Check the secondary circuit:
1. Power voltage of motor shouldn't less than 85%Ue.
2. Check the storage mechanism, replace it if necessary.
The breaker
can't be
closed
Breaker hasn't stored energy
Fault description
Maintenance method
1. Check the breaking current value and operation time of intelligent release.
2. Analyze the load and electric network, exclude the overload if it happens.
3. Match the actual operating current with long time-delay current setting value.
4. Press the reset button to reclose the breaker
1. Check the breaking current value and operation time of intelligent release.
2. Exclude the short circuit fault if it happens
3. Check the setting value of intelligent release
4. Check the normal state of breaker
5. Press the reset button to reclose the breaker
1. Check the breaking current value and acting time of intelligent release.
2. Exclude the earthing fault if that happens.
3. Match the fault current setting value with the actual protection.
4. Press the reset button to reclose the breaker.
1.Check the power is on or not
2.Check the power voltage of under-voltage release, it shouldn't be less
than 85%Ue.
3.Replace the control unit of under-voltage release
Check the working state of two circuit breakers fixed with mechanical interlock
Reasons analysis
Short circuit tripping
(“Isd”or“Ii”indicator flashing)
18. Regular malfunction and solutions
Press the reset button to reclose the breaker
Make the breaker to "making" position
("click" sound will be heard)
Intelligent release don't reset
(panel is raised)
Secondary circuit of drawerout-
type breaker isn't connected
Check the working state of two circuit breakers
fixed with mechanical interlock
1. Power voltage of closing electromagnet
shouldn't less than 85%Us.
2. Replace the electromagnet.
The breaker
can't be
closed
Mechanical interlock acting
leads to locking of breaker
Closing electromagnet:
1.Rated control voltage is
less than 85%Us;
2.Closing electromagnet
is damaged
The breaker can't be opened manually
1. There is fault with mechanical
operating mechanism
1. Check the mechanism, if there is fault happened.
The breaker can't be opened by
motor remotely
1. There is fault with mechanical
operating mechanism
2. Power voltage of shunt
release is less than 70%Us;
3. Shunt release is damaged
1. Check the mechanism, if there is fault happened.
2. Check the Power voltage of shunt release is less
than 70%Us or not
3. Replace shunt release
Circuit breaker
can't be opened
Tripping immediately:
1. Short circuit current is closed
2.Delay tripping because of
transient current is high
when closing;
3. Overload current is closed
1. Check the breaking current value and operation time of intelligent release;
2. Exclude the short circuit fault if it happens;
3. Exclude overload fault
4. Check the normal state of breaker
5. Modify the current setting value of intelligent release
6. Press the reset button to reclose the breaker
Tripping after
closing the
circuit breaker
(Fault indicator
flashing)
Over load tripping
(Ir indicator flashing)
Tripping of
circuit breaker
Earthing fault tripping
(IG indicator flashing)
Under-voltage release fault:
1. Rated working voltage is
less than 70%Ue
2. Fault of control unit
Mechanical interlock acting
Fault description
Maintenance method
Reasons analysis
Manual storage can't be realized
Mechanical fault with the energy-storage device
Circuit breaker
can't store energy
Motor storage can't be realized
1. Power voltage of motor
energy-stored device is less than 85%Us;
2. There is mechanical fault
with energy-storage device
1. Power voltage of motor energy-stored device shouldn't less
than 85%Us
2. Mechanical fault with the energy-storage device
1. Take away the padlock
2. Pull the slideway or breaker body into its position
Drawerout-type
breaker can't be drawn
out at the "opening"
position
1. Handle isn't pulled out
2. Breaker is not totally at the
“opening" position
1. Pull out the handle
2. Keep the circuit breaker totally at “opening” position
Drawerout-type breaker
can't reach the
"making" position
1. Something drop into the drawer base,
and lock the mechanism or mechanism
fault happens.
2. Breaker body not match with the frame
-size rated current of drawer base
1. Check and clean the drawer base, or contact with manufacturer
2. Match the body with relevant drawer base
No display on
intelligent release
panel
1. Release isn't connected
with power
2. There is fault with release
1. Check the power is connected or not
2. Cut off the power, then connect again. Otherwise contact
with manufacturer
Rated control voltage is less than 85%Us; Check the electromagnet power voltage shouldn't be less than 85%Us.
Fault happened with
intelligent release
Cut off the power, then connect again. Otherwise contact
with manufacturer
Handle of drawerout-
type circuit breaker
can't be drawn in or out
1. There is padlock at the "opening" position
2. Slideway or breaker body
isn't pulled into its position
Fault indicator still
flashing after pressing
the Reset button
C
NA1
Air Circuit Breaker
P-102
P-101
NA1
Air Circuit Breaker
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