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Instruction Booklet
IB 33-790-1J
Effective November 2010
Instructions for Low Voltage Power
Circuit Breakers Types DS and DSL
EaToN CorPoraTIoN www.eaton.com
The standard control utilizes AC or DC control power. For
240 or 120 volt AC equipment, the control power may be
taken direct from the source through fuses. For 480 and
600 volt operation, a suitable control power transformer is
used. The transformer is optional for 240 volt systems.
DC control voltages are 48, 125, or 250.
When the breaker closed, the “a” contact in the shunt trip
(SH-TR) coil circuit also closed to complete this trip cir-
cuit. The red indicating lamp (R) supervises the shunt trip
circuit to show that it is in working order, and indicates
that the breaker is closed.
When control power is turned on, any power-operated
breaker in the test or connected position with its springs
discharged will have its motor energized until the closing
springs are charged.
5.1.3 Manual-Operated Mechanisms
On manually operated breakers, the closing spring can
be charged only by hand, as described in Section 4.2. As
usually equipped, the breaker can be closed only by
hand, with the close bar. As an optional extra, a closing
spring release device can be supplied on these breakers.
Hand opening of the breaker can be done only by means
of the trip plate; however a shunt trip device can be sup-
plied as an optional extra.
5.1.4 Explanation of Spring-Charging Mechanism for
Manually-Operated Breakers
Figure 20 is another isometric diagram to illustrate the
mechanism in a manually operated breaker. For sake of
clarity, the actuator has been omitted.
Figure 21 gives the details of this spring-charging device
which is located between the mechanism right hand side
frame and the right crank arm. A part of this assembly is
the manual charge cam which 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 which is piv-
oted 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-wise
pin on the end. A spring forces this pin against the cam.
Another spring holds the front crank assembly in a clock-
wise direction against a stop, so that the manual
spring-charge handle socket is normally upright in the
unused position.
Fig. 21 Spring-Charging Mechanism on Manual
Operated Breakers.
The manual charge cam is mounted on the crank shaft
so that the crank pin hooks behind the hook-shaped sur-
face of the manual charge cam as shown, when the han-
dle is upright and the springs discharged. The springs
are fully charged by a 90 degree counter-clockwise rota-
tion of the handle. The crank spring then returns the
assembly to the handle-upright position. In operation this
means a single downward stroke from vertical to approxi-
mately the horizontal position. As the “Spring charged”
position is reached, the handle becomes effortless to turn
and the closing spring crank arms snap over center.
It is possible to manually recharge the closing springs
immediately after closing the breaker and before it has
been tripped open. This results in the springs loading the
associated bearings and latches for long periods. Also an
extra close operation, or trip-free operation, will be nec-
essary on levering the breaker to the disconnect and
remove positions. Therefore, it is recommended that the
springs be charged just prior to the closing of the breaker.