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Breaker Disassembly , Assembly and Adjustment
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TM-5-6120-250-34 Substation Trailer Mounted 500 KVA AC 4160-416Y/240V 208Y/120V 3 Phase 50/60 Hertz Avionics Model 950-2200A Manual
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Figure 5-4. AK-3-50 Circuit breaker
higher current pickup. provided the fault is on the part of
the mechanism trip latch by moving against trip paddles
the line protected by the breaker having the lower setting.
fastened on the tip shaft. Looking at the breaker from the
Hence if a fault occurs  in any part of the electrical
right, counterclockwise rotation of the trip shaft causes the
system, only the breaker nearest the fault will trip.  In
breaker to trip. Clockwise rotation resets the mechanism
order to reduce the possibility of damaging the equipment
latch. The manual trip button and overload devices all
and to provide maximum safety to the operator, the
operate in this fashion to trip the breaker. The movement
overload caused d by a fault is removed in a minimum
of the striker arms of each of these, when activated,
amount of time by selective tripping.
should move from 1/32 to 1/ 16 inch beyond the point at
producing current  up to five or ten times the breaker
which tripping occurs. This is what is meant by "positive
rating are removed in a matter of a few cycles less while
tripping."
currents  in  excess  of  this  value  are  removed
instantaneously For the exact characteristics and setting
c.  Selective Tripping. Selective tripping is obtained
each in a selective  system m see coordination charts
when the breakers in the electric al distribution system are
figure 5-5 and 5-6 When malfunctioning of the power
arranged on the basis of a progressive series of time and
sensor trip is indicated the trouble should be traced to
current pickup.  This will allow the breaker having the
one or more of the four components involve and that
shorter time setting and the lower pickup to trip before the
component should be replaced as a unit.
breaker having the longer time setting and the
5-9

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