How should a circuit breaker be properly tested?

A circuit breaker should be properly tested using a multimeter to measure voltage and check for continuity. This method allows the technician to ensure that the breaker is functioning as intended. By measuring voltage, the technician can confirm that the breaker is allowing current to pass through when closed, indicating a proper connection. Additionally, checking for continuity ensures that the internal components of the breaker are intact and that there are no interruptions in the circuit that could indicate a faulty breaker.

Using a multimeter is critical because it provides precise measurements that can detect issues that may not be visible through a simple visual inspection or mechanical operation. This level of testing is essential to prevent faults or failures that could lead to electrical hazards or equipment damage.

Other methods, such as just inspecting the physical condition of the breaker or turning it on and off repeatedly, may not provide a comprehensive assessment of its operational integrity. Checking the heating of the breaker under load can indicate excessive current flow but does not reliably assess the breaker's ability to trip under fault conditions or its overall performance. Thus, using a multimeter is the most effective means for testing a circuit breaker thoroughly.