The bearing sleeve and pin shaft of 110kV circuit breaker spring operating mechanism were broken in the combination parts of energy storage shaft and CAM in the low electric pressure split and close test. The macroscopic morphology, hot acid erosion and microstructure of the mechanism were observed.The test results show that there are grinding cracks left in the inner surface of the bearing sleeve of the energy storage shaft and cam combination parts. When the split-and-close test is carried out, the energy storage retaining button and the bearing sleeve exert large mutual extrusion stress. The pin bearing in the energy storage shaft and cam combination parts is broken by bending stress, which leads to the fracture of the cylindrical ball roller and the bearing sleeve.
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