Effective 11/2003
Page 8
I.L. 66A7535H02
Figure 1.3 Installation of the Rating Plug and Mounting
Screw
CAUTION
DO NOT FORCE THE RATING PLUG INTO THE CAVITY.
Use a 1/8" (3 mm) wide screwdriver to tighten the M4
screw and secure the plug and the trip unit to the circuit
breaker
(See Figure 1.3)
. Close the rating plug door.
CAUTION
THE M4 SCREW SHOULD BE TIGHTENED ONLY UNTIL
IT IS SNUG. DO NOT USE A LARGE SCREWDRIVER. A
1/8" (3 mm) WIDE SCREWDRIVER BLADE IS AD-
EQUATE.
1.3.3 Trip Unit/Rating Plug Removal
To remove the rating plug from the trip unit, open the rating
plug door. Use a 1/8" (3 mm) wide screwdriver to loosen
the M4 screw. Pull the door to aid in releasing the rating
plug from the unit.
1.4 Installing the CH Type-V Current Sensors
The internal components of the circuit breaker, and how
they are wired out to the breaker secondary contacts are
shown in Figures 1.4, 1.5, 1.6 and 2.3. Also refer to the
master connection diagram provided in Appendix C.
1.4.1 Installation Procedure
The CH Type-V Current Sensors/Rating Plug Kit supplied
with this breaker must be installed and wired by the user.
The installation steps are as follows:
a. PRIMARY - Mount one CH Type-V current sensor on a
customer supplied, insulated bushing behind the circuit
breaker. The bushing must be rated for the system Light-
ning Impulse Withstand Voltage (LIWV), and the ground
(earth) shield terminal or ground (earth) shield surface
must be connected to the ground (earth) bus. Confirm that
the polarity mark (red dot) on the front of the current
sensor faces the circuit breaker.
b. SECONDARY - Connect secondary terminals of the
current sensor to the correct terminals in the switchgear
control circuit using #14 AWG Type SIS wire. Terminal X1
is the one nearest to the polarity mark. Refer to Appendix
C for distinction between Fixed and Drawout variations.
Consult manufacturer if length of wire to device exceeds 12
feet (3.7m).
c. Use ring terminals on current sensor terminals. Use
AMP #66598-2 female sockets to connect to breaker’s
secondary connector.
d. Ground (Earth) the non polarity terminal of each sensor.
Also Ground the bushing shield surfaces.
e. Install rating plug into Digitrip 1150V trip unit for the
matching CH Type-V current sensors. Also attach the
additional rating plug label to the circuit breaker enclosure
as a future reference indicating which CH Type-V current
sensors are used in this application.
1.4.2 CH Type-V Current Sensor Functionality
The three CH Type-V current sensors are installed external
to the circuit breaker over the main circuit conductors by
means of bushings equipped with a ground shield. The
current sensor rating defines the breaker rating (
I
n)... i.e.
1200A:1A sensors are used on a 1200A rated breaker.
To remove the trip unit from the circuit breaker, deflect the
top and bottom spring clips to release the unit from the
black mounting platform. Pull the unit to disengage the trip
unit’s printed circuit board connectors J0 & I1 from the
circuit breaker
(See Figure 1.2 and Appendix C).
