Toshiba JK Series Instruction Manual page 11

GENERAL DESCRIPTION
POWER CELLS WITH FIXED-TYPE
CONTACTORS - MAJOR COMPONENTS
A. Isolation Switch (Fig. 3)
Power is switched on and off by a fixed-
mounted, externally
isolation switch. When the switch is in the OFF
position, incoming power is isolated from the
power cell interior by an automatic shutter. For
additional safety, the load terminals of the switch
are automatically grounded when the switch is
OFF. When the external handle is operated, the
switch is closed and incoming power is applied
to the line side of the power fuses. In this
position, the motor or other load may be
switched on and off by operating the vacuum
contactor.
The isolation switch has a maximum interrupting
capacity of 0.4 amperes.
Do not connect additional
WARNING
load to the isolation switch.
B. Power Fuse Clips (Fig. 4)
Clips for three bolted-in power fuse cartridges
provide a mounting means for the current-
limiting fuses that provide primary short-circuit
protection for the controller and load circuit.
These fuse cartridge clips are connected
between the isolation switch and the vacuum
contactor.
C. Vacuum Contactor (Fig. 5)
The Type HCV-5HA/7HA vacuum contactor
used in these power cells is a compact, fixed-
mounted device. It is mounted to the floor of the
cell compartment, beneath the isolation switch.
Switching occurs entirely within vacuum bottles,
which results in long life with virtually no
maintenance. The contactor is mechanically
interlocked with the isolation switch so that the
switch may not be opened or closed unless the
contacts of the vacuum contactor are opened.
operated, three-pole
Fig. 3 Isolation Switch
Fig. 4 Power Fuse Clip (Fuses not included)
Fig. 5 Vacuum Contactor (Fixed Mount)
Page 7