Siemens RL Instructions

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OPERATION
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With the charging handle in its normal upright position,
the circuit breaker can be closed. By pressing firmly on
hood (50), latch (47) will disengage roller (43). Then clos-
ing springs cause cam (34) to rotate against the toggle
rollers (27), moving the toggle into its upright position, as
shown in detail (C). The closing cycle can be interrupted
at any point by operation of one of the tripping means.
This will cause rotation of trip latch (12) to a position that
releases latch (15), allowing toggle linkage to collapse to
the position shown in detail (A).
To manually open the circuit breaker, press in manual trip
rod (94). This bar engages the top of trip flap (12), to
disengage the latch (15).
B ELECTRICALLY OPERATED CIRCUIT BREAKER
The mechanism of the electrically operated circuit
breaker is the same as the manually charged circuit
breaker, except that the manual charging handle is
replaced
by a motor and gear system. Refer to Figure 1,
Table 2. Power available to the control circuit will start the
automatic charging cycle. The motor gear box pinion
rotates gear (81) counterclockwise. Cam follower (82)
engages an arm of wind and close cam (34), which rotates
the
cams in the same manner as for the manually charged
circuit breaker. When the wind and close cam (34) reaches
its
charged position, the back of the cam engages switch
lever (73), rotating the lever away from the switch opera-
tor. Gear switch lever (76) will still be holding the switch in
the operate position and the motor will continue to run
until the roll pins on the side of gear (81) lifts lever (76)
Table 2. Operating Procedure
Electrlcally Operated Circuit Breakere
Operation
Charging
Springs
Closing
"Tripping
Procedure
Energize control circuit
After springs are charged, actuate
remote close control switch (CSC).
OR
Push down firmly on spring-release
latch hood (50).
Actuate remote trip control switch
(CST) .
OR
Push in manual trip rod (94).
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clear. This releases the motor cut-off switch (MCO). When
the MCO switch opens, the motor stops, and the closing
coil circuit is set up through one side of the MCO switch.
The circuit breaker can now be closed by depressing the
latch hood (50) or by energizing the closing coil (CC)
through the external close control switch (CSC). When
the close circuit is energized, the "Y" relay is energized
and opens the "Y" contact in the coil circuit. This prevents
"pumping" or repeated attempts to close the circuit
breaker if a tripping signal or fault is present.
C. COMBINATION E.0. & M.0. CIRCUIT BREAKER
The combination manually and electrically operated cir-
cuit breaker includes both the motor-gear charging sys-
tem as well as the manual charge handle.
NOTE Manual charging handle must be in vertical
position during electrical charging.
DRAW-OUT INTERLOCK
Integral parts of the circuit breaker mechanism include
provisions to:
1. Rack the circuit breaker in or out of the cubicle
compartment.
2. Interlocking to prevent racking a closed circuit breaker
into or out of the connected position.
3. Interlocking to prevent closing a circuit breaker until it
is fully racked to the connect position.
4. Interlocking to prevent withdrawing a circuit breaker
from the cubicle while the closing springs are charged.
TRIP LATCH ENGAGEMENT
SEE FIGURE 1.
Toggle latch (15) should engage the full width of trip latch
(12) when the circuit breaker is closed in the normal
manner. The tension on spring (15) can be increased if
required by bending spring tab on trip flap towards the
front of the circuit breaker. Too much tension will interfere
with the capability of the tripping actuator to move the trip
flap, so over-bending should be avoided.
Courtesy of NationalSwitchgear.com

Siemens RL Specifications

General

Rated Voltage	250VAC, 30VDC
Mechanical Life	10, 000, 000 operations
Operating Temperature Range	-40°C to +70°C
Contact Configuration	SPDT
Contact Rating	10A
Electrical Life	100, 000 operations
Mounting Type	PCB