Is a kind of low-voltage electrical appliances according to the outside signal and request, manually or automatically connect and disconnect the circuit to realize the switching of the circuit and the electric or non object control, protection, detection, transformation and adjustment of components or equipment. In industry, agriculture, transportation, national defense and people＇s electricity consumption, most of them use low-voltage power supply. The development of low voltage apparatus depends on the development of economy and the development of modern industrial automation, as well as the research and application of new technology, new process and new material. As far as the worldwide application is concerned, low voltage apparatus is developing towards high performance, high reliability, miniaturization, modularization, assembly and general use of components.

Communication low voltage apparatus

With the development and application of computer network, low voltage apparatus controlled by computer network can communicate with

central control computer. For this reason, all kinds of low-voltage electronic devices come into being. Communication low voltage appliance will be one of the important development directions of low voltage apparatus in the future. In order to realize the connection of low voltage component and computer network, the following three schemes are adopted. The first is the development of new interface electrical appliances, between the network and the traditional low-voltage components. The second is to derive or increase the computer network networking interface on traditional products. The third is the direct development of a new type of electrical appliance with computer interface and communication function.

Intellectualization

In order to realize the bidirectional communication between the low voltage electric apparatus and the central control computer, the low voltage electric appliance must be developed to the electronic and electromechanical integration. Meanwhile, some electrical appliances are required to have intelligent functions. At present, the development of intelligent electrical equipment mainly in the universal circuit breaker, molded case circuit breaker, and motor control, protector and other products. The main feature of intelligent circuit breaker is equipped with intelligent release. The main features of intelligent AC contactor and starter are intelligent point system. The control circuit includes voltage detection circuit, pull in signal generation circuit and hold signal generator circuit. With the development of science and technology, more and more intelligent low voltage machines begin to appear in large factories.

High performance, energy saving and miniaturization

The high performance of a new type of low-voltage electrical appliances in addition to improve its technical performance, will also focus on the pursuit of comprehensive technical and economic indexes, such as low-voltage circuit breaker, circuit breaker short circuit in addition to improve the competence, will also pay special attention to reduce arcing distance. It also requires miniaturization, which is important for the development of a new generation of compact low-voltage equipment. For AC contactor, is not in the one-sided pursuit of electromechanical life improves, but focuses on the study of the function of the product combination and derivation, breaking action reliability, reliability, reliability andenergy saving aspects of contact.

The technical development of low voltage electric apparatus mainly depends on market technology demand, market competition demand, system development demand, and new standard research and application.