GE Industrial Solutions Power-Vac ML-20 Mechanism - Manual (Page 20)

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SECTION 13—Opening and Closing Speed
The opening speed is modified by moving the spring adjusting
nuts on the opening spring assemblies. A change in opening
speed affects the closing speed. Reference Figure 12.
The operating speeds for a 5 cycle breaker are as follows:
Operation Operation Operation Operation Feet Per Second Feet Per Second Feet Per Second Feet Per Second
Open 4.3 - 5.6
Close 2.6 – 3.9
V.I. STOP CENTER PHASE
Figure 12 Contact gap adjustment