AIR CIRCUIT BREAKERS
www.
sigmaelektrik
.com
19
ACB
SOME TROUBLES AND SOLUTIONS
The breaker can't be
closed
Intelligent release don't reset (panel is raised)
Press the reset button to reclose the breaker
Secondary circuit of drawerouttype breaker isn't
connected
Make the breaker to "making" position ("click" sound will
be heard)
Breaker hasn't stored energy
Check the secondary circuit:
1. Power voltage of motor shouldn't less than 85%Ue.
2. Check the storage mechanism, replace it if necessary.
Closing electromagnet:
1.Rated control voltage is less than 85%Us;
2.Closing electromagnet is damaged
1. Power voltage of closing electromagnet shouldn't
less than 85%Us.
2. Replace the electromagnet.
Tripping after closing the
circuit breaker (Fault indi-
cator flashing)
Closing electromagnet:
1.Rated control voltage is less than 85%Us;
2.Closing electromagnet is damaged
1. Power voltage of closing electromagnet shouldn't
less than 85%Us.
2. Replace the electromagnet.
Circuit breaker can't be
pened
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
can't be opened
1. Check the mechanism, if there is fault happened.
Circuit breaker
can't store energy
The breaker can't be opened by motor re-
motely
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 store
energy
Manual storage can't be realized
Mechanical fault with the energy-storage device
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
Handle of drawerouttype
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
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
Closing electromagnet:
1. Rated control voltage is less than 85%Us;
2. Electromagnet is damaged
1. Check the electromagnet power voltage shouldn't
be less than 85%Us.
2. Replace the closing electromagnet.
Fault indicator still flashing
after pressing the clear
button
Fault happened with intelligent release
Cut off the power, then connect again. Otherwise
contact with manufacturer
Fault description
Reasons analysis
Maintenance method