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Instructional Leaflet 

IL0131196EN

Effective July 2022

Installation instructions for Castell key 

 interlock kit IZM low voltage

 circuit  breakers

EATON 

www.eaton.com 

Step 6: 

Assemble the interlock cable 

(L)

, hex standoff 

(H)

, and  

the interlock adapter 

(D)

 with the adapter screw 

(J)

 and standoff 

screw 

(K)

.

Figure 6. Step 6

Step 7: 

Mount the assembly from 

Step 5

 to the assembly  

from 

Step 6

 as shown. Note the key alignment orientation with  

the standoff.

Figure 7. Step 7

Step 8: 

Mount the torsion spring 

(F)

 and the hold-down bracket 

(E)

 

to the assembly from 

Step 7

 using spring pin 

(G)

, and the flathead 

screw from the lock assembly. Note the spring winding direction as 

shown in the side view.

Figure 8. Step 8

Cable (L)

Standoff 

screw (K)

Hex 

standoff 

(H)

Interlock 

adapter (D)

Adapter 

screw (J)

Note 

orientation

Hold-

down 

bracket 

(E)

Side view

Spring pin (G)

Torsion spring (F)

Step 9: 

Mount the assembly from 

Step 8

 to the breaker as  

shown using three lock plate mounting screws 

(O)

. Connect  

the extension spring 

(I)

 between the interlock arm assembly  

and the mounting plate as shown. 

Figure 9. Step 9

Step 10: 

Turn key assembly 

clockwise

 to create slack during this 

cable installation. Replace the interlock lever 

(N)

, and capture in 

place with the retaining clip 

(M)

. Attach the interlock cable with  

the interlock lever screw 

(P)

.

Figure 10. Step 10

Extension 

spring (I)

Mounting 

screws (O)

Retaining clip (M)

Interlock lever (N)

Interlock lever 

screw (P)

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