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Effective July 2022
Instructional Leaet IL0131195EN
CES key interlock kit in 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.
m 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.
Section 1: 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
•1/4-inch drive socket
•10 mm socket
•#2 Phillips head screwdriver
•Adjustable crescent wrench
•Needle nose pliers
•3 mm wrench
•Small blade screwdriver
•Spring puller (such as Moody Tool item #6HAR6)
Kit parts identification
Refer to Figure 1 for visual identification of the
parts listed below:
(A) Interlock arm assembly
(B) CES lock #5256E with CES Key
(CES keylock not supplied)
(C) Bushing
(D) Lock mounting plate
(E) Torsion spring
(F) Interlock adapter assembly
(G) Retainer nut
(H) M3.2 retaining ring
(I) Cable assembly
(J) M3 x 6 self-thread screw (three)
(K) Extension spring
(L) Hex standoff
(M) Trip lever (only used if necessary)
ote: N Used only when necessary to replace an existing
older design trip lever.
(N) Trip lever screw
(P) Adapter plate
(Q) and (R) Standoff mounting screws
(S) Adapter plate screws (two)
2
CES key interlock kit in IZM
low voltage circuit breakers
EATON www.eaton.com
Instructional Leaflet IL0131195EN
Effective July 2022
Figure 1. Contents of Kit
ote: N A number of graphics in this instruction leaflet use the standard frame
(IZM32) circuit breaker for illustrative purposes only. The double frame circuit
breaker (IZM63) is handled in a similar fashion. Some components, such as
the trip unit, are not shown for clarity.
Section 2: Installation of key interlock
Proceed with the following steps:
Step 1: Check that the breaker is OPEN and discharged. Using
10 mm socket, 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.
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
(A)
(B) (C)
(D) (E) (F)
(G)
(H)
(I)
(J)
(K)
(L)
(M)
(N)
(P)
(Q)
(R)
(S)
Key lock hole location
(drill point locator
is molded on inside
of cover)
Bolts
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: Place bushing (C) on keylock body (B). Note orientation of
keylock and mount to lock mounting plate (D) with hex nut supplied
with lock. Discard other hardware supplied with keylock—collar, small
hex nut, cam arm.
Figure 5. Step 5
Step 6: Place torsion spring (E) on rear of keylock. The leg of the
spring fits into hole in lock mounting plate assembly above keylock
mounting nut.
Figure 6. Step 6
Step 7: Place interlock adapter assembly (F) on rear of keylock.
Figure 7. Step 7
Shaft
Interlock arm
assembly (A)
breaker swing arm
Metal spring arm
of interlock arm
assembly fits behind
breaker swing arm
Bushing (C)
Hex nut from
keylock
CES lock
mounting plate (D)
CES
keylock (B)
Torsion spring (E)
Fit leg of spring
into hole
Interlock adapter
assembly (F)
Note
orientation
3
Instructional Leaflet IL0131195EN
Effective July 2022
CES key interlock kit in IZM
low voltage circuit breakers
EATON www.eaton.com
Step 8: Screw retainer nut (G) onto rear of keylock assembly.
Figure 8. Step 8
Step 9: Using pliers, wind free leg of spring counterclockwise
approximately 100 degrees and hook onto leg of interlock adapter
as shown.
Interlock adapter
assembly (F)
Interlock adapter
assembly (F)
Hook spring leg
thru hole
Wind free spring
leg around
to hook onto
adapter leg
Figure 9. Step 9
Step 10: Attach adapter plate (P) to keylock assembly with adapter
plate screws (S).
Figure 10. Step 10
Step 11: Mount the hex standoff (L) and cable assembly (I) with the
hex standoff mounting screw (Q) and screw (R) as shown.
Cable assembly (I)
Hex mount
screw (Q)
Hex mount screw (R)
Hex
standoff
(L)
Figure 11. Step 11
Retainer Nut (G)
Retainer nut (G)
Adapter plate (P) Adapter plate
screws (S)
Retainer nut (G)
Step 12: Mount lock assembly to back side of universal mounting
bracket with three M3 screws (J) provided with kit and torque to
10–12 in-lbs (1.1–1.3 Nm).
Figure 12. Step 12
Step 13: Connect extension spring (K) between interlock arm
assembly (A) and mounting plate (D). Attach one end of the spring
to the interlock arm assembly such that the free end of the spring is
facing downward, as shown.
m IMPORTANT
FAILURE TO INSTALL EXTENSION SPRING AS SHOWN WILL
CAUSEMALFUNCTION OF THIS KIT.
Figure 13. Step 13
Step 13a: Using a spring hook or similar tool, hook the free end of
the spring and rotate it 90 degrees clockwise. The open end of the
spring hook should be facing inward toward the mechanism.
Figure 14. Step 13a
Lock plateassembly tab
Mounting
plate screws
(J)
Interlock adapter tab
Interlock arm
assemblyg (H)
Extension spring (K)
4
CES key interlock kit in IZM
low voltage circuit breakers
EATON www.eaton.com
Instructional Leaflet IL0131195EN
Effective July 2022
Step 13b: Pull the spring through and attach to the mounting plate,
as shown.
Figure 15. Step 13b:
m IMPORTANT
ATTACHING THE SPRING IN THIS MANNER WILL CAUSE MALFUNCTION OF
THIS KIT.OF THIS KIT.
The spring SHALL NOT be mounted in this orientation.
Figure 16. Incorrect spring mounting
Step 14: If it is necessary to replace the existing trip lever, remove
the existing E-Clip (retaining ring) from shaft of mechanism, and slide
old trip lever off of mechanism shaft. Slide new trip lever (M) onto
mechanism shaft. Fasten lever in place with M3.2 retaining ring (H)
as shown. Attach remaining end of cable assembly to mounting hole
on trip lever with trip lever screw (N).
Figure 17. Step 14: Reinstall the front cover.
Step 14a: Note operation of trip lever when rotating key. When
the key is rotated clockwise to the vertical position, the trip lever is
pulled down, which locks out the breaker..
Figure 18. Step 14a: Reinstall the front cover.
Step 15: If the breaker includes an operations counter, install it to
the back of the lock mounting plate with two M3.5 x 8 mm self-
tapping screws. Refer to Operations Counter IL for installation
instructions.
Step 16: Before reinstalling front cover, perform the following
functional checks:
1. Verify if a UVR is installed. It may have to be temporarily removed
to perform checks.
2. With no key, the breaker is OPEN and cannot CLOSE.
3. With the key installed and rotated 90 degrees clockwise, the
breaker is fully functional.
4. The key cannot be removed when the breaker is CLOSED.
5. The key cannot turn the breaker OFF.
6. Key removal only occurs when breaker is OFF.
Step 17: Reinstall the front cover.
Old retaining
ring
Old trip lever
Trip lever
screw (N)
Trip lever (M)
M3.2 retaining
ring (H)
5
Instructional Leaflet IL0131195EN
Effective July 2022
CES key interlock kit in IZM
low voltage circuit breakers
EATON www.eaton.com
Eaton is a registered trademark.
All other trademarks are property of their
respective owners.
CES key interlock kit in IZM
low voltage circuit breakers
Eaton Industries GmbH
Hein-Moeller-Straße 7-11,
53115 Bonn,
Germany
Eaton.com
© 2022 Eaton Industries GmbH
All Rights Reserved
Printed in Germany
Publication No. IL0131195ENH01
Effective July 2022
Instructional Leaflet IL0131195EN
Effective July 2022
Disclaimer of warranties and
limitation of liability
The information, recommendations, descriptions, and safety
notations in this document are based on Eaton Corporation’s
(“Eaton”) experience and judgment, and may not cover all
contingencies. If further information is required, an Eaton sales
office should be consulted.
Sale of the product shown in this literature is subject to the terms
and conditions outlined in appropriate Eaton selling policies or other
contractual agreement between Eaton and the purchaser.
THERE ARE NO UNDERSTANDINGS, AGREEMENTS,
WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING
WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR
MERCHANTABILITY, OTHER THAN THOSE SPECIFICALLY SET
OUT IN ANY EXISTING CONTRACT BETWEEN THE PARTIES. ANY
SUCH CONTRACT STATES THE ENTIRE OBLIGATION OF EATON.
THE CONTENTS OF THIS DOCUMENT SHALL NOT BECOME
PART OF OR MODIFY ANY CONTRACT BETWEEN THE PARTIES.
In no event will Eaton be responsible to the purchaser or user in
contract, in tort (including negligence), strict liability, or otherwise
for any special, indirect, incidental, or consequential damage or loss
whatsoever, including but not limited to damage or loss of use of
equipment, plant or power system, cost of capital, loss of power,
additional expenses in the use of existing power facilities, or claims
against the purchaser or user by its customers resulting from the
use of the information, recommendations, and descriptions
contained herein.
The information contained in this manual is subject to change
without notice.
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