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Parts name
Vacuum
interrupter
12．CRITERIA FOR DURABILITY
(1) Electrical service life
The electrical service life of the vacuum interrupter is defined by the electrode wear the
number of open/close operations (mechanical life).
To determine the electrode wear, measure the gap between the lever and washer
(dimension A) in a closed start , as shown in Figure8. With the vacuum interrupter
closed, if a contact wear gauge or a 1.0mm thickness gauge cannot be inserted ,
this means the end of life is reached.
For the components listed below, replacement or detailed inspection and cleaning
are recommended after the indicated number of operations.
Vacuum interrupter
Auxiliary switch
Drive unit
Movable conductor
Hence, parts should be replaced around electrical service life operations.
ＣＯＮＴＡＣＴ ＳＰＲＩＮＧ
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Table 7
Gap/wipe standard value
Gap
Normally
energized
7.0～7.5
type
7.0～7.5
Latch type
Table 8 Electrical service life
Parts . name
ＷＡＳＨＥＲ（Ｍ８）
Fig.8 Parts to be inspected
-
１９ -
Wipe
More than 3.0
More than 2.8
Electrical service life
100,000 operations or 15 years
100,000 operations or 10 years
100,000 operations or 10 years
100,000 operations or 15 years
ＬＥＶＥＲ
6F9G0154
(mm)
Allowable wear
2.0
1.8
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