Miniature residual current operated circuit breaker

Abstract

The invention discloses a miniature residual current operated circuit breaker. The number of poles is two. The miniature residual current operated circuit breaker consists of an electric leakage trip unit and a circuit breaker, wherein the electric leakage trip unit and the circuit breaker are of an integral overall structure; the lengthening design is utilized for the electric leakage trip unit at a load end; the two-segment type structure of a power end and the load end is adopted for an intermediate base; main circuits of two poles both have short circuit, overload and electric leakage protection functions; mutually independent indication devices are arranged and do not mutually interfere; an electric trip rod slides in a guide groove of a shell through a guide bar; innovative arc initiation structures of a bent equidistant-two-surface cambered plate and the like are adopted for an arc initiation device. The miniature residual current operated circuit breaker provided by the invention has the advantages that the size is ingenious; the structure is compact, concise and reasonable; the industrial automatic production and assembly are convenient; the working state is indicated clearly and accurately; the working stability and reliability are higher; the breaking capacity is high; the service life is long; the dual loop protection is achieved; the miniature residual current operated circuit breaker is more complete and safer.

Description

technical field [0001] The invention relates to the field of low-voltage electrical technology, in particular to a small residual current operated circuit breaker. Background technique [0002] The residual current operated circuit breaker is a multifunctional circuit breaker that combines the function of detecting residual current and disconnecting the main circuit, and can also protect the circuit from overload and short circuit. Its basic working principle is leakage detection The element (residual current transformer) has a toroidal core on which is wound a secondary coil, the primary coil being the wire that passes through the inner hole of the core. During normal power consumption, if the three-phase power consumption is balanced, the magnetic field generated by the three-phase current in the transformer just cancels out. At this time, there is no current on the neutral line. Even if the three-phase power consumption is unbalanced, the three-phase The unbalanced curre...

AI Technical Summary

Problems solved by technology

[0003] At present, traditional domestic residual current operated circuit breakers generally adopt a multi-stage combined structure, each of which is an integral structure, and the residual current element, residual current tripping device and switching device are self-contained and independent of each other, and the internal wire connection is Using the terminal screw method, the product structure is complex, there are many parts, the volume is large, the stability and consistency of production assembly are not high, and the work stability and reliability are not good enough; in addition, the traditional residual current operated circuit breaker products currently only have L poles With overload and short-circuit protection function, the N pole adopts the design of straight-through or switchable neutral pole. With the rapid development of domestic urban and rural low-voltage power grids, traditional residual current operated circuit breakers are no longer very good regardless of their appearance and product performance. To meet the new changes of continuous development, it is urgent to develop a high-performance small residual current operated circuit breaker with compact size, simple and reasonable structure, high working stability and reliability, and convenient for industrial automatic production and assembly.

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