SP RING ADJUSTER
ARMATURE
TRIP
LEVER
PIN
L_J
FIG.
17A. Automatic Retrieve Undervoltage Trip
The viscosity of the oil affects the time delay.
The temperature of the oil affects its viscosity. The
time delay also varies inversely with the size of the
overload. Hence, this device cannot be used to ob
tain a definite time delay. Overloads persisting for
a short time such as occur when starting a motor
will not trip the breaker. If the overload persists
tripping will take place.
The hand retrieve undervoltage release is mount
ed on the left hand coverplate mounting bolt. It is
necessary to remove the bolt and insert it from the
rear screwing it into the tapped hole in the under
voltage cover. Check to see that with the handle
rotated in a clockwise direction as far as it will go
the application of 80% control voltage will hold
armature. Check to see that, with handle released
HINGE JAW
FIG.
18. Auxiliary Switch
MOUNT I N G
SCREW
BLADE
slowly after removal of voltage, the trigger of cover
plate is released. Check to see that armature will
drop and trip breaker when voltage is reduced to
approximately 50% of normal. Adjustment is pro
vided to vary pull of spring to vary drop out voltage.
This device must be used when coil is con
nected to load side of the breaker.
The automatic retrieve undervoltage release is
mounted on the right hand coverplate bolt. Check
to see that when the breaker is open and the reset
pin is clear of the reset lever that the reset spring
brings the armature up so that 80% of normal
voltage will hold armature. Check to see that when
breaker is closed the reset pin forces the reset
lever clear so armature can drop and release the
FIG.
19. Bell Alarm Switch
15
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