Operating mechanism of low-voltage circuit breaker

Abstract

An operating mechanism of a low-voltage circuit breaker belongs to the technical field of low-voltage apparatuses. The operating mechanism comprises a tripping lever, a locking lever, an upper connecting rod, a lower connecting rod, a handle lever, a connecting shaft, a side plate, a main spring, a rotating shaft and a public pivot shaft. A re-buckling pushing piece is arranged on the handle lever. A first hinging part hinged with the upper connecting rod and a second hinging part hinged with the side plate are arranged on the tripping lever, and a limiting piece is arranged on the upper connecting rod, so that the tripping lever and the upper connecting rod are kept in a fixed relative position relationship. When the upper connecting rod and the lower connecting rod are in the tripping state position of the circuit breaker and the handle lever is in the closing position, the central point of the first hinging part is located on the side, facing the locking lever, of the main spring. Meanwhile, the re-buckling pushing piece is located on the side, away from the locking lever, of the connecting line of the center point of the second hinging part and the center point of the first hinging part. The operating mechanism has the advantages that the requirement for miniaturization of a circuit breaker can be met while a four-bar linkage mechanism design is integrally kept in the process of completing the tripping action.

Description

technical field [0001] The invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to an operating mechanism of a low-voltage circuit breaker. Background technique [0002] The main functional components of the circuit breaker include contact system, operating mechanism, tripping device, handle and shaft. When the tripping device of the circuit breaker detects abnormal current in the circuit, the operating mechanism is activated to unlock and trip. The moving and static contacts are separated from each other to break the fault current in the circuit to achieve the purpose of protecting the circuit; when the circuit fault is eliminated, the circuit breaker must first be re-clamped to reset the operating mechanism, and then the closing operation is performed to complete the circuit. Reconnect. Conventional low-voltage circuit breakers have a variety of operating mechanisms, generally including handle levers, main springs, jumpe...

AI Technical Summary

Problems solved by technology

However, there are still defects in this improvement scheme: the range of action of the jumper has changed greatly, so that after the tripping action is completed, when the re-buckle operation is performed, the area where the push shaft is set needs to be moved to the outside by a large margin, thus increasing the The width of the space occupied by the mechanism makes it very limited in miniaturized products

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