Abstract-The statistics of International Meeting shows that most circuit breaker faults comes from mechanical side, so it is of great significance to do research on mechanical fault diagnosis. The implementation of circuit breaker mechanical properties on-line monitoring is an inevitable trend of the development of state maintenance mechanism, it is also an important part of intelligent circuit breaker research in the future. According to the requirement of the smart grid in national construction, it has more advanced demands to intelligent circuit breaker on-line monitoring. The demands not only include monitoring on contact temperature rise and current of the circuit breaker, but also include on-line monitoring of circuit breaker mechanical properties. So this paper designs an on-line monitoring device to measure the mechanical properties of circuit breaker. It is proved that it can meet the requirements of on-line monitoring of mechanical properties after practice.

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