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Effective December, 1998
IL 33-DAH-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 seven (7) 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
Electromechanical Trip Units
Follow the Westinghouse DA-75 Instruction Manual,
originally supplied with the Breaker, to perform the
following procedure.
A. Remove and scrap the original
Electromechanical Trip units and all
associated hardware.
WARNING