how to test a circuit breaker out of the panel



Circuit breakers are an essential component of any electrical system, as they protect the circuit from damage caused by excessive current. However, there may be instances when you need to test a circuit breaker outside of the panel. This could be because you suspect the breaker is faulty or simply as a part of routine maintenance. In this article, we will guide you through the steps of testing a circuit breaker outside of the panel.

So, let's dive in and explore how you can effectively test a circuit breaker to ensure its proper functioning and protect your electrical system.

Why Test a Circuit Breaker Outside the Panel?

Testing a circuit breaker outside of the panel offers several advantages. Firstly, it eliminates the risk of damaging other components in the panel during the testing process. Additionally, testing outside the panel allows for more convenient access to the circuit breaker, making it easier to perform various tests, measurements, and inspections.

Testing a Circuit Breaker Outside the Panel – Step by Step Guide

Testing a circuit breaker outside the panel involves a series of systematic steps to ensure accurate results and minimize the potential for accidents. Let's examine these steps in detail:

Gather the Necessary Tools and Equipment

Before you begin testing the circuit breaker, it is crucial to gather all the necessary tools and equipment. This will ensure a smooth testing process and accurate results. Some of the essential tools and equipment you will need include:

1. Multimeter: A multimeter is an electronic measuring instrument that can measure various electrical quantities such as voltage, current, and resistance. It is a crucial tool for testing circuit breakers.

2. Test Leads: These insulated wires with clips at the ends are used to connect the multimeter to the circuit breaker for testing purposes.

3. Safety Gloves and Glasses: Safety should always be a priority when dealing with electricity. Ensure you have the appropriate safety gloves and glasses to protect yourself from potential hazards.

4. Screwdriver: A screwdriver is necessary to remove the circuit breaker from the panel safely.

Step 1: Ensure Safety Precautions

Safety is paramount when working with electricity. Before testing a circuit breaker, make sure you take the following safety precautions:

1. Turn off the Main Power: Before handling any electrical equipment, turn off the main power supply to the panel to prevent electric shocks or accidents.

2. Use Personal Protective Equipment (PPE): Wear the necessary safety gloves and glasses to protect yourself from any potential hazards.

3. Ensure Proper Grounding: Make sure the circuit breaker and the equipment you are working with are properly grounded to minimize electrical risks.

Step 2: Locate and Disconnect the Circuit Breaker

Once you have taken the necessary safety measures, locate the circuit breaker you want to test. Turn off the branch circuit breaker supplying power to the specific breaker you intend to test. Then, use a screwdriver to carefully remove the circuit breaker from the panel. Handle the breaker with care to prevent any damage or injury.

Step 3: Inspect the Circuit Breaker

Before proceeding with the actual testing, perform a visual inspection of the circuit breaker. Look for any signs of damage, loose connections, or burnt marks. Pay close attention to the breaker's contacts to ensure they are clean and free from corrosion.

Step 4: Test the Circuit Breaker with a Multimeter

Using a multimeter, you can now start testing the circuit breaker. Follow the steps below:

1. Set the Multimeter: Set the multimeter to the appropriate setting based on the type of test you want to perform. For example, if you want to measure continuity, set the multimeter to the continuity or resistance mode.

2. Connect the Test Leads: Connect the test leads of the multimeter to the appropriate terminals on the circuit breaker. Ensure a secure connection by attaching the leads to the breaker's contacts or terminals.

3. Measure Continuity: Testing for continuity checks if the circuit breaker is allowing the flow of current when it should. Place one lead on the breaker's line terminal and the other lead on the load terminal. If the multimeter shows continuity (a low resistance reading), it means the circuit is complete, and the breaker is functioning correctly. However, if there is no continuity, it indicates a faulty circuit breaker that needs replacement.

4. Measure Voltage: To measure voltage, set the multimeter to the voltage mode. Connect one lead to the breaker's line terminal and the other lead to the ground. You should get a voltage reading that matches the rating of the breaker. If the reading is significantly different or zero, it indicates a faulty circuit breaker.

5. Measure Resistance: Resistance testing can help identify any irregularities within the circuit breaker. Set the multimeter to the resistance mode and connect the leads to the appropriate terminals. The resistance reading should fall within the manufacturer's specified range. If it is outside the range or reads infinite resistance, there could be an issue with the breaker.

Step 5: Reinstall the Circuit Breaker

After completing the testing process, and if the circuit breaker is found to be functioning correctly, it's time to reinstall it. Carefully place the breaker back into the panel and secure it using the screwdriver. Double-check that all connections are tight and secure.


Testing a circuit breaker outside of the panel is an important process to ensure the safety and functionality of your electrical system. By following the step-by-step guide outlined in this article, you can effectively test a circuit breaker and identify potential issues. Remember to always prioritize safety and take necessary precautions when working with electricity. Regularly testing and maintaining your circuit breakers will help prevent electrical accidents and ensure a reliable electrical system.


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