV suppressors on carpeting, near curtains or other flammable surfaces.
• Shake the suppressor periodically and listen for loose parts. Discard if it rattles.
• If the housing has burn marks (soot, discoloration), discard immediately.

Check with Underwriters Laboratories to see if a manufacturer has had its products tested for endurance and performance as well as safety (UL1449 Adjunct Classification program). Simply click here to link to UL’s certification page, put in any surge suppressor manufacturer’s name under Company Name/Location, click "search" and select the category for surge suppressors (TVSS). Scroll to see if any numbers are listed in the three Adjunct Classification columns. The best products are Grade A endurance (1,000 surges), Class 1 performance (330V SVR), Mode 1 for applications. Zero Surge’s series mode surge suppressors achieved that highest rating in 1996. If a product is not rated for performance and endurance, their use is simply a dangerous gamble.

Additional safety information:

• National Lightning Safety Institute: Recommendations for surge protection devices.
• Bellingham Fire Department: Surge Suppressors (MOV fires)
• University of Washington Environmental Health and Safety: Surge Suppressors

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