A molded case circuit breaker

Abstract

The invention discloses a molded case circuit breaker, and belongs to the field of circuit breakers. According to the key points of the technical scheme, the molded case circuit breaker comprises a shell, a breaking mechanism arranged in the shell and a thermo-magnetic tripping device, wherein the breaking mechanism comprises a moving contact structure, a static contact structure and a reset structure; the moving contact structure comprises a rotating shaft shell and a conductive clamping plate fixedly connected with the shell; the rotating shaft shell is rotatably connected with the conductive clamping plate; a moving contact is hinged to the conductive clamping plate; the rotating shaft shell is provided with a separating structure which drives the moving contact to rotate and is in contact with the rotating shaft shell in a butting mode, the length of the moving contact is larger than the distance between the rotating axis of the moving contact and the static contact structure, thereset structure comprises a pull cable with the end fixedly connected to the moving contact far away from the rotating shaft axis, and the pull cable is fixedly connected to the static contact structure through a buffer structure. The molded case circuit breaker has the effect of automatically resetting the moving contact.

Description

technical field [0001] The invention relates to the technical field of circuit breakers, more specifically, it relates to a molded case circuit breaker. Background technique [0002] The molded case circuit breaker can automatically cut off the current after the current exceeds the trip setting. Molded case refers to the use of plastic insulators as the casing of the device to isolate conductors and grounded metal parts. Molded case circuit breakers typically contain thermal magnetic trip units, while larger models have solid state trip sensors. [0003] At present, the Chinese invention patent with the notification number CN205069552U discloses a molded case circuit breaker contact repellent device, which is sequentially provided with a static contact support plate, a connecting plate, a U-shaped plate, a static silver contact, a moving silver contact, Moving contact, plate hole, first shaft, second shaft, spring, third shaft, rotating shaft and active actuator hole, the ...

AI Technical Summary

Problems solved by technology

The contact repellent device of molded case circuit breaker improves the breaking capacity, but does not increase the parts of the contact device, the structure is relatively simple, and there is no cost increase

[0004] The above-mentioned existing technical solutions have the following defects: under the action of electric repulsion, the movable contact is rotated against the elastic force of the torsion spring, and after the rotation, the second shaft is in contact with the outside of the spring angle, so that the spring is applied to the second shaft. The force changes, so that the moving contact rotates in the same direction as the electric repulsion force, so as to achieve the purpose of quick disengagement, but after disengagement, it needs to be manually reset, so that the second shaft conflicts with the inner side of the spring angle, resulting in the molded case The circuit breaker is inconvenient to use

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