I.B. 33-215-1
OIL CIRCUIT BREAKER
ADJUSTMENT
Connect the coverplate to the breaker units.
Adjust the length of the rod so that with the cover
plate in the latched position the toggle on the
breaker unit is within approximately
inch of its
stop. On remote control breakers the length of rods
should be adjusted so each bell crank travels an
equal distance each side of centerline, i.e., with
coverplate and breaker unit in mid position each
bell crank should be approximately right angles to
pipe. Be sure to lock adjustments with pipe nuts
when adjustments are completed.
Check to see that, with handle in open position
there is some clearance left between trip lever and
top of slot in the coverplate and that the breaker
unit linkage is resting on the open position stop.
Check to see that with coverplate in the closed
position contacts are properly engaged.
The length of the lift rods in the Type F-11 breaker
is fixed. The cross bar clamps to the upper end, the
moving contacts clamp to the lower end. An indent
in each end presses into the wood and prevents
rotation. In replacing rods squeeze the indent into
the wood by clamping in a vise or with a "C"
clamp. Tightening the bolts alone does not provide
the necessary pressure.
The lift rods in the Type F-22 breakers are
threaded on both ends. The proper adjustment is
secured when the contacts are at the proper closed
position with the toggle stop in the linkage in con
tact. A wood screw prevents rotation. In replacing
rods be sure there are no burrs in the threaded
holes and drill a hole in the wood rod to start the
locking screw.·
Check operation when the breaker is closed
suddenly and when trigger is released with breaker
in the closed position. Check to see that moving
contacts enter approximately centrally between the
fingers when closing and that the arcing contacts
engage first and break last.
Check to see that trigger releases trip lever if it
is raised slowly to full travel. Use only graphite
type lubricant such as used for locks or guns on the
trigger roller.
Raise trip core of each trip device and check to
see that trigger is released with approximately
inch of travel left. Check to see that with trip rod in
contact with trigger applying minimum rated cur-
STUD
CLAMP NU
INSULATOR
CONTACT
SPRINGS
SHUNT
FINGER
ARCING
CONTACT
MAIN
CONTACT
T
@ @
0
0
TYPE F-22 CONTACTS
FIG.
5. Contacts
F-22
rent to the trip coil or 80% of normal voltage to a
shunt trip coil will release trigger.
Check undervoltage to see that applying 80% of
normal voltage picks up the armature from the re
trieved position. Check to see that armature will
drop from closed position when voltage falls to
about 50% of normal, check to see that releasing
the armature slowly by hand still releases trigger
without stalling.
Light out each contact of auxiliary switch in bell
alarm.
7
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