36
Figure 19: Typical vacuum interrupter contact life curves
100,000
50,000
20,000
10,000
5,000
2,000
1,000
500
200
100
50
20
10
Permissible operating cycles
Breaking current (symmetrical value) (kA)
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
1
2
5
50
100
10
20
40
A
25
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.
B
C
