3WJ Air Circuit breakers
Operating Instructions, 12/2022, L1V30828903001-01
207
Troubleshooting
Fixed-
mounted
Circuit
Withdraw-
able Circuit
Breakers
Fault Cause Remedy
The Circuit Breaker cannot be closed
mechanically and/or electrically.
(The Circuit Breaker is not ready to
close, ready-to-close indicator ❑)
mechanism has not been
spring mechanism.
The undervoltage release is
not excited.
release to the power sup-
Mechanical reclosing lock-
out active.
Rectify cause of overcur-
rent tripping and press
Electrical closing lockout
active.
Remove the control voltage
of the closing lockout. *)
Mechanical OFF pushbutton
locked.
2
1
Mechanical Circuit Breaker
interlock active (accesso-
Open the interlocking Cir-
cuit Breaker or rack it to
2
installed or installed incor-
Install the electronic trip
unit properly.
The Circuit Breaker is set to
an intermediate position in
the guide frame (note the
Rack the Circuit Breaker to
the disconnected, test, or
operating position.
Shutter for racking handle
opening not closed.
Close the shutter (to dis-
connected, test, or operat-
The Circuit Breaker cannot be closed
by electrical means.
(The Circuit Breaker is ready to
close, ready-to-close indicator OK)
the closing solenoid is in-
correct or has not been
Check that the voltage is
correct or apply the volt-
age.
The Circuit Breaker is in the
disconnected position in
Rack the Circuit Breaker to
the test or operating posi-
The auxiliary supply con-
nector has been unplugged.
Plug in the auxiliary supply
connector.
The guide rails cannot be pulled out
to install the Circuit Breaker.
The shutter is locked with
one or two padlocks.
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