Toshiba JK Series Instruction Manual page 12

GENERAL DESCRIPTION
D. Interlocks – Mechanical
The isolation switch is mechanically interlocked
with the vacuum contactor and the compartment
door. Three separate interlocks are provided, as
described below.
a. Door Interlock Bracket
A door interlock bracket is provided to prevent
opening or closing
compartment door unless the switch operating
handle is OFF. The bracket (Fig. 6) is furnished
loose with the power cell and it is the
responsibility of the OEM to mount it to the
enclosure door in the proper location. Refer to
the INSTALLATION section for mounting details.
b. Handle Interlock to Door
A mechanical interlock is provided which
prevents moving the handle from OFF to ON
unless the compartment door is closed (Fig. 7).
This interlock is actuated by the upper part of the
door interlock bracket described in item a.
above.
c. Handle Interlock to Vacuum Contactor
The vacuum contactor
interlocked to prevent it from closing unless the
switch handle is in the fully ON or fully OFF
position. The interlock shown in Fig. 8 provides
this function.
If the switch handle is in an intermediate
position, and a closing signal is given to the
contactor, it is mechanically prevented from
operating by the interlock.
This interlock also prevents the switch handle
from being moved in either direction unless the
contacts of the vacuum contactor are opened.
the medium voltage
is mechanically
Fig. 6 Door Interlock Bracket
Fig. 7 Handle Interlock to Door
Fig. 8 Handle Interlock to
Vacuum Contactor
Page 8