FAQ
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Q1【MCCB】Why can’t a phase contact be closed?
Replace the tripping rod. Adjust it to the value as specified in the original technical conditions.
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Q2【MCCB】Why can’t the shunt trip trip the circuit breaker?
Replace the coil. Change the power supply voltage. Re-adjust and tighten it.
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Q3【MCCB】Why can’t the manually-operated reset circuit breaker be closed?
Check the circuit, apply voltage or replace the coil. Replace the spring. Re-adjust the force of the spring and reset the trip latch to the specified value.
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Q4【MCCB】Why can’t the electrically-operated circuit breaker be tripped?
Change the power supply voltage. Increase the operating power capacity. Replace the pull rod. Replace damaged components.
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Q5【MCCB】Why can’t an undervoltage release trip the circuit breaker?
Adjust the spring. Adjust or replace the spring. Check the cause of getting stuck, such as a rusty spring.
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Q6【MCCB】Why does the circuit breaker trip immediately when the motor starts?
Adjust the instantaneous setting value. Check the valve and the rubber grommet in an ACB and replace them if abnormal. Replace the circuit breaker if the inrush current, which is greater than the rated current, leads to the tripping.
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Q7【MCCB】Why does the earth-leakage circuit breaker often trip by itself?
Send it to the manufacturer for re-adjustment. Replace the circuit breaker if the wire insulation is damaged.
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Q8【MCCB】Why does the circuit breaker trip by itself after closing for a period of time?
Re-adjust it. Replace it.
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Q9【Contactor】Why does the contact not operate or operate abnormally?
1.Adjust the power supply voltage.2. Increase the power supply capacity, correct the wiring, and repair the surface of the control contact.3. Replace the coil.4. Replace the coil to preventcontact sticking.5. Adjust the contact parameters as required.6. Replace with athicker connecting wire.
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Q10【Contactor】Why does the contactor not release or release slowly?
1. Repair or replace the contact.2. Prevent contact sticking by repairing the damaged parts.3. Replace the reaction spring.4. Clean the pole face of the iron core.5. Replace the iron core.
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Q11【Contactor】Why does the contactor electromagnet (AC) make a loud noise?
1. Increase the voltage in the operating circuit.2. Adjust the spring pressure of the contact.3. Replace the coil.4. Clean the pole surface of the iron core.5. Reverse the iron core.6. Replace the iron core.
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Q12【Contactor】What is the cause for contact welding?
1. Repair or replace the contact.2. Prevent contact sticking by repairing the damaged parts.3. Replace the reaction spring.4. Clean the pole surface of the iron core.5. Replace the iron core.
