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Fuse Carriage
Precautions to be observed in the Operation of RLF
Circuit B reakers with RFC Fuse Carriages:
1 .
Read this I nstruction Manual before installing or
making any changes or adjustments.
2.
As the closing springs on stored-energy breakers
may be charged in either the circuit breaker open or
closed position, extreme care should be taken to
discharge all springs before working on the circuit
breaker.
3.
When charging springs of manually operated circuit
breakers, always grasp charging handle firmly until it is
returned to the normal vertical position.
Check current ratings, wiring information, circuit
4.
breaker type and static trip type against the one line
diagram to assure that circuit breakers and fuses are
located in the proper compartments within the switchgear.
Note: The separately mounted fuse carriage is equipped
with a key interlock that requires that the fuse carriage be
used in a specific compartment. Refer to nameplate on
fuse carriage for compartment number.
Check the
a
l
i
g n
m
e
n
t
o f
th
5 .
fingers to ensure against misalignment d u e to
possible distortion of fingers d uring shipment and
handling.
6.
Close the compartment door a nd secure
latches prior
to
racking to or from the C O N N ECT
position. Also close compartment door prior
closing the circuit
breaker w h e n in the
position. Once the circuit breaker is closed, keep
the door closed.
7 .
Once the
circuit breaker or fuse
e nergized, do not open the compartment doors.
Perform any required operations with external
controls, with the doors closed a nd
latched.
Installation Sequence
A WARNING
Heavy weight overhead.
Can cause death, serious personal injury or
property damage.
Always use approved lifting means to handle
cuit breakers
or
of
for use
lifting bar assembly. Avoid excessive
sudden
speeds and
er
or fuse carriage above an area where personnel
are located.
1 .
Take the key for the FUSE CARRIAGE from its
associated CIRCUIT BREAKER compartment.
'- - _________
e
secondary disconnect
the
to
C O N N ECT
carnage
is
securely
.
cir·
fuse
carriages. Follow instructions
stops. Never l1ft a circuit break
23
2.
Using the proper lifting equipment and following the
instructions (Steps A-D, on
Figure 1 on Page 5) for
circuit breaker installation, insert the FUSE CARRIAGE
into its proper compartment. Observe labeling. Unlock the
racking mechanism
using
the key from the circuit breaker
compartment. Check that the racking clevises engage the
pins on both sides of the compartment.
Use the racking crank to rotate the racking screw in a
clockwise direction until the fuse carriage reaches its
CONNECT position.
3.
Close the fuse carriage compartment door.
Operate the key interlock on the fuse carriage,
4.
which allows the key to be removed. Use the key to
operate the key interlock in the associated CIRCUIT
BREAKER cell.
5.
Using the proper lifting equipment insert the circuit
breaker into its compartment. See 'Installation'
(Steps A-D. F i g u re 1 on Page 50, and steps 5-1 0
the 'Installation (and removal) Sequence' on Page
4.
6.
During the
operation, observe that the
closing
contacts move freely without interference or rubbing
between movable
arcing
a rc chutes.
Then
refer to 'Operation',
for a detailed description of the circuit breaker
operating
cha racteristics
breaker in service.
7.
Trip units and
accessory
thorough check prior to placing the circuit breaker in
service to be certain that adjustments are correct and
parts are not
damaged. Refer to 'Static Trip Ill
Information and
Guide', SG-3 1 1 8.
I nstruction
8.
Drawout circuit breakers are equipped with a
drawout interlock to prevent movement of a closed circuit
breaker into or out of the CONNECT position. See
Page
9
'Drawout Interlock',
interlock. Its operation should be checked before the
circuit breaker is energized. The fuse carriages are
interlocked with a key and lock system to assure that the
circuit breaker is OPEN (see 'Key Interlock System',
Page
23) before the fuse carriage can be racked in or
out.
9.
Upon completion of the installation inspection, the
circuit breaker is ready to be energ ized after the control
wiring, if any, is checked and the insulation tested. (Also
see 'Testing Open Fuse Trip Attachment',
1 0.
Before
racking
the
circuit
CONNECT
CONNECT position, check that the open fuse trip
attachment is reset properly. If the attachment is correctly
reset, close the compartment door, and rack the circuit
breaker into the
position. Remove the racking
crank and close the racking window. The circuit breaker
can now be operated in
its
normal manner.
1 1 . To remove the Circuit Breaker/Fuse Carriage, reverse
the above
procedures.
of
contacts and parts of the
Pages
6-1 0
before putting the circuit
devices should receive a
for a description of the
Page
23).
breaker
into
the
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