As a seasoned supplier of moulded case circuit breakers, I often encounter inquiries regarding the proper storage of these crucial electrical components. Moulded case circuit breakers play a pivotal role in electrical systems, protecting circuits from overcurrent, short - circuit, and other electrical faults. Ensuring their proper storage is essential to maintain their performance and longevity. In this blog, I'll delve into the special requirements for storing a moulded case circuit breaker.
Environmental Conditions
Temperature
Temperature is a critical factor when it comes to storing moulded case circuit breakers. Extreme temperatures can have a detrimental impact on the internal components of the breaker. High temperatures can cause the insulation materials to degrade over time. This degradation may lead to a decrease in the dielectric strength of the insulation, increasing the risk of electrical breakdown. On the other hand, low temperatures can make the materials brittle, which may cause cracks or other physical damage during handling.
For most moulded case circuit breakers, the recommended storage temperature range is between -25°C and 55°C. It's important to note that if the breaker is stored in an environment where the temperature frequently fluctuates outside this range, it can accelerate the aging process of the components. For instance, a breaker stored in an uninsulated shed where summer temperatures can soar above 55°C and winter temperatures can drop below -25°C will likely have a shorter lifespan compared to one stored in a temperature - controlled environment.
Humidity
Humidity is another environmental factor that needs careful consideration. High humidity can lead to the formation of condensation on the surface of the circuit breaker. Condensation can cause corrosion of the metal parts, such as the contacts and the frame. Corrosion can increase the contact resistance, which in turn can lead to overheating during operation. Overheating can further damage the internal components and reduce the overall performance of the breaker.
Ideally, the relative humidity in the storage area should be maintained between 10% and 90% non - condensing. If the humidity is consistently high, it may be necessary to use dehumidifiers in the storage facility. Additionally, the circuit breakers should be stored in sealed packaging or containers to minimize the exposure to moisture.
Dust and Contaminants
Dust and other contaminants can accumulate on the surface of the moulded case circuit breaker. These particles can enter the internal mechanisms of the breaker and interfere with its normal operation. For example, dust can get into the moving parts of the trip unit, causing it to malfunction. Contaminants such as chemicals or abrasive particles can also damage the insulation and the conductive parts.
The storage area should be kept clean and free from excessive dust. It's advisable to store the breakers in a closed cabinet or a dedicated storage room. If the breakers are stored in a factory environment where there is a lot of dust and debris, they should be covered with protective covers to prevent contamination.
Physical Storage Conditions
Packaging
Proper packaging is essential for protecting the moulded case circuit breaker during storage. The original packaging provided by the manufacturer is designed to offer a certain level of protection against physical damage, moisture, and dust. If the original packaging is damaged or lost, it's recommended to use appropriate alternative packaging materials.
For example, a sturdy cardboard box with cushioning materials such as foam or bubble wrap can be used to protect the breaker from impacts. The packaging should also be labeled clearly with information about the breaker, including its model number, rating, and any special handling instructions.
Orientation
The orientation of the circuit breaker during storage can also affect its performance. Some breakers have internal components that are sensitive to the direction of gravity. For instance, if a breaker is stored in an inverted position for an extended period, it may cause the oil or other fluids (if any) inside the breaker to leak or settle in an improper way.
It's generally recommended to store the moulded case circuit breaker in the same orientation as it is designed to be installed. This ensures that the internal components are in their proper positions and that there is no undue stress on any particular part of the breaker.
Stacking
When stacking multiple moulded case circuit breakers, care must be taken to avoid overloading the bottom breakers. Excessive weight on the bottom breakers can cause physical damage to the frames and the internal components. The stack should be stable and not exceed the maximum stacking height recommended by the manufacturer.
In addition, the breakers should be stacked in a way that allows for easy access and inspection. If the stack is too high or unstable, it can be difficult to retrieve a specific breaker when needed, and there is a risk of the stack collapsing, which can cause damage to the breakers.
Long - Term Storage
Maintenance Checks
For long - term storage, periodic maintenance checks are necessary. These checks can help detect any potential issues early on and prevent major problems from occurring. Every six months, the circuit breakers should be visually inspected for signs of corrosion, damage, or any other visible defects.
If any issues are detected, appropriate measures should be taken immediately. For example, if there is minor corrosion on the contacts, they can be cleaned using a suitable cleaning agent. If there is a crack in the insulation, the breaker may need to be replaced or repaired by a qualified technician.
Function Testing
In addition to visual inspections, function testing should be carried out periodically for long - term stored breakers. Function testing can help ensure that the breaker will operate correctly when it is put into service. However, function testing should be done carefully to avoid damaging the breaker.
It's recommended to follow the manufacturer's instructions for function testing. In some cases, it may be necessary to use specialized testing equipment to accurately assess the performance of the breaker.
Conclusion
Storing a moulded case circuit breaker requires careful attention to environmental and physical conditions. By maintaining the proper temperature, humidity, and cleanliness, and by following the correct packaging, orientation, and stacking procedures, the performance and longevity of the circuit breaker can be ensured. For long - term storage, regular maintenance checks and function testing are essential.
If you are in the market for high - quality moulded case circuit breakers, we are here to assist you. Our products, such as the Mccb Molded Case Circuit Breaker, Abb Molded Case Circuit Breaker, and Moulded Case Breaker, are designed to meet the highest industry standards. Contact us for more information and to discuss your specific requirements. We look forward to partnering with you for your electrical needs.
References
- Electrical Equipment Storage Guidelines - Industry Standards Handbook
- Manufacturer's Manuals for Moulded Case Circuit Breakers