SECONDARY LATCH MECHANISM FOR OPERATING MECHANISM OF CIRCUIT BREAKER

摘要

A two-level latch mechanism for operation mechanism of circuit breaker. The operation mechanism (107) comprises: a tripping component (100), a left side plate component (101), a right side plate component (104), a latch component (102), a half shaft component (103), a lever component (105) and a main shaft component (106). The tripping component, the latch component and the lever component are mounted between the left side plate component and the right side plate component. The half shaft component and the main shaft component penetrate through the left side plate component and the right side plate component and extend out of the left side plate component and the right side plate component. The tripping component, the latch component, the half shaft component, the lever component and the main shaft component move in linkage. The tripping component comprises a tripping buckle, a latch surface is provide on a second end of the tripping buckle. The latch component comprises a sheet metal piece (210) rotating about a rotation shaft (217) and a bearing (221) mounted on the sheet metal piece. The bearing is in contact with the latch surface, and the latch component limits the tripping component. The half shaft component comprises a half shaft (223), the sheet metal piece is in contact with the half shaft, and the half shaft component limits the latch component. The tripping component, the latch component and the half shaft component form a two-level latch.