Siemens GMSG Instruction Manual page 48

Maintenance
Figure 37: Typical vacuum interrupter contact life curves (continued)
Load graph "D" vacuum interrupter type VS-17085
Permissible operating cycles
100,000
50,000
20,000
10,000
5,000
2,000
1,000
500
200
100
50
20
10
48
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.
1 2 5 10
Breaking current (symmetrical value)
20 50 63 100