4
Instruction Leaflet
IL2C13761H11
Effective March 2020
Installation instructions for Kirk
Key Interlock Kit (2C12891G21) in
Magnum low-voltage circuit breakers
EATON
www.eaton.com
Step 5:
Mount interlock assembly to rear of key lock with two
#3-48 x 3/8 inch long flathead screws
(K)
.
IMPORTANT
DO NOT INSERT KEY.
Key lock
assembly
#3-48 x 3/8
Screws
(K)
Interlock
assembly
Figure 6. Step 5
Step 6:
Using pliers, wind free leg of torsion spring
(D)
clockwise
approximately 360 degrees, and hook under lip of interlock adapter
as shown.
Torsion spring leg shown
installed under lip of
interlock adapter
Wind spring in
this direction
Figure 7. Step 6
Step 7:
Check that the breaker is “OPEN” and discharged. Using
the 10 mm socket and 1/4 inch driver, remove the front cover of
the breaker by loosening four mounting bolts (six bolts if four-pole
breaker), and holding the charging handle down approximately
45 degrees to simplify removal.
Step 8:
Remove plug from key lock hole. If hole does not exist, use
a 1-7/16 inch (36 mm) hole saw to drill a hole using existing drill point
countersink on inside of cover as a pilot guide.
Key lock hole
location
(drill
point locator
is molded
on inside of
cover)
Mounting bolts
Figure 8. Steps 7 and 8
Step 9:
Remove existing key lock mounting plate (if installed)
from the universal mounting bracket and discard it. If there is an
operations counter mounted to it, remove it before discarding and
save for
Step 13.
Matching
screws
Operations
counter
Key lock
mounting
plate
Universal mounting
bracket
Figure 9. Step 9
