Figure 37: Typical vacuum interrupter contact life curves (continued)
Load graph "D" vacuum interrupter type VS-17085
Maintenance
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)
1 2 5
50 100
10
20 63
Note: Right-hand vertical segment of curve is located at the maximum symmetrical
interrupting current rating of the circuit breaker, as indicated in Table 3: Typical
vacuum interrupter contact life and stroke on page 44.
48
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