Section 9: Trip unit battery
General
The battery plays no part in the protection function of the trip
system.
The battery is provided to maintain the LED indication of the
cause of trip. A Battery Check pushbutton and a green Battery
Check LED is also provided. On the initial installation of the
circuit breaker, pull to remove battery and then discard the
insulating tab and then replace battery (
Figure 22
). This will
activate the battery. Check the battery status by depressing the
Battery Test pushbutton.
Figure 22. Digitrip Battery Installation
Battery check
The battery is a long-life, lithium, camera-type unit. Check the
status of the battery at any time by pressing the Battery Check
pushbutton and observing the green LED.
If the Battery Check LED does not light green, replace the
battery. The condition of the battery has no effect on the
protection function of the trip unit. Even with the battery
removed, the unit will still trip the circuit breaker in accordance
with its settings. However, without the battery, the cause of trip
LED will not light. If the battery is replaced, one or more of the
cause of trip LEDs may be illuminated. Push the Reset/Battery
test button to turn off the indicators; the trip unit will be ready
to indicate the next cause of trip.
ote:
N
A healthy battery is required to fully reset the latch circuit holding
the associated cause of trip LEDs.
Battery Pull-Off Tab
Use Type 1/3 N
Lithium Battery
Only.
Battery Check
Reset/
Battery Test
33
EATON
www.eaton.com
Effective September 2013
Instructional Leaflet IL01301064E
Operating Manual for Series NRX
Digitrip Trip Units 1150 / 1150i
Battery installation and removal
The 3V lithium cell battery is easily removed and replaced.
The battery is located in the frame module below the Digitrip
trip unit. Insert a small screwdriver at the bottom side to open
the access door. Remove the old battery by pulling up on the
removal tab that wraps under the battery cell. When inserting
the new cell, pay special attention to ensure that the proper
polarity is observed. The main body of the battery is the
positive (+) side.
ote:
N
The battery can be replaced at any time, even while the circuit
breaker is in-service, without affecting the operation of the circuit
breaker or its protection functions.
•
CAUTION
EXERCISE CARE WHEN REPLACING THE BATTERY TO ENSURE THAT
THE CORRECT POLARITY IS OBSERVED. POLARITY MARKINGS
ARE SHOWN WHEN THE HINGED COVER IS OPEN. ACCIDENTALLY
INSTALLING THE BATTERY IN THE REVERSE DIRECTION WILL NOT
HARM THE TRIP UNIT NOR THE BATTERY, BUT WILL DEFEAT THE
FUNCTION OF THE BATTERY.
The replacement battery should be the same type as that
already in the trip unit or an equivalent.
Acceptable 3V lithium batteries of type CR 1/3N or DL 1/3N
may be used.
+
Battery
–
CR 1/3N
DL 1/3N
After replacing battery,
properly dispose.
