Co-directional serial double-break small circuit breaker

Abstract

The invention discloses a small molded case circuit breaker adopting co-directional serial double breakpoints, which comprises an operating mechanism, a contact device, an energy storage device, and acaging device. The energy storage device comprises a contact surface formed on a supporting part, a driving finger which is matched with the contact surface and co-directionally moves along with a handle of the operating mechanism, and an energy storage spring connected between a lever of the operating mechanism and a moving contact. The caging device comprises two bosses corresponding to two moving contact points of the moving contact respectively, and two surfaces which are formed on the lever of the operating mechanism and are matched with the two bosses respectively, and has the functionsof strengthening the uniformity of contact pressure of two breakpoints and the synchronous closing / breaking adaptability, so that the caging device can still keep reliable work under the condition ofinconsistent wear of contacts of the two breakpoints. The energy storage device and the caging device are non-independent devices, so a mechanism is greatly simplified, the space of the mechanism isreduced, the external dimension of a circuit breaker product fully meets the modular standard requirement and the volume is smarter.

Description

technical field [0001] The invention relates to a miniature circuit breaker with double break points in series, in particular to a miniature circuit breaker with double break points in series in the same direction. Background technique [0002] The miniature circuit breaker is a low-voltage terminal electrical appliance widely used in both industrial and civil fields. Its internal main components are the operating mechanism and contact device. By configuring the corresponding delay and instantaneous mechanism, it can realize the protection functions of opening and closing lines, overload and short circuit. . In the breaking technology, the short-circuit current is used to generate electric repulsion at the contacts of the moving and static contacts, so as to pull the arc in advance before the instantaneous mechanism acts, and rely on the arc resistance formed by the arc to achieve the purpose of current limiting. [0003] The contact devices of existing miniature circuit br...

AI Technical Summary

Problems solved by technology

The limit device is also used to solve the problem of breaking consistency of double breakpoints. The principle is to realize the simultaneous breaking of double breakpoints through the limit structure set in the mechanism, but it cannot solve the problem of breakage with more wear during use. Point hysteresis breaking problem

For small circuit breakers, the energy storage device and the limit device in the prior art also have the following defects: the energy storage device and the limit device are independent in structure and function, and their structure is complex and occupies a large space. It cannot meet the requirements of small size, modulus of length, width and height of miniature circuit breakers; it cannot solve the problem of the vicious circle of breakpoint closing / breaking hysteresis and contact wear, so in the case of inconsistent contact wear, the circuit cannot be maintained device works reliably

For example, the excessive height of ABB's S500 product not only makes the product too large, but also cannot meet the basic requirements of modularization.

Another example is the LH-125 product of Jinzhong Mule. Although it can meet the requirements of modularization, the excessive length size not only makes the product too large, but also makes the ratio of length, width and height out of balance, thus affecting the appearance and quality of the product. use

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