Small-sized breaker

Abstract

The invention discloses a small-sized breaker, which mainly solves the problem of large tripping force between a trip and a latch in the conventional small-sized breaker. The small-sized breaker is characterized in that a lever (14) is arranged between a latch (8) and a trip (9), wherein a long arm end of the lever (14) is clamped with the latch (8), while a short arm end of the lever (14) is clamped with the trip (9). A space for arranging an electromagnetic zero-sequence current transformer is arranged in a shell of the small-sized breaker, and the electromagnetic zero-sequence current transformer with high performance is adopted, so that a channel structure of a movable contact and a middle shell is changed. The breaker improves the flexibility of electric leakage tripping under the condition of not changing the external structure and size of the shell of the conventional small-sized breaker and has the characteristics of compact structure, small tripping force and flexible tripping during electric leakage; and the protection effect can be achieved during the electric leakage and a circuit does not need extra voltage serving as power of the product in the work of the product.

Description

technical field [0001] The invention relates to a circuit breaker, which belongs to a small circuit breaker. Background technique [0002] Miniature circuit breakers refer to low-voltage circuit breakers used on AC 50 / 60Hz rated voltage 230 / 400V and rated current below 32A. They are often used in industrial, commercial, high-rise and residential buildings. In order to meet the needs of users, miniature circuit breakers usually have overload, short circuit and leakage protection functions. Buckle driver, moving contact, static contact and wiring terminals, the transmission mechanism is installed in the chamber between the upper and lower housings, and the inner lower part is separated by the middle housing to separate the 2-pole circuit. The transmission mechanism is mainly composed of lock, Jump buckle, bracket, moving contact frame, "U"-shaped connecting rod and handle. The bracket, "U"-shaped connecting rod and handle form a four-bar mechanism. There is a "V"-shaped groov...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of the background technology, the present invention provides a small circuit breaker, which mainly solves the problem that the tripping force between the jumper and the lock in the existing small circuit breaker is relatively large. The space of the type zero-sequence current transformer is adopted, and the electromagnetic type zero-sequence current transformer with better performance is adopted; the channel structure between the moving contact and the intermediate shell is changed

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