When an ACB (air circuit breaker) detects a fault, it rapidly cuts the current flow in the circuit and extinguishes the electric arc using high pressure air.
As a result, they are appropriate for application in a wide range of commercial and residential applications too.
Keep on reading to learn more about how ACB works in detail, including benefits, troubleshooting, and much more.
ACB has multiple components that contribute to its working principle, such as:
When an issue arises, the primary and arcing contacts separate from one another. This separation is activated by the trip unit, which consists of thermal or overcurrent relays, when the current surpasses the limit because of an overload or short circuit.
However, this separation creates an electric arc. Therefore, the blast valves open, allowing high-pressure air to flow through the arc contacts and chute. This helps cool it down and makes the electric arc smaller, ensuring that the electric flow is interrupted safely. This video might help you better understand and visually picture the ACB’s process.
| Type | Operation | Application |
| Plain Break ACB | The most common type, which featured two contacts that disconnected from one another to prevent current flow. They use simply the air and arc chutes to extinguish the electric arc. | Commonly used for low voltage (below 450v) and applications that do not require advanced features. |
| Magnetic Blowout ACB | It has blowout coils that create a magnetic field, which creates a Lorentz force. This rapidly pulls the electric arc closer to the arc chute, where it is more effectively extinguished by the air inside. | Preferable for applications that involve high electric flow because it provides superior protection and extinguishment against short circuits or overload. |
| Drawout ACB | Their tripping mechanism is comparable to Plain Break ACB. However, this design makes it simple to remove them from the enclosure for maintenance or replacement. | Suitable for industrial environments that need frequent, necessary modifications and maintenance. |
They’re a device that protects electrical systems against various errors, including overloads and short circuits. Furthermore, they can handle huge amounts of electricity and frequently have adjustable trip settings. This makes them suitable for many industrial applications.
Lastly, they’re considered more environmentally friendly and safe since they use air instead of oil or chemicals to put out the electric arc.
One of the most common problems you might encounter in using these devices is “nuisance tripping.” This can lead to unnecessary blocking of the electricity flow, which disrupts operations. Therefore, consider adjusting the trip settings or checking if they currently have poor insulation resistance and faulty connections, causing the sensors to give false readings when there is no overcurrent or short circuit.
If the device fails to trip when there is an electrical fault, such as an overcurrent, verify whether the ambient conditions are ideal for them, as they are also sensitive to extreme heat or humidity. Furthermore, ensure that all components and connecting lines, including sensors such as thermal relays, are properly tightened, positioned and not damaged.
Whenever the issue continues, see the manufacturer’s manual for troubleshooting tips, or replace the ACB if necessary.
ACB is noted for its energy efficiency since it can quickly stop large currents and reduces possible electricity loss during electric system errors. However, several components use energy until the arc is split and cooled, causing ACB’s losses during operation.
But one of the growing trends is that a lot of manufacturers are incorporating environmentally friendly practices when producing their products, including ACB, through using:
Furthermore, some manufacturers are also integrating unique technologies in their circuit breakers like IoT (Internet of Things) to enhance their ease of use for customers. Although integrating such technologies is still rare today.
If you’re seeking a manufacturer with extensive experience in circuit breakers, IALLWay could be the one for you. iALLWay provides several types of ACB that can be adjusted to your specific needs, including:
Thus, don’t hesitate to seek professional guidance from iALLWay and even get a quote now for your electrical system.
Resources:
Troubleshooting Common ACB Problems
Working Principles & Benefits of Air Circuit Breakers
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