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Effective July 2022

Instructional Leaflet 

IL0131196EN

Installation instructions for Castell key

interlock kit IZM low voltage

circuit breakers

m

 WARNING

(1) ONLY QUALIFIED ELECTRICAL PERSONNEL SHOULD 

BE PERMITTED TO WORK ON THE EQUIPMENT

(2) ALWAYS DE-ENERGIZE PRIMARY AND SECONDARY 

CIRCUITS IF A CIRCUIT BREAKER CANNOT BE 

REMOVED TO A SAFE WORK LOCATION 

(3) DRAWOUT CIRCUIT BREAKERS SHOULD BE LEVERED 

(RACKED) OUT TO THE DISCONNECT POSITION. 

(4) ALL CIRCUIT BREAKERS SHOULD BE SWITCHED TO 

THE OFF POSITION AND MECHANISM SPRINGS  

DISCHARGED.

FAILURE TO FOLLOW THESE STEPS FOR ALL 

PROCEDURES DESCRIBED IN THIS INSTRUCTION 

LEAFLET COULD RESULT IN DEATH, BODILY INJURY, OR 

PROPERTY DAMAGE.

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 WARNING

THE INSTRUCTIONS CONTAINED IN THIS IL AND ON 

PRODUCT LABELS MUST BE FOLLOWED.  OBSERVE 

THE FIVE SAFETY RULES. 

•  DISCONNECTING;
•  ENSURE THAT DEVICES CANNOT BE ACCIDENTALLY 

RESTARTED;

•  VERIFY ISOLATION FROM THE SUPPLY;
•  EARTHING AND SHORT-CIRCUITING; AND;
•  COVERING OR PROVIDING BARRIERS TO ADJACENT 

LIVE PARTS.

DISCONNECT THE EQUIPMENT FROM THE SUPPLY. 

USE ONLY AUTHORIZED SPARE PARTS IN THE REPAIR 

OF THE EQUIPMENT. THE SPECIFIED MAINTENANCE 

INTERVALS AS WELL AS THE INSTRUCTIONS FOR 

REPAIR AND EXCHANGE MUST BE STRICTLY ADHERED 

TO PREVENT INJURY TO PERSONNEL AND DAMAGE 

TO THE SWITCHBOARD.

General information

This key interlock provides the following  

safety features:

• 

With no key, the breaker is open and  

cannot close

• 

With the key ON (in cylinder) and rotated,  

the breaker is fully functional

• 

The key cannot be removed when the  

breaker is ON (closed). The key cannot turn  

the breaker OFF

ote: 

N

To remove the key, press the breaker OFF button, 

and rotate the key 90 degrees counterclockwise.

Required tools

• 

M10 socket with 1/4-inch drive 

• 

1-7/16-inch (36 mm) hole saw/drill

• 

#1 Phillips head screwdriver

• 

Flat blade screwdriver

• 

Needle-nose pliers

Kit parts identification

Refer to 

Figure 1

 for visual identification of the 

parts listed below:
(A) Interlock arm assembly
(B) Castell lock CL1019 with key CL1062— 

specify unique lock lettering code when ordering 

(Castell keylock not supplied)
(C) Castell keylock mounting plate
(D) Interlock adapter
(E) Hold-down bracket
(F) Torsion spring
(G) Spring pin
(H) Hex standoff
(I) Extension spring
(J) Adapter screw
(K) Standoff screw (1/8-inch shoulder)
(L) Interlock cable
(M) Retaining clip (M5 x 0.7)
(N) Interlock lever
(O) Lock mounting plate screw (three)
(P) Interlock lever screw (M3.5 x 10 tapping)

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