Circuit breakers test equipment safely switches off currents to prevent shortages, outages and the general havoc. A transient or severe fluctuation in current can wreak an electrical system. Circuit breaker testing equipment assesses several key parameters to circuit breaker functionality, including resistance, timing, minimum pick-up, travel and power factor. A circuit breaker tester should allow for energy to flow with minimum possible loss when it is not tripped and should be checked for corrosion or oxidation due to temperature or humidity stressors.