A Circuit Breaker Timer is a diagnostic instrument used to measure the operating time and performance of circuit breakers during opening and closing operations. It records parameters such as contact opening and closing times, pole synchronization, bounce time, and travel characteristics. These measurements help determine whether a breaker operates within manufacturer specifications and industry standards. The device connects to the breaker’s control circuit and main contacts to capture precise timing data at millisecond resolution. Circuit breaker timers are widely used in power plants, substations, and industrial facilities to ensure reliable fault interruption, system protection, preventive maintenance, and overall electrical network safety.