Question 1

Fuse blows repeatedly after replacement, how to troubleshoot?

Accepted Answer

Stop replacing the fuse directly. Repeated blowing indicates overload or short circuit in the circuit. You must find and fix the root cause before installing a new fuse.

Question 2

Can I replace a blown fuse with a higher rated current fuse?

Accepted Answer

Do NOT use a higher rated current fuse. It will fail to protect wires and equipment under overload, which may cause overheating and fire hazards. Use the fuse with the exact rated …

Question 3

What parameters should be considered when selecting a fuse?

Accepted Answer

Step 1: The fuse rated voltage shall be greater than or equal to the operating voltage of the circuit.
Step 2: Select rated current with proper margin according to the rated load c…

Question 4

Customer question: What are rated current and breaking capacity of fuse?

Accepted Answer

Rated current: nominal current value that the fuse can continuously carry without blowing. Breaking capacity: maximum short-circuit current that the fuse can safely interrupt under…

Question 5

What is the working principle of a fuse?

Accepted Answer

A fuse uses a metal fuse element connected in series within the protected circuit. When overload or short-circuit occurs, the circuit current rises sharply. The heat generated by t…

Question 6

What are the key operation points for fuse installation?

Accepted Answer

1. Confirm the rated voltage and rated current of the fuse match circuit parameters. Perform operation after power-off.
2. Check fuse holder and contacts for burning, looseness or …

Question 7

IGBT module fails to turn on, no output power

Accepted Answer

1. Gate drive power supply missing;
2. Gate wire open circuit or poor contact;
3. IGBT chip internal damage;
4. Wrong gate signal logic;
5. Interlock protection activated and locke…

Question 8

What is the storage requirement for unused IGBT modules?

Accepted Answer

Store in original anti-static packaging. Environment temperature: -10℃ ~ +40℃, relative humidity ≤70%. Avoid dust, corrosive gas and static field. Do not stack heavy goods on modul…

Question 9

How to choose the package type of IGBT module?

Accepted Answer

1. High current power converter: use full-bridge or half-bridge module package.
2. Compact cabinet: select small-size module with high power density.
3. High vibration environment:…

Question 10

What is IGBT short-circuit withstand time?

Accepted Answer

It is the maximum time that an IGBT can sustain short-circuit current under specified test conditions before device failure. Longer withstand time brings higher safety margin for p…

Question 11

Why does IGBT generate switching loss?

Accepted Answer

During turn-on and turn-off process, voltage and current overlap for a short period. Power loss generated in this overlapping interval is switching loss. It increases with higher s…

Question 12

What causes IGBT module short-circuit breakdown?

Accepted Answer

1. Overvoltage spike exceeds module rated voltage.
2. Drive circuit failure, abnormal gate signal.
3. Overload or short-circuit at output side.
4. Poor heat dissipation leading to …

Question 13

Remove and replace faulty IGBT module

Accepted Answer

Step1: Cut off all power supply, wait for capacitor discharge.
Step2: Disconnect power cables and gate drive wires of the module.
Step3: Loosen mounting screws in reverse diagonal …

Question 14

What are the common causes of IGBT module overheating?

Accepted Answer

1. nsufficient heat dissipation: uneven thermal grease, loose screws, blocked radiator.
2. Overload operation: working current exceeds module rated current.
3. Drive abnormality: i…

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Fuse blows repeatedly after replacement, how to troubleshoot?

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