Effective March, 1998
IL 33-A1C-1
Page 3
Step 1: General Breaker Preparation
Before attempting to remove the Breaker from
the cell or perform any Retrofit Operation, be sure
to read and understand the Safety Precautions
section of this manual. In addition, be sure to
read and understand the
Instructions for the
Application of Digitrip RMS Retrofit Kits on Power
Circuit Breakers
(Retrofit Application Data -
Publication AD 33-855-1), supplied with the
Digitrip Retrofit Kit.
DO NOT ATTEMPT TO INSTALL OR PERFORM
MAINTENANCE ON EQUIPMENT WHILE IT IS
ENERGIZED. SEVERE PERSONAL INJURY OR
DEATH CAN RESULT FROM CONTACT WITH
ENERGIZED EQUIPMENT. VERIFY THAT NO
VOLTAGE IS PRESENT BEFORE PROCEEDING.
A. Trip the Breaker and remove it from the Cell.
Move the Breaker to a clean, well-lit work
bench.
NOTE: It is the responsibility of the Retrofitter
to insure that the Breaker and all original
components are in good condition. Visually
inspect all Breaker components for signs of
damage or wear. If any signs of damage or
wear are detected for components not included
in the Retrofit Kit, secure the necessary
replacement parts before beginning the
Retrofit Process.
The force necessary to trip the Breaker should
not exceed three (3) lbs.
To begin the Retrofit Process, refer to the
components list at the end of this manual. Lay
out the components and hardware according to
the steps outlined. The components and hardware
will be used to complete each step in the
Retrofit Process.
Step 2: Removing the Original Components
Follow the Allis Chalmers LA-1600 Blue Instruction
Manual, originally supplied with the Breaker, to
perform the following procedure.
A. Loosen the set screw and remove the
Charging Handle.
B. Remove and save the four (4) screws securing
the blue front cover to the Breaker. Remove and
save the front cover.
C. Remove and save the Finger Clusters and
mounting hardware from the Breaker Stabs on
which the Sensors are mounted.
D. Remove and scrap the original Sensors and
Sensor Spacers.
E. Remove and scrap the original Trip Unit, the
Trip Actuator, and all associated hardware
and wiring.
F. Using the original mounting hardware, reinstall
the Finger Clusters removed in Step 2c.
WARNING
