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I N S TA L L AT I O N , O P ER AT I O N S A N D M A I N T EN A N C E M A N UA L
Circuit breaker operation
General
Included below are abbreviated operating
instructions for Emax 2 circuit breakers. Before
activation of the circuit breakers or operation of
the switchgear equipment, thoroughly read and be
familiar with the circuit breaker manuals which will
be supplied as supplementary information to this
manual. Publication number is
.
Manually operated circuit breakers
Closing operation
Manually operated Emax 2 circuit breakers are
equipped with an integral charging handle and a
push button marked "I" on the front of the cover.
The spring must be charged first.
• A complete charge is accomplished by pulling the
handle down about 90° (until it stops) ten times
to fully charge the closing springs. This will not
close the breaker contacts. The charge indicator
will show CHARGED on a yellow background.
Opening Operation
A mechanically operated open button marked "O" is
mounted on the breaker front cover, operates the
trip shaft to open the breaker.
Electrically operated circuit breakers
closing operation
Electrically operated breakers may be closed by
ac control power, or dc (normally station or standby
battery) control power. Refer to the provided
elementary diagrams for information on
control circuitry.
Operating the switchgear
Opening operation
A shunt trip device is used for electrical tripping
and each breaker can have up to two shunt trip
accessories installed.
Circuit breaker draw-out operation
Breaker positions
Refer to Figs. 87, 88, and 89. The draw-out
operation features four positions:
1. Connected - In the CONNECTED position, the
primary and secondary disconnects are fully
engaged. The breaker must be opened before
it can be racked out of this position.
2. Test - When in the TEST position, the primary
contacts are disconnected, but the secondary
contacts remain engaged. This allows complete
breaker operation without energizing the
primary circuit.
3. Disconnected - In the DISCONNECTED position,
neither primary nor secondary contacts are
made. Breakers may be racked between these
three positions with the compartment door
closed and latched.
4. Withdrawn - With the door open, the
breaker can be rolled out manually from the
DISCONNECTED to the WITHDRAWN position.
Here, the breaker is completely out of its
compartment, ready for removal.
