The close latch check switch
(16,
Fig.
6
and
14)
consists of a snap-action type switch mounted
in close proximity to the close latch. A striker plate at the tail of the close latch engages the
switch's actuator slightly before the fully reset position is achieved and actuates the svvitch prior
to the latches reaching the fully reset position. At the time of actuation, a contact closes
initiating the charging sequence. The switch operates with very small differential, and this
sensitivity coupled with the close latch biased engagement of the spring release rollers provides
a positive sensitive interlock.
The
mechanical interlock (Fig. 16} prevents
charging
of
the springs if the close latch is not adequately
reset.
A
linkage attached
by
a clevis to the close latch, extends down the side of the breaker frame to the
driving pawl
mechanism. An extension of
the
interlock linkage passes above the driving pawl constant
force return
s
pr
i
n
g.
If the close
latch
fails to return to a
fully reset position, the linkage extension thrusts
the driving paw
l
'
s return spring downward preventing
the driving pawl's engagement of the ratchet
w
h
e
el
,
thus mechanically inhibiting
either
manual or electrical
spring charging.
ADJUSTMENTS
Adjustable items are factory set and checked before and after numerous
mechanical operations
o
n
every
breaker
to
insure correctness. No adjustment checking should b
e necessary on new break
e
rs. If a
mal
function occurs, check for hidden shipping damage.
The following will help you make the correct adj
u
stments when replacing a broken or worn part.
CIRCUIT BREAKER TIMING
A comparison of circuit breaker timing at any period of maintenance with that taken when the
breaker was new will indicate the operational condition of the breaker mechanism. The normal
closing and tripping tolerances are given in Item
15
on Page
3.
If operation exceeds these
tolerances, a maladjustment or friction is indicated.
AUXILIARY S'NITCH
The type 0-10 auxiliary switch (Fig. 10) is designed so that the individual
c
o
n
ta
c
t
s
may be
repositioned in
fifteen degree steps without disassembling the switch.
Using long-nosed pliers, move the rotor
c
o
n
tact (16)
in
the slot of the shell (14), compressing
spring
(15).
This will free the rotor from the retainer
(17).
Rotate the rotor to the desired
position and release. Be sure the rotor springs solidly back against the retainer to fully engage
the rotor and retainer teeth.
INTERLOCK PLUN GER
The foot lever breaker release
(17, Fig. 4b)
operates the interlock plunger (18, Fig. 4b) as well
as the trip latch. Depressing the lever trips the breaker and raises the plunger. This frees the
breaker so that it can be moved in its cubic! e. The interlock system is in proper adjustment
-9-
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