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The Circuit Breaker Timing Testing Set SMT-TT-11 is designed for precise measurement of circuit breaker performance. It evaluates switch-on and switch-off times, in-phase and phase-to-phase synchronization, and reclose timing sequences. Equipped with a microprocessor-based system, it ensures high accuracy and reliability. The touch LCD display provides an intuitive interface with three automatic testing modes: open time testing, close time testing, and open and close timing test. Operating on a 220V 50Hz power supply, it is suitable for laboratory use. This device is essential for professionals to assess circuit breaker functionality and ensure electrical system safety.