28
Instruction Leaflet
I. L. 29-889B
Effective June 2011
Instructions for Digitrip RMS 910 Trip Unit
eaton corporation
www.eaton.com
6.5 Series C
®
R-Frame Molded Case Circuit Breakers
29C106
Frame Book
29C107
Frame Instruction Leaflet
29C713
Supplementary Instructions for Series C
®
R-Frame used with the Digitrip RMS Trip Units
AD 29-167R
Typical Time-Current Characteristic Curves for
R-Frame Circuit Breakers
SC-5626
Instantaneous (I)
SC-5627
Long Delay and Short Delay (LS)
SC-5628
Ground (G)
I .L . 29C714
Master Connection Diagram for Series C
®
R-Frame Circuit Breakers
6.6 Assemblies Electronic Monitors
I .L . 17-382
AEM - II
6.7 INCOM
®
AND IMPACC
®
COMMUNICATIONS
I .L . 17-384
IMPACC
®
System Communications
I .L . 17-199
lnstructions for Computer Operated Network
Interface Card used in INCOM
®
Networks
T .D . 17-531
IMPACC
®
Wiring Specifications
appenDiX a: Zone lnterlocking
Assume a ground fault of 2000 Amperes occurs and refer to Figure
A .1 .
CASE 1e: There is no Zone Selective Interlocking (standard time
delay coordination is used).
Fault 3
The branch breaker will trip clearing the fault in 0 .1 s .
Fault 2
The feeder breaker will trip clearing the fault in 0 .3 s .
Fault 1
The breaker will trip clearing the fault in 0 .5 s .
CASE 2e: There is Zone Selective lnterlocking.
Fault 3
The branch breaker trip unit will initiate the trip in 0 .03 s to clear the
fault and Z3 will send an interlocking signal to the Z2 trip unit; and Z2
will send an interlocking signal to Z1 .
Z1 and Z2 trip units will begin to time out, and in the event that the
branch breaker Z3 would not clear the fault, the feeder breaker Z2
will clear the fault in 0 .3 s (as above) . Similarly, in the event that the
feeder breaker Z2 would not clear the fault, the main breaker Z1 will
clear the fault in 0 .5 s (as above) .
Fault 2
The feeder breaker trip unit will initiate the trip in 0 .03 s to clear
the fault; and Z2 will send an interlocking signal to the Z1 trip unit .
Z1 trip unit will begin to time out, and in the event that the feeder
breaker Z2 would not clear the fault, the main breaker Z1 will clear
the fault in 0 .5 s (as above) .
Fault 1
There are no interlocking signals . The main breaker trip unit will initi-
ate the trip in 0 .03 s .
Figure A .2 presents a Zone Selective lnterlocking connection dia-
gram for a system with two main breakers from incoming sources
and a bus tie breaker . Note the blocking diode Dl is needed so that
the feeder breakers can send interlocking signals to both the main
and tie breakers, without having the tie breaker send itself an inter-
locking signal .
