rectly installed, the circuit breaker cannot be reset or
placed in the ON position.
Before the rating plug can be installed, the trans-
parent trip unit cover must be removed from the cir-
cuit breaker.
To install the rating plug on Digitrip RMS Models 510,
interlock button to point towards the REMOVE posi-
tion.
a.
Remove transparent trip unit cover after loosening
the four thumbscrews.
b.
Make sure arrow on rating plug interlock button is
pointing at REMOVE. Adjust, if necessary, using a
c.
Position the rating plug over the trip unit as shown
in Fig. 3.5. The pin on the rating plug shaft must
line up with the matching slot in the trip unit.
d.
Push the rating plug in as far as it will go. The
electrical contact pins will enter matching holes in
the trip unit. A springiness will be felt when the rat-
ing plug bottoms in the trip unit.
lock button. Press in approximately 1/16-inch and
turn button 90
°
clockwise to the “ENGAGED” posi-
tion.
Note: If unit is a Digitrip RMS 310, and an adjustable
rating plug is installed, set rating plug switch marked
A, B, C, D to the current rating desired.
f.
After adjusting trip unit settings to the desired set-
tings, close the rating plug
'
s hinged cover and re-
install trip unit transparent cover. Secure in position
with four thumbscrews.
g.
Circuit breaker can now be reset and switched to
the ON and OFF positions.
3.3 Trip Unit Removal
Use the following instructions to remove a Digitrip trip unit
from a circuit breaker.
THE VOLTAGES IN ENERGIZED EQUIPMENT CAN
CAUSE DEATH OR SEVERE PERSONAL INJURY.
BEFORE REMOVING THE COVER OF AN R-FRAME
CIRCUIT BREAKER MOUNTED IN AN ELECTRICAL
SYSTEM, MAKE SURE THERE IS NO VOLTAGE AT
LINE OR LOAD TERMINALS. SPECIAL ATTENTION
SHOULD BE PAID TO REVERSE FEED APPLICA-
TIONS TO ENSURE NO VOLTAGE IS PRESENT.
a.
Press the Push-to-Trip button in the circuit breaker
cover to trip the circuit breaker.
b.
Remove eight cover screws and circuit breaker
cover.
c.
Remove the rating plug. Flip the hinged cover
open. Turn the interlock button counter clockwise to
the REMOVE position. Rating plug will raise
slightly. Grasp rating plug and pull out gently. Make
sure pin in shaft lines up with slot in trip unit. Adjust
position of interlock button as required to ensure a
smooth withdrawal of the shaft.
screwdrivers, lift up on the spring clips located at
each end of the trip unit (see Fig. 3.5).
WARNING
WARNING
EATON CORPORATION www.eaton.com
Page 5
BEFORE YOU FIT THE RATING PLUG INTO THE
TRIP UNIT, BE SURE TO CHECK THAT THE
BREAKER TYPE AND FRAME RATING (OR
SENSOR RATING IF APPLICABLE), MATCH
THOSE PRINTED ON THE RATING PLUG COVER.
INSTALLING A RATING PLUG THAT DOES NOT
MATCH THE BRAKER TYPE AND FRAME
RATING (OR SENSORRATING, IF APPLICABLE),
CAN PRODUCE SERIOUS MISCOORDINATION
AND/OR FAILURE OF THE PROTECTION
SYSTEM.
