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Maintenance
Adjustments, continued
Latch Engagement
During maintenance inspections, the following items should be
checked to ensure that the original settings are maintained:
Trip
(Refer to Figure 2) Toggle latch ( 1 5 ) should engage the
full width of trip latch ( 1 2) when the breaker is closed in
normal manner. To adj ust the tension on spring ( 1 3 ) can
be increased by bending the spring tab on trip flap
towards the front of the breaker. Too much tension will
interfere with the capability of the tripping actuator to
move the trip flap, so over-bending should be avoided.
Main Contact Make (See Figure 8)
Compression of the contact fingers (46) must be between
and . 1 25" (2.4-3.2mm). This is the difference between:
I
.
The measurement from the breaker base to the bottom
edge of the finger contact surface when the breaker is open, and
2.
The measurement in the same place when the breaker is
closed.
For
convenience,
a
GO/NO-GO
1 8-658-1 43-2 1 4) can be used to measure the gap between the
contact finger (46) and the extruded portion of the upper contact
assembly (37). This measurement is made with the breaker
closed. The outside contacts (46) on each pole must be checked
and adjusted, such that the GO end of the gauge can be inserted
into the gap all the way to the front surface of the contact finger's
vertical portion. The NO-GO end should not be able to be fully
inserted. Figure 6 shows the GO/NO-GO gauge and the manner
in which it is inserted between the contact fingers (46) and the
upper contact assembly (37). Figure 6a shows use of the
RL
GO/NO-GO gauge on an
circuit breaker.
Adjustment is provided by positioning screws (78) after loosening
nuts (80). Counterclockwise rotation of screws (78) increases
compression. Carefully tighten nuts (80) do not over-tighten,
damage to the pushrods may result.
If it is desired to check contact pressure, a push-type spring scale
can be used to compress contact fingers (46) with breaker open.
Contact pressure should be bet-Neen
kg) on each finger.
Figure 6. Use of the GO/NO-GO Gauge to Check Main Contact
Make (Compression)
.093"
feeler gauge
(part
no.
20
and
30
pounds
(9 . 1 -1 3.6
6 a . Check
Positi(}n I n d icator Adj ustment (
F i g u re
of Main Contact Make (Compression) using
G a uge
G O/ N O - G O
TLc
j
l' Yi i l iun l n d icator i s ad
s h a l t
t ! : c 1 · ( IN"N ECTED p o s
1 n
obb
·. } •.W l l l t>h to a l low s l iding the finer cab l e
' c r e w 1
i n ,· rc.,sc
d n : reasc the size of the loop. A d j us t t o al ign
i ii
the· l < l p . , f t h c· b
e r with the C ONNEC T E D mark o n t h
1 < _ 2 h k n t h e screw to
u : \ C I .
;< Pte t h <il 1 ; , . 2 l l l d icatcd posit ions arc not m d cpendently
<tdJ USL1hk
e xa c t a l i gn m e nt with TEST
c o
dju
e
D I . · ;( i J \i � E C T n1<1y not re
su
J L< i
i s cons idered to be more Important the
l'' ' s i t 1 u n
e<1 h k
be
c:m
a
st
d
at
that
:; i W \\
in the CONNECTED and DISCONN ECT
r:i"'
H
F i g ll
7. f ' ( l s i tion i n d icator
re
ee Figure 7)
t
S
i
(
u
s
e
d
b y rotating the racking
Then l oosen i ng t h e
i
t
on
.
l ) to
ret
ai n the cab ! �: .
lt
or
As
an example. I f the
.
position, and the error
e
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