19
A K D - 20 A N D E NTE LLYS I S
LO W VO LTAG E S W I TC H G E A R
The cassette racking arm slots engage fixed
racking anchor pins on the sides of the breaker.
As the racking arms are rotated by operation of
the racking handle, the breaker is pulled into
the compartment, and locked in its final
connected position.
The 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
breaker is OPEN.
All EntelliGuard circuit breakers are provided with a
mechanical rejection feature. See section 5 of this
instruction book for additional details.
Each circuit breaker compartment has four
positions as described in the Table 3.1.
Note: Items shown in Figs. 3.9, 3.12, and 3.13
(such as secondary disconnects and shutters)
are optional and may appear in any compartment
or not be included at all, depending on the
equipment specified.
Movement of the breaker between the
CONNECTED, TEST, and DISCONNECTED positions
is performed by the use of a racking handle, see
Fig 3.11, 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WITHDRAWN position is manually performed after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 5
of this instruction book.
Caution: The door should NOT be opened
when the circuit breaker is closed and in the
CONNECTED position. 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DISCONNECTED or WITHDRAWN position.
Prudence: Vous ne devez PAS ouvrir la
porte lorsque le disjoncteur est fermé
et en position CONNECTED (connectée).
Bien que vous puissiez ouvrir la porte du
compartiment d'un disjoncteur dans
n'importe quelle position, nous vous
recommandons de l'ouvrir uniquement
lorsque le disjoncteur est en position
DISCONNECTED (déconnectée) ou
WITHDRAWN (retirée).
Circuit breaker
position in
the cassette
Primary
disconnects
Secondary
disconnects
Shutter
assembly
Circuit breaker functionality
Circuit breaker
door position
Connected
Engaged
Engaged
Opened
• Breaker can be operated mechanically or
electrically.
• Breaker ready for service.
Closed
Test
Disengaged
Engaged
Closed
• Breaker can be operated mechanically or
electrically.
• Breaker and control circuits operations can
be tested and verified.
Closed
Disconnected
Disengaged
Disengaged
Closed
• Breaker can be operated only mechanically.
• Breaker cannot be removed from the circuit
breaker compartment.
Closed
Withdrawn
Disengaged
Disengaged
Closed
• Breaker can be operated
only mechanically.
• Breaker can be removed from
the compartment.
Open
Table 3.1 - Description of the circuit breaker positions
1
2
1
1. Racking handle
2. Breaker position indicator
1. Primary disconnect
—
Fig. 3.10
EntelliGuard circuit
breaker (rear view)
—
Fig. 3.11
Racking handle
for movement
of EntelliGuard
circuit breakers
—
Fig. 3.11
—
Fig. 3.10