GE AKR-30S Manual page 40

Circuit breakers are
designed primarily to per­
form the function of circuit
interruption under short­
circuit conditions. Neverthe­
less, modern circuit breaker
mechanisms are capable of
many operations under full­
load operation and in-rush
conditions such as encoun­
tered in motor starting appli-
Ta!Jie 55 . '
Circuit Breaker
Frame Size
(Amperes)
225
800
1 600
2000
3200
4000
(A)
Servicing consists of
adjusting, cleaning, l ubricat-
ing, tightening, etc., as rec-
om mended by the manu-
facturer. When current is
interrupted, dressing of con-
tacts may be required as
well. The operations listed
are on the basis of servicing
at intervals of six months or
less.
(B) When closing and open-
ing no-load .
(C) With rated control volt-
age applied.
(D)
Frequency of operation
not to exceed 20 in ten min-
utes or 30 in an hour. Rectifi-
cations. Industry standards
have been established tor
the m inimum performance
which is indicated in the
table below. With adequate
maintenance, G E breakers
can be expected to exceed
the standards.
Power operated circuit
breakers, when operating
Related Continuous
Number of
Operations
Between
(A) (C) (D) ( E )
Servicing
(F)
2500
1 750
500
500
250
250
ers or other auxiliary devices
may further limit the fre-
quency of operation.
(E)
Servicing at no greater
intervals than shown in
second column above.
(F) No functional parts
should have been replaced
during the listed operations.
(G)
The circuit breaker
should be in a condition to
carry its rated continuous
current at rated maximum
voltage and perform at least
one opening operation at
rated short-circuit current.
After completion of this
series of operations, func-
under usual service condi­
tions, shall be capable of
operating the number of
times specified in the follow­
ing table. The operating
conditions and the permissi­
ble effect of such operations
upon the breaker are given
in the following lettered para­
graphs. For each col umn,
all paragraphs listed in the
Number of Number of
Operations Operations
Current Closing and
Switching Opening
(A) (B) (C) (D)
(H) (J) (E) (F)
(G) and
4000
2800
800
800
400
400
tional part replacement and
general servicing may be
necessary.
(H)
When closing and open-
ing current up to the contin-
uous current rating of the
circuit breaker at voltages up
to the rated maximum volt-
age and at 85% of the power
factor or higher.
{I) When closing currents
up to 600% and opening
currents up to 100% (80%
power factor or higher) of the
continuous current rating of
the circuit breaker at volt-
ages up to the rated maxi-
mum voltage.
When closing currents
column heading must
be given consideration .
This standard applies to all
parts of a circuit breaker that
function during normal oper­
ation. It does not apply to
other parts, such as over­
current tripping devices, that
function only during infre­
quent abnormal circuit
conditions.
Number of
Operations
No-Load In-Rush
Current
Switching
(C) (D) ( E )
and (G)
(G) (I) and
1 0000
9700
3200
3200
1 1 00
1 1 00
up to 600% and opening
currents up to 600% (50%
power factor or less) of the
continuous current rating of
the circuit breaker at volt-
ages up to rated maximum
voltage, the number of oper-
ations shown shall be re-
duced to 1 0% of the number
listed.
(J)
If a fault operation occurs
before the completion of the
l isted operations, servicing
is recommended and possi-
ble functional part replace-
ments may be necessary,
depending on previous
accumulated duty, fault
magnitude, and expected
future operations.
(F)
(J)
2000
1400
400
400
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