Eaton MVS - Switch Adjustments; Main Blade Alignment

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Instructional Booklet IB02102006E
Effective May 2011
Type MVS (previously WLI)
metal-enclosed switchgear—
4.76 kV, 15.0 kV, 27.0 kV, and 38.0 kV
EATON CORPORATION www.eaton.com
Step 2: Check to see that the blades are fully closing. To do this,
measure the distance from the end of the break jaw to the front
edge of the blade. This dimension should be 0.10 to 0.30 inches
(2.54 to 7.62 mm). Should adjustment be required, loosen the
bolt holding the drive rod to the shaft and adjust the blade travel.
Re-tighten the bolt to 25 ft-lbs (33.90 Nm) (see Figure 27).
Figure 26. Break Jaw and Blade Clearances
In the “Open” position, the clearance between the edge of the
main blade and the break jaw should be as listed in Table 4
(see Figure 27). The top stop bolt adjusts this dimension.
Table 4. Main Blade to Break Jaw Clearances
Open Gap Dimension
Inches (mm) kV Class
6.625 ± 0.125 (168.28 ± 3.18) 4.76
6.625 ± 0.125 (168.28 ± 3.18) 15
11.00 ± 0.125 (279.40 ± 3.18) 27 or 38
0.125–0.281
Figure 27. Open Gap Distance
Step 3: If the switch is equipped with key interlocking, care must be
taken when replacing the switch mechanism cover to ensure that
it is properly repositioned. Elongated holes in the MVS side sheet
allow for vertical adjustment. The key interlock bolt must clear the
“Open-Closed” indicating cam casting when retracted.
Main blade alignment
For the following procedure, refer to Figure 28.
Figure 28. Main Blade and Flicker Blade Alignment