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Here's what PartsBase customers are saying

PartsBase is a very useful tool I take advantage of every day. When it comes to sourcing parts I operate on urgent AOG requirements. PartsBase provides me with so many useful tools and diverse vendors to make sure I can satisfy all my requirements.

Zachary Baker 
Emergency Response Coordinator

Jimmy White
Operations Manager APU Shop

I understand firsthand why companies use PartsBase.The PartsBase team is exceptional and the system is top notch. I truly appreciated all the support over the years.

At Duncan Aviation Parts & Rotable Sales, we receive thousands of calls from customers wanting to buy parts because they found us in PartsBase.

Chris Gress 
Parts & Rotable Sales Manager

Aviation Circuit Breaker & Aircraft Parts For Sale

Aircraft circuit breakers play a crucial role in ensuring the electrical safety and proper functioning of an aircraft. Understanding how these components work and their different categories is essential for the maintenance and operation of aircraft systems. 

This article provides an in-depth look at aircraft circuit breakers, explaining their significance in aircraft safety, maintenance, and inspection procedures, as well as future developments in this vital technology. But first, what are aircraft circuit breakers? 

What are Aircraft Circuit Breakers?

In the event of an electrical fault, circuit breakers prevent excessive current from damaging sensitive components or causing fires acting as the first line of defense against potential hazards. They are vital for the safeguarding of multiple aircraft systems including: 

  • Avionics systems

  • Lighting systems

  • Communication systems

  • And navigation equipment.

Furthermore, circuit breakers allow for easier troubleshooting and maintenance, allowing technicians to easily identify the faulty circuit. But now that we have a better understanding about what aircraft circuit breakers are, let’s look at some of the main benefits they offer.

The 5 Main Benefits of Circuit Breakers in Aircraft Safety

There are multiple benefits that can be obtained by installing circuit breakers into an aircraft, and rest assured that they are vital for the correct functioning of any airborne vehicle. Let’s take a closer look at some of the benefits that circuit breakers offer in regard to aircraft security. 

  1. They ensure that the electrical systems onboard are adequately protected, allowing potential hazards to be effectively addressed.

  2. The proper functioning of flight-critical systems relies on the integrity of circuit breakers. 

  3. The risk of in-flight electrical failures is significantly reduced, enhancing passenger safety.

  4. They allow pilots and technicians to implement measures to prevent malfunctions or fires. 

  5. They provide protection for lesser systems that are in charge of the passengers comfort and convenience. 

From protecting critical flight systems to preventing electrical overloads and fires, circuit breaker categories play a crucial role in ensuring electrical safety onboard aircraft. But to further understand how these elements work, let’s take a look at the main three types of circuit breakers. 

The 3 Main Types of Aircraft Circuit Breakers

When it comes to aircraft circuit breakers, there are different categories that serve specific purposes. Let's take a closer look at each category and their significance in ensuring the safe operation of an aircraft.

Type 

Characteristics 

Category A 

They are critical for protecting systems like flight controls, autopilot, communication equipment, anti-icing systems and navigation systems, by handling high currents and withstand extreme conditions.

Category B

They protect systems that are not essential for flight, such as interior lighting, entertainment systems, and galley equipment, ensuring the passenger’s comfort.

Category C

They are designed for ground power and protect the aircraft while it is connected to external power sources on the ground,  allowing systems to receive power without solely relying on internal aircraft systems.


Understanding the different categories of aircraft circuit breakers is essential for aviation professionals to ensure the proper functioning of critical systems and the overall safety and comfort of passengers.

So the next time you board an aircraft, take a moment to appreciate the intricate electrical system that keeps you safe and comfortable. But now that you understand what aircraft circuit breakers are, their importance, and the different types, let’s look at how to maintain them.

The 5 Steps to Maintain Aircraft Circuit Breakers

The maintenance and inspection of aircraft circuit breakers play a vital role in ensuring the safe operation of an aircraft. So let’s take a look at some regular inspection procedures that are essential to ensuring the proper functionality of aircraft circuit breakers. 

Step 1 | Visual Examinations

Visual examinations involve inspecting the circuit breakers for any signs of damage, such as cracks, charring, or loose connections. Additionally, the inspectors check for any signs of overheating, which may indicate a potential issue with the breaker.

Step 2 | Electrical Testing

Electrical testing is then performed to assess the performance of the circuit breakers, which involves measuring the current-carrying capacity of the breakers and ensuring that they trip at the correct current level. Any deviations from the specified values can indicate a faulty breaker that needs to be addressed.

Step 3 | Verifying the Correct Labeling

Verifying the correct labeling of circuit breakers is crucial for easy identification and troubleshooting. Each breaker should be clearly labeled with its corresponding electrical system or equipment to ensure quick and accurate identification during maintenance or in case of an electrical fault.

Step 4 | Identifying Potential Issues

Despite being designed to withstand demanding conditions, aircraft circuit breakers can still develop issues over time. It is essential to identify and address these issues promptly to maintain optimal circuit breaker performance. 

During inspections, any signs of corrosion should be carefully addressed, and affected breakers should be cleaned or replaced as necessary. Over time, the mechanical components of the breakers can also experience wear and tear. Regular servicing and lubrication of mechanical parts can help prevent this.

Step 5 | Replacing Parts

Factors such as aging, prolonged usage, or exposure to extreme temperatures can also lead to a decrease in the breaker's performance. If any deviations are observed, the affected breaker should be replaced to maintain the desired level of safety and reliability.

By following proper inspection procedures and promptly addressing common issues, the integrity and functionality of these critical components can be maintained, contributing to the overall safety and reliability of the aircraft.

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The 3 Future Advancements in Aircraft Circuit Breaker Technology

The evolution of aircraft circuit breakers is a continual process. Technological advancements are aimed at improving system reliability, reducing weight, and increasing fault protection capabilities. Let’s look at some examples: 

  1. The incorporation of advanced materials, such as solid-state technology, which offers improved response times and heightened accuracy, enhancing the overall safety and efficiency of aircraft electrical systems.

  2. The development of intelligent circuit breakers, which will be equipped with sensors and microprocessors that can detect and analyze electrical anomalies in real-time, enabling proactive maintenance and troubleshooting.

  3. The use of nanotechnology in circuit breaker design, which will allow them to be made smaller and lighter without compromising their performance. 

But it's not just about safety. These advancements also have significant implications for efficiency and cost-effectiveness. With real-time monitoring and diagnostics, airlines can optimize maintenance schedules, reducing downtime and maximizing aircraft availability.

Last Thoughts on Aircraft Circuit Breakers

Aircraft circuit breakers are vital components that play a crucial role in ensuring the safety and proper functioning of electrical systems on aircraft. By understanding the various circuit breaker categories, their roles, and the importance of regular maintenance and inspection, aviation professionals can ensure the continued reliability and safety of these critical components.

However, the future holds even more exciting possibilities. Advancements in circuit breaker technology pave the way for a more robust and intelligent electrical system, enhancing aircraft safety and efficiency in the years to come.

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