Siemens RL Instruction Manual page 8

Fuse Carriage
Introduction
Type RFC-3200 and RFC-4000 fuse carriages for use with
Type RLF-3200 and RLF-4000 circuit breakers are furnished
for mounting in metal-enclosed switchgear of the drawout
type. (See Figures 10 and
pletely assembled, tested, and calibrated at the factory in a
vertical position, and must be so installed to operate properly.
Description
The basic RL -3200 unfused circuit breaker has a maximum
continuous current rating of 3200 amperes, and an interrup­
tion rating of 65,000 amps symmetrical at 254,508 or 635 VAC
when used without an instantaneous trip. It has an interruption
rating of 85,000 amperes symmetrical at 254,508 or 635 VAC
when used with instantaneous trip.
The basic RL-4000 unfused circuit breaker has a continuous
current rating of 4000 amperes, and an interruption rating of
85,000 amperes symmetrical at 254,508 and 635 volts when
used without instantaneous trip. The interruption rating is
130,000 amperes at 254 volts, and 85,000 amperes sym­
metrical at 508 and 635 volts, when used with instantaneous
trip.
When used in conjunction with the separately mounted fuse
carriage, the circuit breaker designation becomes RLF-3200
and RLF-4000. The fused breakers have an attachment that
operates to open the circuit breaker when one or more of the
current limiting fuses opens. The interruption rating of the
combination of fuses and circuit breaker is increased to the
interrupting rating of the fuses-200,000 amperes symmetri-
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Figure 10. Fuse Carriage with Compartmen: Door Closed
11.) All fuse carriages are com­
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cal at 600 volts or less. The continuous current rating may be
restricted by the fuse size used. When equipped with 6000
amperes fuses, the RLF-4000 combination is rated at 4000
amperes continuous. The RLF-3200 combination is rated at
3200 amperes continuous when equipped with 5000 ampere
fuses. The circuit breaker continuous ratings are reduced
when smaller rated fuses are used. (Refer to the catalog for
application information.)
The fuse carriages are provided with open-fuse sensors
connected to the open-fuse trip attachment which is mounted
on the circuit breaker. This device opens the circuit breaker
when one or more of the current-limiting fuses open.
Note: Tripping depends on voltage being developed across
the open fuse by the power source. NO TRIPPING WILL
OCCUR IF THE POWER CIRCUIT IS DE-ENERGIZED.
Precautions to be Obs erved in the Operation of RLF
Circuit Breakers with RFC Fuse Carriages:
1. Read this Instruction Book before installing or mc."rny any
changes or adjustments.
2. As the closing springs on stored-energy breakers may be
charged in either the circuit breaker open or closed posi­
tion, extreme care should be taken to discharge all
springs before working on the circuit breaker.
3. When charging springs of manually operated circuit
bre?kers, always grasp charging handle firmly until it is
returned to the normal vertical position.
F ig Fuse Carriage witr. Compartment Door Open
ur 11.
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