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Figure 19: Typical vacuum interrupter contact life curves
Permissible operating cycles
36
100,000
50,000
20,000
10,000
5,000
2,000
1,000
500
200
100
50
20
10
1
2
Breaking current (symmetrical value) (kA)
Note: Right-hand vertical segment of curve is located at the maximum
symmetrical interrupting current rating of the circuit breaker, as indicated in
Table 4: Typical vacuum interrupter contact expected life on page 35.
Load graph "A" vacuum interrupter type VS-25008
Load graph "B" vacuum interrupter type VS-15052
Load graph "C" vacuum interrupter types VS-30030 and VS-30041
A
20
25
5
10
B
C
40
50
100
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