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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
Figure 2. Switch Nameplate
Maximum
3 Phase 60 Hz
Fault Close and Momentary,
Continuous and Load Break
Asymmetrical
(2 seconds)
Replacement fuses shall be of
the same manufacture, type,
and interrupting rating.
IEEE C37.20.4 ANSI C37.58
Instructions
Mfd At:
Fuse Type
Short-Time
BIL
1A33788H02
ANSI C37.22
Style
Date
Type
Fused Fault Close,
Asymmetrical
Load Interrupter Switch
Current Ratings, A
Industry Standards
Voltage Ratings, kV
Safety features
Type MVS load interrupter switchgear has several built-in features to
reduce hazards and to provide proper operating sequences.
WARNING
EXCEEDING THE NAMEPLATE RATINGS OF MVS SWITCHGEAR MAy CAUSE
PROPERTy DAMAGE, SEVERE INJURy, OR DEATH. MVS SWITCHGEAR
MUST BE OPERATED WITHIN ITS NAME-PLATED RATINGS.
1. A door interlock prevents opening the enclosure front door while
the switch is in the “Closed” position.
2. A switch interlock prevents manual operation of the handle
mechanism with the door open.
3. A viewing window is provided to visually verify the switch
contact position.
4. Facility is provided for padlocking the switch in the “Open” or
“Closed” position.
5. Facilities are provided for padlocking the door handles closed.
6. Mechanical indicators show whether the switch mechanism is
“Open” or “Closed.”
7. Key interlocks, when provided, force a sequence of operation.
CAUTION
OPERATING AN MVS SWITCH WITH A KEy INTERLOCK BOLT EXTENDED
WILL RESULT IN EQUIPMENT DAMAGE AND MAy ALSO EXPOSE THE
OPERATOR TO BODILy INJURy OR DEATH. THE KEy MUST BE INSERTED
INTO THE INTERLOCK AND ROTATED TO RETRACT THE LOCKING BOLT
BEFORE OPERATING AN MVS SWITCH.
Safety practices
Only qualified electrical workers with training and experience on high
voltage circuits should be permitted to work on this equipment. They
should be familiar with the work to be performed, the safety
equipment required, and the hazards involved.
1. Read and fully understand these instructions before attempting
any assembly, operation, or maintenance of this switchgear.
WARNING
EXCEEDING THE NAMEPLATE RATINGS OF MVS SWITCHGEAR MAy CAUSE
PROPERTy DAMAGE, SEVERE INJURy, OR DEATH. MVS SWITCHGEAR
MUST BE OPERATED WITHIN ITS NAME-PLATED RATINGS.
2. Disconnect all power sources before making any adjustments or
performing maintenance.
3. After opening the switch and before opening the door, use the
viewing window to ensure that all three switch blades are open.
If necessary, use a flashlight to verify that all three contacts
are open.
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