Westinghouse Type
F-122
Oil Circuit-Breakers
ttagnet
Cti·cuit
Tripping Spring
Coil
Armature
FIG.12-HAND RETRIEVE UNDER VOLTAGE RELEASE
Tripping Spring
Re5et
Lever
FIG. 13-AUTOMATIC RETRIEVE UNDERVOLTAGE RELEASE
that the tripping functions will be
properly performed. A little oil on the
bearings at intervals will keep the parts
in
good operating condition.
Other
Devices-Though there
is
nothing about the construction of the
other auxiliaries and tripping devices
which would require the attention of the
operator periodically, yet it is recom
mended that the tripping devices be
given a casual inspection to see that
cotter pins have not become lost and
that screws and bolts are tight. Moving
parts should be operated by hand to see
that they are free on their bearings and
do not bind.
Description and Adjustments
of Auxiliaries
Rod
Stationary Core
Tube
locK Nut
The handle trigger holds the handle
lever down after the circuit-breaker has
been closed by pushing the handle. The
auxiliaries will operate to disengage the
trigger from the tap lever. Raising the
handle disengages the handle trigger and
permits the breaker unit to open.
The coverplate is made in three
arrang=ents, the two-coil single-handle
coverplate
is
used on non-automatic or
automatic single-throw breakers unless
special requirements demand the three
coil single-handle coverplate.
The double-handle coverplate is used
with all automatic and non-automatic
motor starting combination of breakers.
A special assembly of this double
handle coverplate can be used with
motor starting combinations.
It is
provided with a pin to operate the
automatic retrieve undervoltage release
and latches are removed from starting
side so that it is impossible to leave the
motor running on starting voltage.
Undervoltage
Release-The hand re
trieve undervoltage release must be
connected so as to leave the coil de
energized when the circuit-breaker is
open. This may be done by energizing
from the load side of breaker or wiring
through the signal switch. Upon the
reduction of the voltage across the coil
to approximately
50
per cent of the
normal voltage, the armature will be
TubQ
Corg
Oasn Pot Clam�
Piston
Nut
Dash
Pot
Coverplate-
The coverplate contains
the operating handle with space for
overload coil, auxiliary switch, bell
alarm, undervoltage and other auxil
iaries. The operating handle is in two
parts. The trip lever is attached to the
breaker unit through a rod at the rear of
the
panel and engages the trigger in the
handle lever on the front of the panel.
Frc. 14-0VERLOAD RELEASE CoRES
12
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