Analysis of 7 Major Causes of Circuit Breaker Damage

Circuit breakers are the primary devices that ensure circuit safety, but their damage will lead to power loss, electrical burns, and even fire risks. In this article,

we discuss the 7 most common causes of circuit breaker damage so you can detect the root cause of the problem and take measures accordingly.

1.Circuit overload: hidden dangers of overloaded operation

Overload is the most common cause of damage to circuit breakers.

When the total power consumed by electrical equipment in the same time period in the circuit is higher than the rated power of the circuit breaker, the current passing over the rated level for a period of time can cause contact burnout or insulation aging.

For example, if a 16A circuit breaker is overloaded for a long time under a current of 17A, it will trip or be damaged

Solution: Reasonably allocate electricity load, avoid connecting too many high-power devices to a single circuit, and prevent circuit breaker overload.

 

2.Short circuit fault: instantaneous current surge

On an occurrence of a short circuit, the neutral wire and live wire touch physically, and the current immediately shoots to infinity, something that may short circuit the circuit breaker contacts or coils immediately.

Short circuits primarily occur as a result of aging of the circuit, insulation, and wiring defects and are indicated by burning smell or soiling of the socket

How to identify a short circuit: If the circuit breaker still trips even after unplugging all the plugs, then it may be a short circuit fault

Circuit breaker on the combustion wiring board

3.Voltage instability: dual threats of undervoltage and overvoltage

When there is voltage instability that is abnormal, the circuit breaker’s protection mechanism will be activated, and voltage instability is referred to as undervoltage and overvoltage. Below are elaborate explanations and solutions
Undervoltage: When voltage is lower than the normal voltage, the undervoltage release is able to repeatedly trip, causing wear to mechanical components.
Overvoltage: Too much voltage can make coils or electronic equipment burn, typically due to lightning or electrical grid fluctuations.
Solution: Install a voltage regulator or overvoltage/undervoltage protector, especially where the voltage is unstable.

 

4.Mechanical failure: Wear and tear of the opening mechanism and contacts

Wear and tear or improper installation of mechanical components may cause circuit breakers to fail to close or open properly. For example:

Opening mechanism jamming: coil burnout caused by iron core displacement or improper lubrication

Contact oxidation: Arc erosion produces poor contact between the contacts, increasing resistance and warming

Maintenance suggestion: Clean contacts regularly and check flexibility of circuit breaker mechanism

Aging of circuit breaker

 

5.Coil burnout: the impact of overcurrent and pollution

The opening coil or release coil is damaged due to overload current, line impurity (e.g., dust deposition), or aging. This type of fault is common in frequent tripping or in damp environments.
Prevention method: Regularly clean the inside of the circuit breaker to avoid poor heat dissipation caused by dust covering.

 

6.Equipment aging and quality issues

End of life: If the service life of a circuit breaker is too long (usually 10-15 years), internal springs, plastic parts, etc. may fail due to fatigue.
Poor quality products: Cheap circuit breakers use low quality materials and melt instead of tripping in case of an overload.
Purchase Guide: Adopt a well-known brand and replace ageing equipment in time. Suggest ONESTO, a well-known brand of circuit breakers with high quality, low price, and complete after-sales service

 

7.Summarize

What causes circuit breakers to break? By understanding the above 7 reasons, you can effectively prevent circuit breaker damage and ensure the electrical safety of your home and business.

  • Author William

    I am William, a professional with 12 years of experience in the electrical industry. We focus on providing customized high-quality electrical solutions to meet the needs of our customers. My professional fields cover industrial automation, residential wiring, and commercial electrical systems. If you have any questions, please contact me:
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