Let's look at the replacement conditions of vacuum vacuum circuit breaker arc extinguishing chamber. Whether it needs to be replaced for reaching the end of its final date? How about the storage or service life of the vacuum arc extinguishing chamber exceeds the validity period specified by the product? After used for a long time, the vacuum arc extinguishing chamber should be replaced with the following situations.
(1) The storage period or service period of the vacuum circuit breaker arc extinguishing chamber exceeds the product validity period (calculated from the factory date of the vacuum arc extinguishing chamber) which is generally about 20 years.
(2) The vacuum degree of vacuum circuit breaker vacuum arc extinguishing chamber drops to 1.33×10-2Pa (the magnetron vacuum gauge can be used if necessary). If it is a glass shell vacuum arc extinguishing chamber, when the color of the metal shielding cover has changed obviously, the vacuum condition should be checked immediately.
(3) The contact wear of the vacuum circuit breaker vacuum arc extinguishing chamber accumulated more than specified value of the product using instructions that is 3 millimeters in general. Most products have allowable wear warning mark (point or line). When the contact wear accumulated more than 3 millimeters, the warning mark cannot be seen after closing.
(4) The number of rated short circuit current cutting off exceeds the electric life of the vacuum circuit breaker.
(5) The number of mechanical closing and dividing operations exceeds the specified value in the product manual.
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