What are the reasons why the ME circuit breaker cannot be opened and how to deal with it?

1) The circuit breaker cannot be closed due to the loss of power of the under-voltage tripper, the voltage is too low or the under-voltage tripper coil is faulty, which will cause the circuit breaker to trip and cause the circuit breaker to be unable to be re-closed. The following four conditions can cause power loss in the undervoltage trip coil.

The fuse of the protection circuit, such as RT14, causes the circuit to be blocked, and the trip coil of the undervoltage tripper loses power;

Poor contact of the closing button, relay contact, circuit breaker auxiliary contact, etc., and damage to the components may lead to the circuit being blocked and the tripping coil losing power;

The connecting wire in the circuit is broken and the crimping screw is loose and loose, which will also cause the circuit to be blocked and the tripping coil will lose power;

Due to the long-term energized working condition of the coil of the undervoltage tripper, environmental pollution and inflexible armature attachment or large air gap between the core and the armature are easy to make the current too large and cause the tripping coil to heat up and burn out, and lose the function of the tripping coil.

The above faults can be correctly judged through observation and simple inspection and testing, so once the fault point is found, it should be eliminated in time, such as loose contacts to be tightened, components damaged and coils burned need to be replaced.

2) Mechanical system failure, resulting in the circuit breaker can not be closed.

After the circuit breaker operating mechanism has been tripped and closed many times, the mechanism is severely worn, and the following faults may occur.

If the motor transmission mechanism is worn, if the worm gear and worm of the ME switch are damaged, the operating mechanism of the circuit breaker cannot be buckled and closed again. The replacement of worm gears and worms is complex and requires professional maintenance.

The free tripping mechanism is worn, which makes it difficult for the circuit breaker to be buckled again, and the tripping is easy, sometimes it is barely buckled, and when it is vibrate, it trips by itself; Sometimes after the buckle is re-buckled, the buckle will be slid as soon as the brake is closed. At this time, the adjusting screw should be rotated to adjust the relative position of the tripping half shaft and the tripping buckle so that the contact area is left and right, and the corresponding parts should be replaced if necessary.

There are several possible causes.

1) The S trip shaft does not compress the passive axis of the clock delay mechanism, and the active shaft does not return to the amplification mechanism.

2) B, the scale of the tripper indicates that it is not on the adjustment point, and the b. Tripping shaft is over the dead center.

3) The plug-in circuit breaker is not in the right position.

4) The ejector rod cannot be lifted in the working position.

5) The excitation does not move.

6) Undervoltage does not jump off.

7) The trip rod of the clock delay amplification mechanism is behind the driving shaft.

8) The half shaft does not trip.

9) Manual can not be opened.

Exclusion method: 1) adjust the position of the clock mechanism, so that the pressure plate on the S trip shaft presses the passive shaft of the clock mechanism back to the original direction; There is a gap on the left top side, and then close the circuit breaker so that there is a delay time when the circuit breaker acts.

2) Return the B trip shaft to its original position, and then adjust it to the scale indicator point with screwing.

Reasons for the circuit breaker refusing to close:

1) The closing power supply disappears, such as the closing fuse, the control fuse is blown or the contact is poor;

2) The small switch of the closing power supply in the local control box is not closed;

3) The circuit breaker closes and locks the action, and the signal is not reset;

4) The circuit breaker operates the "remote and local" selection switch in the control box in the local position;

5) The control loop is disconnected;

6) Synchronous circuit disconnection;

7) The closing coil and closing circuit relay are burned out;

8) Operation relay failure;

9) The control handle is out of order;

10) Poor contact of control switch contact;

11) Poor contact of auxiliary contact of circuit breaker;

12) Failure of operating mechanism;

13) DC voltage is too low;

14) Poor contact of DC contactor contact.

Reasons why the circuit breaker refuses to trip:

1) The mechanical failure of the operating mechanism, such as tripping and the jamming of the iron core, etc.;

2) Relay protection failure. Such as the protection circuit relay burned out, disconnected, poor contact, etc.;

3) Electrical control loop failure, such as trip coil burned out, trip circuit disconnection, fuse blowing, etc. Zhejiang Yunkai automation equipment.

Circuit breaker with spring mechanism, hydraulic mechanism, pneumatic mechanism, electromagnetic mechanism, manual mechanism?