Features and Characteristics
Basis Configurations
All Power Break®
II
circuit breakers are available in two levels
of interrupting capacity - "standard break" and "Hi-Break®"
breakers. Each interrupting level is available in both station
ary and drawout construction, w ith a full complement of
control and signaling accessories.
Standard break breakers are designed to meet the majority
of application requirements, calling for moderate levels of
available short-circuit current.
Hi-Break breakers, on the other hand, are specially designed
to withstand the stresses, and safely interrupt high levels of
short circuit current found in some applications (from 65 to
200 kA rms symmetrical amps - depending on voltage).
Manual Operation
The circuit breaker closing spring is energ ized by size opera
tions of the retractable pump handle. Each handle move
ment is a stage in the pre-charging of a spring-loaded,
quick-make, quick-break mechanism. To close the breaker
contacts, depress the "PUSH ON" button. With the breaker
in the "ON" position, it is now possible to recharg e the main
closing springs by repeating the spring charging procedu re.
The circuit breaker opening springs are a utomatically
charged when the breaker is closed. To open the breaker
and de-energize downstream circuits, manually depress the
"PUSH OFF" button.
Electrical Operation
The electrical operation fits under the cover of the manually
operated breaker. This assembly may be added to a ny Power
Break
II
breaker - in the factory or in the field - to provide
the electrical charge feature. All breaker controls inputs and
outputs are pre-wired to dedicated secondary terminals for
Table
5.1
Sequence Of Operation
ON/OFF
Main Breaker
Charging Spring
Indicator
Contacts
Indicator
OFF
Open
Discharged
OFF
Open
Charged
ON
Closed
Discharged
ON
Closed
Charged
OFF
Open
Charged
Operation of circuit breaker pump handle
easy field installation. To complete the remote-operation
feature, a remote-close solenoid and either a shunt trip (with
or w ithout lockout) or undervoltage release accessory is a lso
required. The electrical operator can be wired to a utomati
cally re-charge the breaker after CLOSE or upon command.
Should motor control power be lost during the charg ing cycle
13
seconds duration), spring charging may be com pleted
manually by using the pump handle. No special tools are
required. Any electrically operated breaker may be operated
manually.
For details of electrica l control power requirements and wir
ing diagrams, see pages 25-26.
Breaker Closing Speed
Three-cycle maximum closing speed, at nominal voltage, is
standard for all frame sizes. This speed exceeds the require
ments for generator synchronizing.
Condition of
Next Permissible
Charging Spring
Operating Function
Discharged
Closing springs may be charged
Fully Charged
Contacts may be closed
Discharged
Contacts may be opened, or
closing springs may be charged
Fully Charged
Contacts may be opened
Fully Charged
Closing spring may be discharged
without closing contacts by depressing
OFF button while pushing ON button
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