CONTENTS
Introduction
Constructional Diff
erences.
.
Breaker Ratings
Drawout Breaker Interchangeability
Breaker
Maintenance
. .
Precautions
Manual Handle
Adjustment
ContactMaintenance. . . .
Contact
Adjustment:
AKR.3O,
-30H,
AKRU-30
.
AKR-50,
-50H,
AKRU-50
.
AKRT-50
Contact Replacement:
AKR-30,
-30H,
AKRU-30
.
AKR-50, -50H, AKRU-50, AKRT-50. .
. .
6
o
6
o
7
I
8
10
10
FusedBreakersAKRu-30,
-50
......
10
FuseSizesandMountinC....
10
Special
2500A
Fuse.
72
Open
Fuse
Lockout Device 12
Type SST
Overcurrent
Trip Device t4
Components 14
TripCharacteristies ......16
Troubleshooting. 77
SST
Test Set TAK-TS1.
. .
.
18
False Tripping
(Ground
Fault)
19
Replacement of
Current
Sensors 19
Flux Shift Trip Device
20
Cabling
Diagrams. 22
Ground
Fault Defeat
Cable
23
Type ECS
Overcurrent
Trip Device 24
Components
24
TripCharacteristics .,,,..25
Cabling
Diagram 26
ECS
& SST Time-Current
Curves
27
fhese inslruclions do nol
purporl
lo
cover
oll
detoils or voriations in
eguipmenl
nor to provide for
every
possrble
conlngency lo be mel in conneclion
with instollolion,
operolion
or moinlenonce.
Should further informolion
be desired or should
porliculor problems
orue whrch
ore
nol covered
sufticienlly
for
lhe purchoser's purposes,
lhe
moller should 6e referred lo lhe
Generol Eleclric Compony.