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TOSHIBA
Vacuum
interrupter
1 2 .
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 ele'ctrode 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 .Omm 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.
Hence, parts should be replaced around
Table 7
Parts
Table 8 Electrical service life
Auxilia
Drive t
Movab
C O N T A C T
Fig.8 Parts to be inspected
Gap/wipe standard value
W A S H E R (b.48)
17
I
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