Effective 8/13/99
Page 25I.L. 70C1037H02
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 SERIOUS MISCOORDINATION AND/OR
FAILURE OF THE PROTECTION SYSTEM.
NOTE: Rating plugs from Digitrip models 210, 500, or
510 CANNOT be used with DT20 Trip 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 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.
9.0 REFERENCES
9.1 Magnum and Magnum DS Circuit Breakers
I.B. 2C12060 Magnum DS Breaker Instructions
I.B. 2C13060 Magnum I. Breaker Instructions
4A36346 Zone Interlocking Application with Non-
Magnum Breakers
9.2 Time-Current Curves
The Time-Current Curves are listed below for particular
trip unit models. All protection function time-current
settings should be made following the recommendations
of the specifying engineer in charge of the installation.
70C1009 Digitrip 220 (LI) Curve
70C1006 Digitrip 520 (LS) Curve
70C1007 Digitrip 520 (I) Curve
70C1008 Digitrip 520 (G) Curve
Courtesy of NationalSwitchgear.com
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