Relay is an automatic switch element with isolation function, which is widely used in remote control, telemetry, communication, automatic control, mechatronics and power electronic equipment, and is one of the most important control components.
Generally Relays have an induction mechanism (input part) that can reflect certain input variables (such as current, voltage, power, impedance, frequency, temperature, pressure, speed, light, etc.); There is an actuator (output part) that can realize "on" and "off" control of the controlled circuit; Between the input part and the output part of the relay, there is an intermediate mechanism (drive part) for coupling and isolating the input, functional processing and driving the output part.
As a control element, in summary, the relay has the following functions:
（1) Expand the control range: For example, when the control signal of the multi-contact relay reaches a certain value, it can be changed, broken, and connected to the multi-circuit at the same time according to different forms of the contact group.
（2) Amplification: For example, sensitive relays, intermediate relays, etc., can control a large power circuit with a very small control amount.
（3) Integrated signal: For example, when multiple control signals are input into multi-winding relays in the specified form, the predetermined control effect is achieved through comparative integration.
（4) Automatic, remote control, monitoring: for example, the relay on the automatic device, together with other electrical appliances, can form a program control line, so as to achieve automatic operation.
Industry development prospect：
In the past ten years, China's information industry has developed at three times the speed of other industries, and the communication and automobile industries are also developing at the speed of one thousand li a day, while the home appliance industry has begun to appear as an important demand driver. With the overall improvement of product quality life in mainland China, more and more consumers are interested in new or upgraded home inductors, which in turn stimulates the demand for relays.
The "China current relay industry market outlook and investment planning analysis Report Outlook" released by the Forward-looking Industry Research Institute shows that the amount of relays in the above industries is considerable, and with the development of these industries, it will undoubtedly promote the further expansion of the relay market. In 2010, although the number of relay exports decreased, the export value increased, indicating that the added value of export relays increased. At present, the high value-added products of the relay industry have been greatly improved, and imported products have been gradually replaced in some areas.
With the gradual implementation and deepening of China's ten major industrial revitalization policies, the demand and application fields of relays will continue to expand and expand in the consolidation. During the "Twelfth Five-Year Plan" period, China's traditional electromechanical relays will maintain a growth rate of not less than 7%-8%, the development rate of solid-state relays will be close to 15%, and special relays will develop rapidly at a speed of more than 20%.
According to the analysis of the relay industry research group of the Prospective industry Research Institute, the pace of transformation of China's relay industry from "manufacturing power" to "creating power" will gradually accelerate, and the situation will become increasingly prominent from export to domestic demand, and exports will keep pace, especially after the improvement of high-end products, the trend of domestic demand will be more clear.
It is worth noting that the "triple play", especially the "Internet of Things" and the development of 4G, will enable new relays such as optical relays and high-frequency relays to achieve greater and faster development, and become a new growth highlight of the relay industry during the "Twelfth Five-Year Plan" period.
