e.
With the screwdrivers in position, gently rock the
trip unit from side to side until it works free from the
circuit breaker.
3.4 Trip Unit Replacement
Make sure the trip unit to be installed is suitable for the
intended installation by comparing the trip unit catalog
number with the nameplate on the circuit breaker frame
located to the right of the handle. Rejection pins are used
in the circuit breaker frame to prevent the installation of
an incorrect trip unit.
a.
Remove any existing trip unit by following the
procedures in paragraphs 3.3.a through e.
Note: The replacement trip unit should be installed
before the circuit breaker cover is re-installed.
b.
Position the replacement trip unit above the white
terminal block to the left of the circuit breaker han-
dle. Align the protruding circuit board with the mat-
ing slot in the white terminal block (see Fig. 3.7).
c.
Carefully press the trip unit into place. A sharp click
will be heard as the retaining springs click into posi-
tion.
d.
Install rating plug (see paragraphs 3.2.b through e).
e.
Reinstall the circuit brea
k
er c over.
Torque cover
4.0 DIGITRIP RMS MODEL CONSIDERATIONS
4.1 Digitrip RMS 310
The Digitrip RMS 310 Trip Assembly consists of a Digitrip
RMS 310 Trip Unit as described in I.L. 29C883, 3 or 4
auxiliary current transformers and a stab-in trip unit ter-
minal block as shown in Figs. 4 and 5.
The fourth auxiliary current transformer is supplied when
the optional ground fault or neutral protection function is
selected in the trip unit. Also, a side mounted 4-point ter-
minal block is provided to pre-wire the mode of ground
fault sensing used, i.e., residual or source ground. These
connections are shown in Fig. 16.
Fig. 3.7. Installation of Trip Unit
IN A DRAWOUT MOUNTED BREAKER TESTING OF A
CIRCUIT BREAKER BY INI
TI
ATING A TRIP OPERATION
WHILE IN THE CELL " CONNECTED" POSITION BY
THE EXTERNAL TEST KIT OR THE INTEGRAL TEST
PROVISIONS IN THE DIGITRIP RMS TRIP UNIT IS
NOT RECOMMENDED.
THE TRIPPING OPERATION OF THE CIRCUIT
BREAKER WILL CAUSE DISRUPTION OF SERVICE
AND POSSIBLY PERSONAL INJURY RESULTING
FROM UNNECESSARY SWITCHING OF CON-
NECTED EQUIPMENT.
TESTING OF A CIRCUIT BREAKER SHOULD BE
DONE ONLY IN THE " TEST" , " DISCONNECTED" OR
“ WITHDRAWN" CELL POSITIONS.
WHERE A CIRCUIT BREAKER TRIP OPERATION IS
DESIRED FOR A FIXED MOUNTED CIRCUIT
BREAKER, TESTING SHOULD BE CONDUCTED
ONLY WHEN THE EQUIPMENT IN WHICH THE
BREAKER IS MOUNTED IS COMPLETELY DE-ENER-
GIZED
.
CAUTION
EATON CORPORATION www.eaton.com
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screws to 24 in-lbs.
