A tripping device with adjustable protection level used in molded case circuit breakers

Abstract

The invention relates to protection level adjustable tripping devices for a molded case circuit breaker. The tripping devices comprises tension springs, a sliding adjusting button, a supporting part, adjusting drawing bars, adjusting screws, nuts, sleeves, movable iron cores, magnetic coils, static iron cores, magnet yokes, bases, compression springs, tripping parts and tripping drawing bars. The ends of the tension springs are connected with the adjusting screws, and the other ends are connected with the adjusting drawing bar. The ends of the sliding adjusting buttons are connected with the adjusting drawing bar, and the other ends are snapped at corresponding positions of the supporting part. The movable iron cores are formed by threaded connection of the adjusting screws and the sleeves, the ends of the adjusting screws are connected with the tension springs, and the other ends are in threaded connection with the sleeves. The magnetic coils and the static iron cores are arranged in rectangular cavities formed by magnet yokes and the bases, and the static iron cores are fixed below the movable iron cores. According to the device, the structure is simple, tripping is reliable, the multi-current-level adjustable function is achieved, and the production efficiency and the verification efficiency are greatly improved.

Description

technical field [0001] The invention belongs to the field of electromechanical manufacturing, in particular to a tripping device with adjustable protection level used in a molded case circuit breaker. Background technique [0002] When the molded case circuit breaker on the market is short-circuit protected, the thermal-magnetic trip direct-acting instantaneous action protection relies on the large current generated by the short circuit to attract the moving iron core through the magnetic force generated by the coil to drive the drawbar to achieve tripping protection. In this device, the moving iron core is usually supported by a compression spring to maintain an air gap. Functional requirements of the circuit breaker: the release must be able to trip within the set current range, and the rated current of different specifications can be matched by replacing the compression springs of different specifications. In this way, the requirements for the magnetic force of each pole...

AI Technical Summary

Problems solved by technology

In this way, the requirements for the magnetic force of each pole of the product and the accuracy of the spring are very high. Since the entire thermal-magnetic release is calibrated after assembly, if there is an unqualified product (early movement or non-movement), the product cannot be inspected. For on-site adjustment, the product can only be disassembled and calibrated after replacing the spring, which greatly affects the production efficiency in the production process and causes unnecessary waste of manpower and material resources

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