Table Of Contents - GE AKR-3-50 Maintenance Manual

CONTENTS
GENERAL DESCRIPTION.
.
General
Breaker
Types
Mounting
Fused Breakers.
Breaker Ratings
Breaker
Description . . . .
.
RECEIVING, HANDLING, AND
STORAGE
Receiving and
HandlinC
. .
.
Storage
BREAKER OPERATION
Putting the Breaker in Service
Drawout
Breakers
Breaker Insertion
(Fig.
3)
Breaker Withdrawal
Stationary
Breakers
Pre-service
Check
Operating the Breaker
Manual Closing
Electrical
Closing
Openlng
the Breaker
Interlocks
Closing Spring
Interlock (Figs.
6A and
68).
.
Racking Mechanism
Interlocks (F'ig.
8)
Optional
Interlocks
Accessories
. .
.
Shunt
Trip
Undervoltage Device
Static
Time-delay Undervoltage . .
.
Electric
Lockout Device
Auxiliary
Switch
BeII
Alarm
BREAKER MAINTENANCE.
Safety Precautions
General
Arranging the Breaker
for
Slow Closing
Lubrication
Replacement
and
Adjustment of Components
and
Accessories .
.
.
Mechanism
(Figs. 12,
13, and
14)
. . . .
.
Mechanism Replaeement
(Figs.
15 and 16)
.
.
Latch Adjustment
Manual Handle Adjustment
Contact Maintenance
Contact Replacement
(Fig.
17)
Contact Adjustment
Components
and
Accessories
.
Auxiliary
Switch
(Fig.
18)
Shunt
Trip
and
Undervoltage
Device (Figs.
19 and
20).
.
.
Maintenance of Static Delay Device
for
Undervoltage
(Figs.
21 and
22)
.
.
Electrical Control
C
omponents
Bell Alarm/Lockout
FiS.
26).
Drawout Mechanism
and
Interlocks . .
.
AKRU-50 Fused
Breaker
Fuse Replacement
Open
Fuse Lockout
Device (Fig.
32)
Power Sensor Overcument
Trip
Device
False Tripping
Caused
by
Faulty
Ground
Fault Operation
.
Testing Current
Sensors
Replacement
Magnetic
Trip Device (Figs.
33 and
38)
.
.
Page
3
3
3
4
4
4
4
5
5
5
5
t
5
5
n
I
7
8
8
8
10
10
10
10
11
11
12
t2
13
13
13
l4
t4
15
15
15
15
16
16
16
18
19
19
19
19
20
2l
2t
22
24
25
27
28
29
29
31
31
34
34
34
36
Selective
Tripping
36
Time-current
Curves
3?138