Small circuit breaker with protection of electric leakage, overload and short circuit

Abstract

The invention relates to a small circuit breaker with protection of electric leakage, overload and short circuit. The small circuit breaker mainly solves the problem that the existing double-wire small circuit breaker has poor tripping flexibility when in electric leakage and is characterized in that the coil frame (14) is arranged on the position of a lower shell (3) corresponding to a trip (9);a locking fastener (8) is provided with a baffle plate (20) corresponding to an inner top needle (18) of the coil frame (14); and a rotating shaft (28) of the trip (9) is arranged between the coil frame (14) and an upper shell (1). The small circuit breaker with protection of electric leakage, overload and short circuit improves the sensitivity of leakage tripping under the condition without changing the appearance structure and size of the shell of the original small circuit breaker. In addition, the small circuit breaker changes the shape of an arc extinguish chamber, improves arc extinguishperformance, further improves breaking capability of the circuit breaker, and is characterized by compact structure, high sensitivity of leakage tripping and high breaking capability.

Description

Technical field: [0001] The invention relates to a circuit breaker, which belongs to a small circuit breaker with leakage, overload and short circuit protection. 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 63A. They are often used in industrial, commercial, high-rise and residential buildings. Because the commonly used miniature circuit breakers have overload and short circuit protection functions but no leakage protection functions, Chinese patent ZL99206121.0 discloses a two-wire circuit breaker with a width of 18mm. This patent adds a leakage trip driver in the housing. One side of the housing is lengthened to expand the space of the housing, and then the coil of the leakage tripping driver is placed. Although the function of leakage protection is added functionally, due to the uncompact structure, the volume and shape of the housing are relatively large. ...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the background technology, the present invention provides a miniature circuit breaker with leakage, overload and short-circuit protection, which mainly solves the problem of poor tripping sensitivity when the existing two-wire miniature circuit breaker leaks electricity, without changing the original In the case of the shape and size of the shell of the miniature circuit breaker, the sensitivity of leakage tripping is improved; in addition, the shape of the arc extinguishing chamber is changed, the arc extinguishing performance is improved, and the breaking capacity of the circuit breaker is improved as much as possible. Features of compactness, high leakage tripping sensitivity and high breaking capacity

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