20
S&C Instruction Sheet 761-505
Installation
Installing Key Interlock
STEP 21.
The interlock group includes a Superior Type
B4003-1 Mk II single- or multiple-key interlock
(or equivalent), with zero bolt projection and
¾
-inch (19-mm) bolt travel, locking disc, and
interlock bracket. If “provision only” is specifi ed,
the interlock is not included.
Attach the key interlock to the interlock
bracket so the interlock bolt, when extended,
engages a slot in the locking disc on the operat-
ing handle. See Figure 23.
STEP 22.
Block one of the two slots in the locking disc
with the blocking screw provided. (The slot to be
blocked depends on whether a locked-open or
locked-closed arrangement is required.) See
Figure 24.
NOTICE
Key interlocks are intended for proper
sequencing of switch operations; they
are not intended to provide security. The
oper
ating handle assembly includes a
locking bar for padlocking the switch in
either the open or closed position.
Figure 23. Attaching the key interlock to the interlock
bracket.
Interlock bolt
Blocking screw
Figure 24. The blocking slot in the interlock disc.
