GENERAL DESCRIPTION
Page 19
G. Operating Handle
The external operating handle shown in Fig. 20
is used to control the operation of the isolation
switch. Moving the handle upward turns the
switch on, thus applying incoming power to
the current-limiting fuses on the withdrawable
carriage. The withdrawable contactor carriage
can neither be inserted nor removed when the
operating handle is in the “on” position.
Moving the handle down opens the isolation
switch, de-energizing all medium voltage
incoming power to the controller compartment.
At the same time an automatic shutter within
the switch closes providing an effective barrier
between the controller compartment and the
incoming supply. The opening of the switch
also causes the line side of the power fuses to
be grounded.
Fig.
Operating Handle
H. Interlocks Mechanical
a.
Door Interlock
A mechanical interlock is provided to prevent
opening or closing the medium voltage
compartment door unless the switch operating
handle is off (Fig. 21).
Fig. 21 Door Interlock
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