Miniature circuit breaker

Abstract

The invention discloses a miniature circuit breaker which has the advantages of low energy consumption, small size, low temperature rise, and simple structure, has larger change space in assembly with an auxiliary product, and has a wide application range. The miniature circuit breaker comprises a housing, an operating mechanism, a contact terminal mechanism, a switch actuating mechanism, a load terminal, a power source terminal arc-extinguishing hot tripping mechanism and a magnetic tripping mechanism; the hot tripping mechanism comprises a wire-in and wire-connection block, a temperature sensitive element and an arc striking piece which are riveted and fixed through first rivets; an adjusting screw is directly arranged at the top of the temperature sensitive element; the magnetic tripping mechanism comprises the wire-in and wire-connection block and a static contact which are integrally formed; a magnetic yoke is riveted on the static contact through a second rivet; a fixed shaft is arranged on the magnetic yoke; a counter-force torsion spring and an armature are sleeved on and penetrate the fixed shaft; and one end of the counter-force torsion spring is fixed and the other end of the counter-force torsion spring is propped against the armature.

Description

technical field [0001] The invention relates to a low-voltage device, in particular to a miniature circuit breaker. Background technique [0002] Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. The division of high and low voltage boundaries is relatively vague. Generally, those above 3kV are called high-voltage electrical appliances. Low-voltage circuit breaker, also known as automatic switch, commonly known as "air switch", also refers to low-voltage circuit breaker. It is an electrical appliance that not only has the function of manual switch, but also can automatically protect against voltage loss, undervoltage, overload, and short circuit. It can be used to distribute electric energy, start asynchronous motors infrequently, protect power lines and motors, etc., and can automatically cut off the circuit when they have severe overload, short circuit and undervoltage faults. Its function is e...

AI Technical Summary

Problems solved by technology

[0003] Miniature circuit breakers, referred to as MCBs, are the most widely used terminal protection devices in building electrical terminal distribution devices. The width of 125A miniature circuit breakers currently in circulation in the industry is not less than 25mm, with large energy consumption, large volume, and high temperature rise. , the structure is complex and the auxiliary products can be assembled with little space for change, and the scope of use is limited

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