Effective 10/2004
Page 38
I.L. 70C1036H05
OPEN. ACCIDENTALLY INSTALLING THE BATTERY IN
THE REVERSE DIRECTION WILL NOT HARM EITHER
THE TRIP UNIT OR 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 3.0 volt
lithium batteries may be obtained from the following
companies:
Company Model
VARTA Batteries, Inc. CR 1/3N
300 Elmsford Boulevard
Elmsford, N.Y. 10523 USA
1-914-592-2500
(www.varta.com)
Duracell, Inc. DL 1/3N
Berkshire Corporate Park
Bethel, CT 06801 USA
1-800-551-2355
(www.duracell.com)
Sanyo Energy Corporation CR 1/3N
2055 Sanyo Avenue
San Ysidro, CA 92173 USA
1-619-661-6620
(www.sanyo.com)
7.0 FRAME RATINGS
(SENSOR RATINGS AND RATING PLUGS)
The frame rating of a circuit breaker is the maximum RMS
current it can continuously carry. The maximum short-
circuit current rating of the circuit breaker is usually related
to the frame rating as well.
A current value, (In), that is less than the full frame rating
may be chosen to be the basis for the coordination of the
protection function of the circuit breaker without affecting
its short-circuit current capability. For the Digitrip 1150,
this is implemented by changing the current sensors and
the corresponding rating plug. These sensors and rating
plugs are available in kit form.
The current sensor rating is the maximum current the
circuit breaker can carry with the specified current sensors
installed. The sensor rating can be the same or less than
the frame rating, but not greater.
This value, (In), is the basis for the trip unit current set-
tings:
1. The Instantaneous and Ground Current Settings (if
provided) are multiples of (In) (See Sections 4.2.1.6
and 4.2.1.7).
2. The Long Delay Current Setting, (Ir), is a fractional
multiple of (In): Long Delay Current Setting = (Ir) = LD
x (In) (See Section 4.2.1.2).
3. The Short Delay Current Setting is a multiple of (Ir):
Short Delay Current Setting = SD x (Ir) = SD x [LD x
(In)] (See Section 4.2.1.4).
CAUTION
BEFORE YOU FIT THE RATING PLUG INTO THE TRIP
UNIT, BE SURE TO CHECK THAT THE SENSOR RATING
MATCHES THAT PRINTED ON THE RATING PLUG
DOOR. INSTALLING A RATING PLUG THAT DOES NOT
MATCH THE SENSOR RATING CAN PRODUCE SERI-
OUS MISCOORDINATION AND/OR FAILURE OF THE
PROTECTION SYSTEM.
NOTE: Rating plugs from Digitrip models 210, 500, or 510
CANNOT be used with Digitrip 1150 Units.
8.0 RECORD KEEPING
Use the forms shown in Figures 8.1 and 8.2 for record
keeping. Fill in these forms, giving the indicated reference
information and initial time-current trip function settings. If
desired, make a copy of the form and attach it to the
interior of the circuit breaker cell door or another visible
location. Figure 8.3 provides a place for recording test data
and actual trip values.
Ideally, sheets of this type should be used and maintained
by those personnel in the user’s organization that have the
responsibility for protection equipment.
Courtesy of NationalSwitchgear.com
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