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Instructional Book IB694C694-03
Section 4: Basic Operating Instructions
WARNING
WHEN CHARGING A CIRCUIT BREAkER ON ITS COMPARTMENT
EXTENSION RAILS OR ON A WORkBENCH, HOLD IT TO PREVENT
IT FROM TILTING FORWARD AND POSSIBLY TOPPLING TO THE
FLOOR CAUSING EQUIPMENT DAMAGE AND/OR SERIOUS BODILY
INJURY.
4-1 Manual Circuit Breaker Operation
On manually operated circuit breakers, the closing springs
can only be charged by hand. The circuit breaker cannot be in
the REMOVE position when manually charging the springs.
The design is such that the springs will not be permitted to
fully charge, before discharging (trip-free close operation). If
a circuit breaker has been removed from its compartment to
a remote location for maintenance and charging of the clos-
ing springs is required, the levering device arms on the sides
of the breaker must be rotated away from the REMOVE
position to the TEST position (Figure 2-4). This is accom-
plished through the use of the levering crank as described in
paragraph 2-5.
When the circuit breaker is in the CONNECT or TEST posi-
tion as indicated on the front control panel indicator, the
closing springs can be charged by a single stroke downward
on the spring charging handle to a position nearly 90 degrees
from its normal upright rest position (Figure 4-1). When the
springs are charged, the handle will suddenly become very
easy to move, and a metallic "click" will be heard as the over
center closing springs stop is reached. The spring charge
indicator on the front control panel will also indicate "Spring
Charged. "
CAUTION
DO NOT RELEASE THE CHARGING HANDLE BEFORE THE
CHARGING OPERATION IS COMPLETED. IF THE HANDLE
IS RELEASED BEFORE THE OPERATION IS COMPLETED,
THE HANDLE wILL RETURN TO ITS NORMAL POSI-
TION wITH A VELOCITY GREAT ENOUGH TO BREAK THE
CHARGING HANDLE KNOB OR CAUSE BODILY INJURY.
Standard manually operated circuit breakers can only be
closed by hand using the close bar (Figure 3-3). An optional
closing spring release device can be supplied for this same
purpose. Refer to paragraph 3-10.2 for additional information.
Standard manually operated circuit breakers can be opened
manually by using the trip plate on the front control panel or
the trip plate on the compartment door. Automatic opening
of the circuit breaker can be accomplished through the use
of several standard and/or optional devices. Refer to para-
graph 3-8.1 for details.
4-1.1 Spring Charge Mechanism for Manually Operated
Breakers
The mechanism in a manually operated circuit breaker is
graphically illustrated in Figure 4-2. The actuator is omitted
for the sake of clarity.
Figure 4-3 shows details of the spring-charging device. It is
located between the mechanism right hand side frame and
the right crank arm. A part of this assembly is the manual
charge cam. It is rigidly fixed to the crank shaft, the same as
the main close cam and crank arms.
The other parts are the front crank assembly. It is pivoted to
a bracket fastened to the main frame base, and has a socket
for the manual charge handle. The rear crank is pivoted to
the front portion, and has a cross-
Figure 4-1 Manual Charging of Breaker Closing Springs
eaton corporation www.eaton.com
Effective July 2010
29
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