Siemens RL Series, Instructions Manual

Page: 15 / 76

Description
The continuous current and interrupting ratings of the circuit breakers are
as shown on the circuit breaker rating label.
The circuit breakers are also available with integrally mounted current
limiting fuses through
2000A frame size, and with separately mounted
fuses for
3200A, 4000A
and
SOOOA
frame size. For
800A, 1600A
and
2000A frame sizes the basic circuit breakers are the same with or without
fuses. The fuses mount on a bracket that is bolted to the side plates and
upper studs on the back of the circuit breaker. Due to this difference,
fused circuit breakers are
not
interchangeable with unfused circuit
breakers. The current limiting fuses increase the interruption rating to
that of the fuses. Fused circuit breakers arc identified as R LF
-
800
,
RLF-
1600, RLF-2000, RLF-3200, RLF-4000 or RLF-5000. Fused circuit
breakers are equipped with an open fuse trip device to open the circuit
breaker if one or more current limiting fuses open.
Note: Fused circuit breakers. Are not physically
interchangeable with unfused breakers.
Unfused circuit breakers can also be supplied for stationary mounting in
which the racking components are omitted and brackets are provided for
mounting to a stationary frame
All RL circuit breakers usc the same hasic closing mechanism or
Operator. The closing springs
u
s ed
van
between sizes. Two
configurations of the operator a r e available
fc1r
charging the closing
springs, manually charged or el
e
c t ri
ca
l
ly
charged. For electrical
operators, a maintenance handle accessory can be used to charge the
springs manually for maintenance or in an emergency. Optionally, a
built-in manual spring charging handle
can
be provided.
The manual and electrical operators arc
identical
except for the means of
supplying energy to the closing
sprmg'
A d,mblc-toggle, trip-free
mechanism is used. This means that the breaker contacts arc free to open
at any time if required, regardless
of the p(1sit1on
of the mechanism
Precautions to be observed in
Operation
1.
Read this Instruction Manual
before
installing or making any
changes or adjustments
on
the circuit breaker.
2.
Stored-energy closing springs may be charged when the
circuit breaker contacts are either open or closed.
EXTREME CARE SHOULD BE TAKEN TO
DISCHARGE THE SPRINGS BEFORE WORKING
ON THE CIRCUIT BREAKER.
3.
When closing a breaker out of the compartment, the racking
mechanism must be returned to the TEST position before
the closing springs can
be charged.
4. When charging manually operated breakers, always hold the
handle fim1ly until it
is
returned to the normal vertical
posttwn. A ratchet
insures
that the spring charging
operation must be completed once started.
5.
Check current ratings, circuit breaker wiring information, circuit
breaker type and trip device type, against the One-Line Diagram
to
assure that circuit breakers
arc located
i
n the proper compartments
within the Switchgear.
I
1 :
:;
�,\jE:' I) 11
6
6.
Check
the
alignment of the Secondary Disconnect fingers. This
ensures against misalignment due to possible distortion
of
fingers
during shipment and handling
7.
Close the compartment door and secure door latch or latches prior to
racking the circuit breaker to or from the CONNECTED position.
Also close and latch the door prior to closing the circuit breaker
when in the CONNECTED position. Once the circuit breaker is
closed, keep the door closed.
8.
ONCE THE CIRCUIT BREAKER OR FUSE CARRIAGE IS
ENERGIZED, DO NOT OPEN
TIIE
COMPARTMENT
DOORS. PERFORM ANY REQUIRED OPERATIONS
WITH EXTERNAL CONTROLS, WITH THE DOORS
CbOSED AND SECURELY LATCHED.
-
ADANGER
Hazardous voltages and high-speed moving
parts.
Will cause death, serious personat injury, and
property damage.
Always de-energize and ground
the
equipment
before maintenance.
Read instruction manuals. observe safety instruc­
tions, and limit use to quaf,f•ed personnel.
Manually Operated Circuit Breakers
The breaker has a center-mounted frame, so many of
the
latches and links
are arranged in pairs. For descriptive purposes, they will be referred to as
single items. Refer to Figure
2 and Table
I.
Detail
"A" shows the
position of the trip latch
and
toggle linkage when the circuit hreaker is
open and the dosing springs are discharged.
Table
I.
Operating Procedure for Manually Operated Circuit
Breakers
Operation Procedure
Charging Spri
n
gs Pull charging handle down all the way
(approximately 120') and return it to normal
vertical position. (Engagement of pawl with
I
ratchet teeth prevents handle reversal until
the downward stroke is completed.)
Closing
Push
down
fi
r
ml
y on spring-release latch
hood (50) after handle is returned to
normal vertical
Tripping
Push in manual trip
rod (94)
OR
If
shunt
trip is provided,
o
p
e
ra
te externa
l
Control switch (CS!T}
to
trip or open
Breaker.
(See
Figure 3.)
Movement of the charging handle downward rotates closing
ratchet ( 140) lifting roller ( 43), thus pivoting closing cam (34)
clockwise about pin (40). This extends the closing springs
through lillk (41) and spring hanger (58). Rotation of cam (34)
allows roller
(27) in toggle linkage to be moved into position
shown in Detail B. Kickoff spring (10) moves rollers (27) away
from the stop block
(7).
Then, the toggle linkage is moved by a
torsion spring until latch ( 15) clears trip flap (12). Spring (13)
causes trip flap (12) to reset under latch (15). Trip flap (12)
should normally stop against the front surface of latch (15).
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