Molded case circuit breakers cannot be pushed up, and the leakage switch does not jump out. What are the reason and solutions?
For the molded case circuit breaker, if it is overloaded or short-circuit tripped, you need to pull the handle down and then push it up to send the switch on; if this is not the reason, it may be a load, line failure, or a problem with the switch operating mechanism Wait, you can consult the electrical staff nearby.
Pay attention to safety when opening and closing the switch.
In addition, whether the leakage switch (leakage switch) is under or above the circuit breaker; if it is under the circuit breaker, whether there are multiple branch switches. If there are multiple branch switches, you can disconnect them all and try again.

What happens when the molded case circuit breaker fails to close after tripping?
1) Circuit leakage

Users who have installed a leakage circuit breaker, once a leakage occurs in the circuit, send a signal to make the circuit breaker trip automatically. In this case, it is generally impossible to close the switch. It is also very simple to judge whether the circuit breaker cannot be closed due to leakage. On the leakage circuit breaker, there will be a button, and next to the button is written "press before closing" in small characters.

This button will protrude when the circuit breaker has tripped due to leakage current. On the one hand, it is to remind you that there is a leakage in the circuit. On the other hand, it is to prevent the user from closing the switch without knowing it, causing electric shock to the circuit users. If you want to switch it on, just press this button (under normal circumstances, this button is on the same plane as the entire panel).

As mentioned above, "generally it cannot be closed", so what is unusual? In addition to the common reset button to indicate leakage, there are some brands or models of circuit breakers that use a display to indicate leakage. In place of the reset button, replace it with a display. Under normal circumstances, the display is green (or yellow), and when the leakage trips, the display turns red. This type of leakage circuit breaker can be closed directly after leakage tripping.

After the leakage trip, the molded case circuit breaker manufacturer tells you that you should pay attention to two points:
① After leakage tripping, it is allowed to close on the premise of ensuring safety;
② After the circuit breaker prompts for leakage, it proves that there is a leakage fault in the circuit, and the power should be continued after troubleshooting.

2) short circuit
Whether it is a leakage circuit breaker or an ordinary circuit breaker, when a short circuit occurs in the circuit, it cannot be closed. Short-circuit tripping, the cause of tripping cannot be directly observed from the circuit breaker. After troubleshooting the circuit breaker and confirming that it is not due to leakage tripping, it can basically be determined that there is a short-circuit fault in the circuit. Another characteristic of short-circuit faults is that common multi-level circuit breakers trip at the same time.

Short-circuit faults are more harmful, and all short-circuit fault points must be completely eliminated before attempting to close.

Reasons and solutions for molded case circuit breakers not operating or operating abnormally
1) The coil control wire of the molded case circuit breaker is disconnected. Check whether the terminal is broken or loose. If there is a broken wire, replace the wire. If the wire is loose, fasten the corresponding terminal.
2) The coil of the molded case circuit breaker is damaged. Use a multimeter to measure the resistance of the coil, if the resistance is ∞, replace the coil.
3) Molded case circuit breaker does not reset after action. If the resistance value between the two constant closing points of the multimeter block thermal relay is ∞, you can press the reset button of the thermal relay.
4) The control power supply voltage of the molded case circuit breaker is inconsistent with the coil voltage, and the rated voltage of the coil is higher than the line voltage, so it is replaced by a coil suitable for controlling the line voltage.
(5) The contact spring pressure or release spring pressure of the molded case circuit breaker is too large. Adjust spring pressure or replace spring
6) Poor contact of button contact or auxiliary contact. Clean or replace accordingly.
7) The contact stroke is too large. Adjust contact overrun.
8) The power supply voltage of the coil is too low or fluctuates too much. Adjust coil supply voltage.
(9) The capacity of the operating power supply is insufficient or the line is disconnected, the wiring is wrong, and the control contact is in poor contact. Increase power supply capacity, correct wiring, and repair control contacts.

(10) The product itself is damaged (such as broken or burned coils, stuck mechanical moving parts, rusted or bent rotating shafts, etc.) Replace the coils to eliminate stuck faults and repair damaged parts.

11) The power supply is too far away from the contactor, the connecting wire is too thin, and the thicker connecting wire should be replaced.

Summary: The molded case circuit breaker manufacturer tells you that there is a short circuit in the line, leakage, and overload tripping will cause the failure to close. How to solve the corresponding problems? It is much simpler to figure out its three states.