LB. 35-240-1
TYPE DB-75
DE-ION AIR CIRCUI T BREAKER
UNDERVOLTAGE TIME DELAY ATTACHMENT
The undervoltage air dashpot time delay
attachment (Figure 14) mounts on the front
of the undervoltage trip, replacing the moving
core cover.
The needle valve screw in the
top regulates the opening through which the
air is forced and hence the time delay.
The
attachment does not have a quick reset feature
and therefore approximately one minute should
be allowed between operations to permit com
plete resetting.
NEEDLE VALVE
ADJUSTMENT SCREW
,
----,
,_/
AUXILIARY SWITCH
The auxiliary switch (Figure 15) mounts on
top of the platform to the left of the oper
ating mechanism.
The contacts will carry 15
amperes continuously or 250 amperes for 3
seconds.
TABLE NO.
3
INTERRUPTING CAPACITY
INTERRUPTING CAPACITY IN AMP.
NON-INDUCTIVE
INDUCTIVE
VOLTS
CIRCUIT
CIRCUIT
125
v.
D-C
11
6.25
250
v.
D-C
2
1. 75
115
v.
A-C
75
15
450
v.
A-C
25
5
Inspection
Hold the U. V. trip lever down and close the
breaker manually.
Release the trip lever
slowly, allowing the undervoltage trip spring
to rotate the trip rod and trip the breaker
after a time delay.
CAUTION:
DO NOT USE YOUR FINGERS TO HOLD
AND RELEASE THE U.V. RESET LEVER.
Maintenance
Check for loose bolts and faulty coils.
The switch is a shaft-operated, 4-pole,
rotary type normally having two "a" contacts
(closed when the breaker is closed) and two
"b" contacts (closed when the breaker is open).
The rotor operates through a 90 degree angle
and is non-adjustable.
However, the contacts
may be changed from " a" to "b" or vice versa.
To change, remove the switch from the platform,
remove the back cover, shaft and end bushing.
Remove the rotor and change the contacts as
desired.
Be sure to replace the shaft in the
original position relative to one of the un
changed contacts.
Inspection
Remove the front cover and make sure con
t acts are touching well before the end of
travel.
25
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