GE Industrial Solutions Entellisys Installation - Manual (Page 21)

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Entellisys Low Voltage Switchgear
Chapter 3. Description
1. Racking arm
2. Drawout interlock
Fig. 3-8. EGX-08 circuit breaker
EntelliGuard breakers do not contain current transformers.
Instead, current transformers are mounted over the primary
disconnect stabs of all Entellisys breaker compartments.
Primary disconnects are equipped with short-circuit braces
when breakers are fused or when extra-deep breaker
compartments are used.
The breaker racking arm slots engage fixed racking anchor
pins (6), Fig. 3-6, mounted in the breaker compartment. As
the racking arms are rotated by operation of the breaker
racking crank, the breaker is pulled into the compartment,
and locked in its final connected position.
A breaker should always be OPEN when it is moved into or
out of the CONNECTED position. As a safeguard, the
drawout interlock (2), Fig. 3-8, will cause the breaker to open
before the primary disconnects lose contact if a closed
breaker is moved out of the CONNECTED position.
EntelliGuard circuit breakers having higher continuous or
interrupting current ratings may be substituted for those
having lesser ratings. The compartment, however, retains the
factory-configured ratings and protection settings.
Substitution of manual for electric or electric for manual
EntelliGuard breakers is not recommended.
1. Racking arm
2. Secondary disconnects
3. Racking screw
Fig. 3-9. EGS-40 circuit breaker
Each breaker compartment has four positions as described
below:
1. CONNECTED POSITION-The breaker is in operating
position, both primary and secondary contacts made,
and the door closed.
2.
TEST POSITION-The secondary contacts are made, but
the primary contacts are not made. Any breaker test
that requires control power may be made in this
position.
3.
DISCONNECTED POSITION-All primary power and
secondary control electrical circuits between the breaker
and the equipment are disconnected. The door may be
closed. The breaker may be stored in this position with
the door closed.
4.
WITHDRAWN POSITION-The breaker is completely
out of its compartment ready for removal from the
equipment. The door must be open. The optional
primary disconnect shutters, positioned in front of the
primary stabs, would be closed with the breaker in the
WITHDRAWN position.
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