GE AKD-20 AR Installation And Maintenance Manual page 18

AKD-20 AR / Entellisys AR Low-voltage Switchgear
Section 3. Switchgear Description
Installing and removing of the circuit breaker from the
compartment is covered in SECTION 6 of this instruction
manual.
WARNING: The breaker compartment door must be
closed and latched to maintain the integrity of the arc
resistant enclosure. The breaker compartment door should
not be opened when the circuit breaker is closed and in the
connected position when the equipment is energized.
The racking arm (Figure 3.13) engages fixed racking anchor
pins on the sides of the circuit breaker. As the racking arms
are rotated by the operation of the racking handle (Figure
3.12), the circuit breaker is pulled into or out of the
compartment, and locked in its final position.
The circuit breaker should always be OPEN when it is moved
into or out of the CONNECTED position. As a safeguard, a
draw-out interlock will prevent access to the racking
mechanism unless the circuit breaker is OPEN.
Each circuit breaker compartment has four positions as
described in Table 3.2.
Table 3.2 Circuit breaker positions
Circuit Breaker Primary
Position Disconnects
CONNECTED Engaged
TEST Disengaged Engaged
DISCONNECTED Disengaged Disengaged Closed
WITHDRAWN Disengaged Disengaged Closed
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Courtesy of NationalSwitchgear.com
Secondary Shutter
Disconnects Assembly
Engaged Opened
Closed
Movement of the breaker between the CONNECTED, TEST,
and DISCONNECTED positions is performed by the use of a
racking handle (Figure 3.12) which engages the racking
mechanism mounted on the cassette. An optional remote
racking device is also available. Movement to the
WITHDRAWN position is manually performed after opening
the compartment door. These positions are illustrated and
described more fully in SECTION 6 of this manual.
All EntelliGuard circuit breakers are provided with a factory
installed mechanical rejection feature. See SECTION 6 of this
manual for additional details.
Depending on the equipment specified, items such as position
switch, key interlock(s) and secondary disconnects are
optional and may appear in any compartment or not be
included at all.
Although the breaker compartment door may be opened in
any position, it is recommended that the door only be opened
when the breaker is in the DISCONNECTED or WITHDRAWN
position.
Circuit Breaker
Circuit Breaker Functionality
Door
Can be operated mechanically or electrically.
Closed
Ready for serving intended load.
Can be operated mechanically or electrically.
Closed
Control circuit operations can be tested & verified.
Can be operated mechanically only.
Closed
Cannot be removed from the compartment.
Can be operated mechanically only.
Opened
Can be removed from the compartment.
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DEH-41473