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 TABLE 3-1 ... (continued)
TROUBLESHOOTING CHART FOR CIRCUIT BREAKER OPERATION
Trouble
Probable Cause
Course of Action
o Blown fuse in control Replace blown fuse.
circuit.
o Loose or broken wire Repair faulty wiring.
in trip circuit.
See that all binding
screws are torqued to
manufacturer's or U.L.
specifications.
o Dirty contacts on
Clean dirty contacts.
tripping device
(Control switch,
protective relays,
or auxiliary switch).
o Failure of control
Investigate.
power.
Failure to close. o Blown fuse in control Replace blown fuse.
circuit.
o Loose or broken wire Repair faulty wiring.
in trip circuit.
See that all connections
torqued to
manufacturer's or U.L.
specifications.
o Dirty contacts on
Clean dirty contacts.
tripping device
(Control switch or
auxiliary switch).
Failure to close. o Failure of control
Investigate.
power.
o Insufficient air
Investigate.
pressure.
Unnecessary
o Setting of relays or
Set relay or device for
tripping (that
calibration setting
proper value according
is tripping when of direct tripping
to ampere load of
tripping should device too low.
circuit.
not occur).
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