25
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
electromechanical stored energy release
(shunt trip)
Description
The stored energy release feature of the MVS load interrupter switch
allows the operator to manually compress the main operating spring
storing the spring energy to “Open” or “Close” the switch upon
lifting the trigger latch . When the latch is released, the stored
energy in the main operating spring is released to rotate the main
shaft to “Close” or to “Open” the switch (see
Figure 35
) . This
feature is only available on 4 .76 kV or 15 kV class MVS switches .
Table 7. MVS Switch Electromechanical Stored Energy Release
Coil Data. Tolerancee: ± 15% Vac or Vdc
nominal Voltage
e/r amperes
120 Vac
11.2
240 Vac
7.4
50 Vdc
7.4
125 Vdc
5.0
250 Vdc
2.5
240 Vac capacitor trip
2.5
Figure 34. Stored Energy Mechanism
WARNING
DEVIATING FROM THE WARNING LABEL ON SWITCHGEAR WILL RESULT
IN EQUIPMENT DAMAGE AND MAy ALSO EXPOSE A PERSON TO BODILy
INJURy OR DEATH.
FOLLOW EXACTLy THE OPERATING INSTRUCTIONS ON THE LABEL.
CAUTION
CHANGING THE SWITCH POSITION WITH THE SWITCH OPERATING
HANDLE WILL RESULT IN DAMAGE TO THE SWITCH.
IF THE SWITCH STATUS NAMEPLATE INDICATES THAT THE SPRING IS
CHARGED, THE TRIGGER LATCH MUST BE RELEASED TO CHANGE THE
POSITION OF THE SWITCH.
Charging the spring to “Close” or “Open” the switch
To initiate the opening or closing action, the handle is inserted into
the handle casting and is rotated upward for the closing action and
downward for the opening action through an angle of 120 degrees .
The switch main operating spring is now charged and the trigger
latch is ready to be released to “Open” or “Close” the switch .
Closing the switch
Starting conditione:
The switch is “Open” and the spring has been
charged by the action described above (see
Figure 35
) .
When the trigger latch is lifted upward, either manually or by the
action of the trigger coil, the blocking mechanism is released,
permitting the switch to “Close .” The final result is a “Closed” switch
with the operating spring in an uncharged condition
(see
Figure 36
) .
Opening the switch
Starting conditione:
The switch is “Closed” and the spring has been
charged by the action in described above (see
Figure 37
) .
When the trigger latch is lifted upward, either manually or by the
action of the trigger coil, the blocking mechanism is released
permitting the switch to “Open .” The final result is an “Open” switch
with the operating spring in an uncharged condition (see
Figure 35
) .
