Molded case circuit breaker tripping device

Abstract

The invention discloses a molded case circuit breaker tripping device, which comprises a shell, an operating mechanism and a tripping device. The tripping device comprises a short circuit instantaneous protection tripping device and a draw bar; the short circuit instantaneous protection tripping device comprises a keeper, an adjusting bar and a reaction spring; the adjusting bar is pivoted on the shell; and the reaction spring is connected with the adjusting bar and the keeper. When short circuit current flows through the tripping device, the keeper actuates the draw bar to be pivoted, and the draw bar unlocks the operating mechanism to actuate the circuit breaker to cut off the circuit. The shell is provided with an adjusting bar adjusting window, a sliding adjusting device is arranged at the adjusting bar adjusting window, the sliding adjusting device comprises a sliding piece and a sliding abutting bar arranged on the adjusting bar, and when the sliding piece slides and drives the sliding abutting bar arranged on the adjusting bar to enable the adjusting bar to rotate around an axial direction, the spring force of the reaction spring changes and an adjustable action current value of the short circuit instantaneous protection tripping device is realized. The reaction spring generates different tension forces, the reaction spring is adjusted, and the purpose of adjusting the short circuit current value is achieved.

Description

technical field [0001] The invention belongs to the technical field of circuit breakers, and in particular relates to a tripping device for a low-voltage molded case circuit breaker. Background technique [0002] The tripping device mentioned above mainly refers to the thermal tripping device, more precisely, it refers to the thermal magnetic tripping device (the industry is also used to call it "thermal magnetic tripping device"). There are two main structural forms of thermal-magnetic tripping devices: one is an overload long-time protection tripping device composed of metal thermal elements; the other is a short-circuit protection instantaneous tripping device in the form of an electromagnet. When an abnormal current in the circuit is detected, the tripping device acts and actuates the tripping of the circuit breaker to cut off the circuit. In addition, according to whether the current setting value of the circuit breaker is adjustable or not, it can generally be divided...

AI Technical Summary

Problems solved by technology

It is generally applicable to realize the cooperation between parts by adopting the rotating structure to meet the adjustment requirements for the preload of the reaction force spring, but the matching requirements of the helical surface through the instantaneous adjustment structure of the rotating structure are undoubtedly in design and manufacturing. It is very troublesome (that is, very inconvenient), because it is difficult for the helical surface to achieve self-locking under force, and it will inevitably rotate due to force, so it will inevitably affect the short-circuit protection characteristics

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