Common Circuit Breaker Tests for Reliability Assessment

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Circuit breakers need thorough diagnostics because of their critical role in an electrical system. Missing a fault can lead to lost time and serious damage to your assets. Here are some of the common circuit breaker tests done to ensure their reliability.


Circuit breaker contact resistance measurement test
 helps spot problems in breaker contacts like carbonization, welded contacts, contamination, corrosion and its current handling capability. Degraded contacts can lead to heat dissipation and eventual failure. This can also be dangerous because the contacts may not open if a power fault happens.

Circuit breaker contact operation time measures the speed of the breaker’s contacts to switch from one state to another. This test is done using a circuit breaker timer and is conducted to determine if the protective device is fast enough to protect the electrical system. Fast trip times are preferred because many devices cannot handle over currents for a long time.

Hipot testing is often conducted on vacuum bottle circuit breakers. This test is conducted to determine if the vacuum is still intact. The presence of air causes the breakdown voltage to be lowered and reduces the effectiveness of the device.

If you need circuit breaker test equipment, consider renting from Protec today. Call us at 1-866-352-5550 for a rental estimate.