8
IZM63 / IN63 low voltage air circuit breaker
MN013014EN May 2021 www.eaton.com.cn
Section 2: Receiving, handling, and installation
Compartment
Front Door
Secondary
Connection Made
Rear of
Compartment
Primary
Connections
Made
• Full Breaker Operation
• Primary, Secondary, and Ground Connections Made
• Fully Racked into Cassette (compartment)
Circuit
Breaker
Side View
Figure 2-7 CONNECT position
Figure 2-8 Cassette label showing disconnected, test,
and connected position of recessed cover
CAUTION
Make certain that the circuit breaker is fully inserted into its
compartment before any attempt is made to lever the circuit
breaker. Attempting to lever the circuit breaker in before it is
fully positioned inside its compartment can result in damage
to both the circuit breaker and the compartment.
2-7.2 Levering circuit breaker
The circuit breaker is now ready to be levered. With the
circuit breaker OPEN, the levering device access door can
be raised. The levering device is hand operated using a
standard 3/8-inch square drive and ratchet, which is not
provided (Figure 2-9). As long as the levering access door
is raised, the circuit breaker is held trip-free. Begin by
rotating the levering-in screw to the full counterclockwise
(DISCONNECT) position.
Close the compartment door and begin levering the break-
er into its different positions using a clockwise ratcheting
motion. The circuit breaker can be levered with the compart-
ment door open or closed, but it is advisable to close the
door prior to levering.
The position of the circuit breaker within its compartment is
indicated by color-coded position indicators (red = Connect,
yellow = Test, green = Disconnect) (Figure 2-12). When
the circuit breaker is levered fully to the DISCONNECT or
CONNECT position, the levering shaft hits a hard stop; do
not exceed 34.2 Nm of torque or the levering mechanism
may be damaged. To remove the circuit breaker from its
compartment, follow the procedure just described using a
counterclockwise ratcheting motion.
NOTICE
The circuit breaker mechanism is interlocked such that
charged closing springs are automatically discharged if the
circuit breaker is levered into or out of the cell. Discharge
takes place between the DISCONNECT and the TEST
position.
