5
Instruction Leaflet
IL01202013EH01
Installation Instructions For EG-DC Circuit Breaker
and Molded Case Switch
EATON CORPORATION www.eaton.com
sories, make sure that accessory wiring can be reached when
the circuit breaker is mounted.
NOTICE
LABELS WITH ACCESSORY CONNECTION SCHEMATIC DIAGRAMS ARE
PROVIDED ON THE SIDE OF THE CIRCUIT BREAKER. A NOTE SHOULD BE
MADE OF THE DIAGRAMS IF THE LABELS CANNOT BE SEEN WHEN THE
CIRCUIT BREAKER IS MOUNTED.
d. Position circuit breaker on mounting surface.
e. Install circuit breaker mounting screws and washers. Tighten
CAUTION
WHEN ALUMINUM CONDUCTORS ARE USED, THE APPLICATION OF
A SUITABLE J OINT COMPOUND IS RECOMMENDED TO REDUCE THE
POSSIBILIT Y OF TERMINAL OVERHEATING. OVERHEATING CAN CAUSE
NUISANCE TRIPPI NG AND DAMAGE TO THE CIRCUIT BREAKER .
2-7. Connect line and load conductors and accessory leads.
2-8. If required, install terminal shield on circuit breaker cover with
mounting screws provided.
2-9. After the circuit breaker is installed, check all mounting hard-
ware and terminal connecting hardware for correct torque loading.
Torque values for line/load terminals are given in Table 2 and on the
circuit breaker nameplate.
Table 2. Terminal Types
Terminal
Catalog
Number
Terminal
Material
Body
Screw
Head
Type
AWG Wire
Range
Metric
Wire
Range
Wire
Type
Torque
Value
lb-in (N.m.)
T125EF
Steel
Slotted #14-3/0 2.5-95
Cu
See
Nameplate
3. Manual Operation and Thermal-Magnetic
Adjustment
Manual Operation
Manual operation of the circuit breaker is controlled by the circuit
breaker handles and the PUSH-TO-TRIP button in the trip unit. The
circuit breaker handle has three positions, two of which are shown
on the cover with raised lettering to indicate ON and OFF. On the
sliding handle barrier, ON, OFF, and trip. They are shown by a color-
coded strip for each circuit breaker handle position: red for ON,
white for tripped, and green for OFF, ON/OFF is also shown with the
international symbols l/0
(Fig. 9
Figure 9. Circuit Breaker Manual Controls.
Circuit Breaker Reset
After an automatic or accessory initiated trip, or a manual PUSH-
TO-TRIP operation, the circuit breaker is reset by moving the circuit
breaker handle to the extreme OFF position.
NOTICE
IN THE EVENT OF A THERMAL TRIP IN A THERMAL MAGNETIC TYPE TRIP
UNIT, THE CIRCUIT BREAKER CA NNOT BE RESET UNTIL THE THERMAL
ELEMENT IN THE TRIP UNIT COOLS. NO CIRCUIT BREAKER SHOULD BE
RECLOSED UNTIL THE CAUSE OF TRIP IS K NOWN AND THE SITUATION
RECTIFIED.
PUSH-TO-TRIP Button
The PUSH-TO-TRIP button checks the circuit breaker tripping func-
tion and is used to periodically exercise the operating mechanism in
thermal-magnetic trip units. The button is designed to be operated
by a small screwdriver.
—ON
—TRIP
—OFF
(Reset)
International
Symbols
Handle Position Indicator Color - Red
White
Green
Push-to-Trip
Button
— ON
— OFF
ON
TRIP
OFF (Reset)
—
—
—
E125H-DC
68C
3719 H03
Industrial Circuit Breaker
E125H-DC Interrupting Capacity
PUSH TO TRIP
NEMA
Ratings
kA
42
50
65
Poles
In
Series
1
2
3
V
∂
125
250
500
IEC 60947-2
› kA
42
42
fi kA
42
42
Poles
In
Series
1
2
Uimp 6 kV Category A
⁄
V
∂
125
250
Non-standard Interrupting Capacity
2 Poles In Series
300 V
∂
50 kA
)
.
c. make poles in series conenctions as required for system
(refer to fig. 2-5).
