Quantcast Figure 3.10. Racking of a circuit breaker cont'd

 

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Figure 3.10. Racking of a circuit breaker
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TM-5-6120-250-12 Substation Trailer Mounted 500 KVA AC 4160-416Y/240V 208Y/120V 3 Phase 50/60 Hertz Manual
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Figure 3-11. Stored-energy manual closing mechanism
hole (21 in the guide rod (3). This prevents the closing
WARNING
springs (4) from releasing their energy to close the
When circuit breakers are being inspected, operated
breaker contacts.  Complete the last clock- wise or
slowly or maintenance work is being done the breaker
fourth stroke.
Following the inspection period or
must be in the open position as the closing springs are
maintenance, the closing springs must be recharged
being restrained by the safety pin. The procedure for in-
with the closing handle. Complete 31/2 complete cycles
serting and removal of the safety pin is given below in
as before and before the fourth counterclockwise stroke
remove the safety pin from the guide rod and place in
the retaining spring clip adjacent to the guide rod.
c.  To restrain closing springs operate the
Complete the last clock- wise stroke and the breaker will
charging (closing) handle (5, fig. 3-11) 31h complete
close. The breaker must be tripped to open before it
cycles. At the end of the fourth counterclockwise stroke
can be pushed into its compartment.
and before performing the fourth clockwise stroke insert
the safety pin (1) into
3-18

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