2
Installation instructions for Castell key
interlock kit IZM low voltage
circuit breakers
EATON
www.eaton.com
Instructional Leaflet
IL0131196EN
Effective July 2022
(A)
(B)
(C)
(D)
(E)
(G)
(I)
(J)
(H)
(F)
(P)
(L)
(O)
(M)
(K)
(N)
Figure 1. Contents of kit
Installation of key interlock
Proceed with the following steps:
Step 1:
Remove the front cover of the breaker by loosening four
mounting bolts (six bolts if four-pole breaker), and hold the charging
handle down approximately 45 degrees to simplify removal.
Step 2:
Remove plug from keylock hole. If hole does not exist, drill a
1-7/16-inch (36 mm) hole using existing countersink on inside of cover
as a pilot guide. Use a hole saw such as a Starrett #KAVH0176.
Figure 2. Steps 1 and 2
Step 3:
If there is an operations counter and operation spring
installed, remove and save these items for later re-installation.
Remove existing counter/lock mounting plate and discard it.
Figure 3. Step 3
Bolt
Operations
counter
Mounting
plate
Step 4:
Snap the interlock arm assembly
(A)
into place on the shaft
as shown.
Figure 4. Step 4
Step 5:
Remove existing screws from the back of the lock
cylinder
(B)
, and use one screw to mount the lock cylinder to the
mounting plate
(C)
. Note the orientation of the key in this step and
subsequent steps, and the orientation of the slot in the lock cylinder
when mounting to the lock mounting plate.
Figure 5. Step 5
Shaft
Breaker swing arm
Interlock arm
assembly (A)
Metal spring arm
of interlock arm
assembly fits behind
breaker swing arm
Install only finger
tight—will be
adjusted later
Castell keylock (B)
(not supplied)
Castell keylock
mounting plate (C)
Lock
cylinder
slot
Orientation (key
should be inserted
into lock cylinder
slot for Step 5)
