Siemens RL Series, Instructions Manual

Page: 47 / 76

Fuse
Introduction
Type RFC-3200 through RFC-5000 fuse carriages for use
with Type RLF-3200 through RLF-5000 circuit breakers are
furnished for mounting in metal-enclosed switchgear of the
Drawout type. (See Fig ures
1 2
and 1 3). All fuse carriages are
completely assembled, tested, and calibrated at the factory in
a vertical position, and must be so installed to operate
properly.
Description
The basic RL-3200, RL-4000 and RL-5000 unfused circuit
breakers have continuous current ratings equal to their frame
size (3200A, 4000A or 5000A) or tripping transformer rating
(whichever is lower), and interrupting ratings as shown in the
·
descriptive bulletin.
When used in conjunction with the separately mounted type
RFC fuse carriage, the circuit breaker designations become
RLF-3200, RLF-4000 and RLF-5000. 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 symmetrical 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-5000 combination is rated at 5000 amperes continuous.
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 type RFC fuse carriages are p rovided 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 C I RCUIT IS DE-ENERGIZED.
Figure
1 2.Fuse Carriage Compartment with
Door
Closed
Figure 1 3.
Fuse Carriage in Compartment with
Door
Open
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