How To Test Circuit Breaker Contact Resistance

By | September 5, 2022



Testing circuit breaker contact resistance is an important part of maintaining the safety of electrical systems. Circuit breakers are designed to protect against overcurrents, voltage spikes, and other dangerous conditions that can damage equipment and put people at risk. By testing the integrity of the contact points, you can ensure that the breaker is able to do its job effectively.

When it comes to testing circuit breaker contact resistance, the process is relatively simple. The most common method for testing is to use a multi-meter set to measure resistance in ohms (Ω). To test, simply disconnect all power sources from the circuit breaker and then touch the leads of the multi-meter to the two main contact points on the breaker. The resistance reading should be within a range provided by the manufacturer. If not, the breaker should be replaced.

In addition to using a multi-meter to test circuit breaker contact resistance, you can also use a process called “burnout”. This involves connecting a high-voltage, low-current resistance tester to the circuit breaker and slowly increasing the current. As the current is increased, the contact point will be heated until it fails (burns out), which will indicate a faulty breaker.

Finally, certain circuit breakers have built-in features that allow them to be tested without having to disconnect them from the power source. These types of breakers can be tested with a voltage tester to check the voltage drop across the contact points. Again, this should be done within the manufacturer’s specifications.

Testing contact resistance for circuit breakers is an easy process, but it’s important to take all the necessary steps to ensure that the breaker is functioning properly. Regular testing and maintenance will help keep your electrical system safe and reliable for years to come.


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