Circuit Breaker Testing
Circuit breakers are designed and manufactured to operate correctly under a range of conditions. These include
switching currents up to the rated load, as well as interrupting overload or fault currents several times the rated
current.
Testing will usually be performed to ensure compliance with a local or international standard. Special tests may also
be performed by manufacturers to evaluate new designs. The tests that are common to most circuit breakers include:
Mechanical Operation
o Performance of the mechanism to open and close contacts
o Endurance of the mechanism
Electrical Operation
o Ability to operate safely with rated loads
o Ability to safely isolate overloads and short circuits