how to check a circuit breaker



Circuit breakers are essential components of electrical systems as they protect the circuits from overloads and short circuits. These devices play a crucial role in maintaining the safety and efficiency of our electrical infrastructure. However, when a circuit breaker trips or fails, it can disrupt the power supply and cause inconvenience or even potential hazards in our homes or workplaces. Therefore, it is important to know how to check a circuit breaker and troubleshoot any issues that may arise. In this article, we will delve into the various aspects of checking a circuit breaker and understanding its functionality, enabling you to identify and resolve common problems efficiently.

Understanding Circuit Breakers:

Before delving into the process of checking a circuit breaker, it is important to have a basic understanding of its purpose and functioning. A circuit breaker is an electrical switch designed to automatically interrupt the flow of current when it exceeds the rated limit, preventing damage to the circuit or equipment. It comprises of a switch mechanism and a trip unit that detects and responds to abnormal electrical conditions.

Checking Circuit Breakers:

Now that we have a basic understanding of circuit breakers, let's explore the step-by-step process of checking them. It is crucial to ensure your safety by turning off the main power supply before inspecting or working on circuit breakers. Here's how you can check a circuit breaker effectively:

Step 1:

Visual Inspection

A visual inspection of the circuit breaker panel can provide important clues about its status. Start by examining the panel for any visible signs of damage, such as burnt or discolored components, loose connections, or signs of overheating. These could indicate issues with the circuit breaker or the electrical circuit itself. It is also important to check the integrity of the circuit breaker's enclosure and ensure that it is securely mounted.

Take note of any unusual smells, such as the scent of burning or melting plastic, which could suggest a serious issue. If you detect any of these signs, it is recommended to call a licensed electrician for further investigation and repairs.

Step 2:

Power Off

Before proceeding with the inspection, it is vital to turn off the power supply to the circuit breaker panel. Locate the main service panel in your home or workplace and flip the main switch to the "off" position. This will ensure a safe environment for working on the circuit breakers.

Step 3:

Determine the Affected Circuit

Identifying the circuit that is experiencing issues is an important step in checking a circuit breaker. Begin by making a note of any specific areas where the power loss has occurred. This could be a single room, a set of outlets, or specific appliances.

Once you have identified the affected areas, determine which breaker is responsible for controlling those circuits. Locate the corresponding breaker within the panel and make a mental note or label it for future reference.

Step 4:

Resetting the Circuit Breaker

Sometimes, circuit breakers trip due to temporary overloads or minor electrical faults. Resetting a tripped circuit breaker is often all it takes to restore power. To reset a circuit breaker, follow these steps:

1. Identify the tripped breaker: Look for a breaker that appears to be in the middle position or slightly off compared to others in the panel.

2. Turn off the breaker: Push the tripped breaker to the full "off" position before resetting it. This ensures a complete reset once it is turned back on.

3. Reset the breaker: Firmly push the breaker to the "on" position until you hear or feel a click. This indicates that the breaker has been successfully reset.

4. Observe the breaker: Observe the breaker for a few moments. If it immediately trips again, there may be an underlying issue that requires further investigation.

Step 5:

Testing for Continuity and Resistance

Once you have reset the circuit breaker, it is crucial to test its functionality to ensure it is operating correctly. This involves testing for continuity and resistance in the circuit. To do this, you will need a multimeter, which is a handheld device used to measure electrical values.

1. Set the multimeter: Set the multimeter to the continuity or resistance testing mode. Ensure it is within the appropriate range for residential or commercial electrical systems.

2. Safety precautions: Before proceeding, always remember to wear appropriate personal protective equipment (PPE), such as insulated gloves and safety glasses. Safety should be a top priority when working with electrical systems.

3. Test for continuity: Touch one probe of the multimeter to the hot wire or terminal of the circuit breaker and the other probe to the neutral wire or terminal. If the multimeter emits a continuous tone, it indicates that the circuit is closed and functioning correctly.

4. Test for resistance: Measure the resistance of the circuit by touching one probe of the multimeter to the hot wire or terminal and the other probe to the ground wire or terminal. A low resistance reading suggests a healthy circuit, while a high resistance reading may indicate a fault or damage.

5. Repeat the process: If you have multiple affected circuits, repeat the continuity and resistance tests for each circuit breaker to ensure all are functioning properly.


In summary, checking a circuit breaker is a vital skill that can help you maintain a safe and efficient electrical system. By performing a visual inspection, identifying affected circuits, resetting tripped breakers, and testing for continuity and resistance, you can troubleshoot common issues with ease.

If you encounter persistent problems or are unsure about any aspect of checking a circuit breaker, it is always recommended to seek assistance from a licensed electrician. Electrical systems can be complex, and professional expertise ensures that repairs are conducted safely and accurately.

Remember to prioritize your safety when working with electricity, and never hesitate to seek professional help if you are uncomfortable or uncertain about any electrical task. By understanding how to check a circuit breaker and ensuring regular maintenance, you can enjoy uninterrupted power supply and a secure electrical environment.


Just tell us your requirements, we can do more than you can imagine.
Send your inquiry

Send your inquiry

Choose a different language
Current language:English