The birth of industrial plug and socketPlug in industrial plug socket is a common electrical accessory in daily use. It is necessary for all electrical appliances to operate. It can be said that plug and socket are the bridge between electrical appliances and power supply. The invention of electricity, especially the appearance of later electrical appliances, urgently needs a series of connectors to cooperate with it, so as to use electric energy. There was no plug and socket for a long time. For the sake of electrical connection, people could only twist the wires on the power terminals. However, with the emergence of a large number of electrical appliances, if you have to twist the wires every time, it is not suitable for the needs, and a large number of non professionals join in the use of the ranks, so there are a lot of security problems, which will cause serious electric shock accidents. This puts forward the requirement of convenient and fast electrical connection. In this case, plug and socket products came into being.Development of plug and socket product standardEarly plug and socket are very simple, and the size is not uniform, it can be said that there are many kinds of plugs. It is possible that one plug produced in one city can not be plugged into the local socket in another city. Therefore, since then, all countries in the world have formulated their own unified plug and socket standards. In 1967, Guangzhou Institute of electrical science mainly formulated the plug and socket standard gb1002-67 single-phase plug and socket types, basic parameters and dimensions. For example, Britain issued BS in 1950 546:1950 two pole plugs, sockets and converters with earth contacts for circuits up to 250V.The promulgation of these compulsory standards unifies the type and size of each internal plug and socket, and promotes the development of trade in a sense.Industry development historyThe products of industrial plug, plug and socket are developing continuously. At the beginning, they only meet the needs of simple power supply. For example, from the 1950s to the end of the 1970s, bakelite electrical appliance manufacturers in all provinces and cities of China produced plugs and sockets. At that time, the plug and socket products were mainly black phenolic resin powder (namely, electrical jade powder). Later, with the improvement of people's living standards, awareness and the need for beauty, people also put forward higher requirements for plug and socket.The rise of all kinds of plug and socketFor example, in order to prevent children from getting an electric shock by plugging something like a stick into the socket, it is required to install a protective door in front of the socket insert; there will be a large amount of water in the bathroom, in order to have a waterproof and splash proof plug and socket; in order to make the room beautiful and harmonious, there are a variety of wall sockets with color panels, etc. At present, a large number of intelligent, remote control and energy-saving switch and socket products are emerging.For example, switch socket with remote control and timing function; intelligent light control system with centralized control, scene control, remote control and other functions; intelligent home appliance control system with programming control, remote control and other functions, etc. Ground socket, converter, industrial plug socket, splash proof switch socket, waterproof switch socket, explosion-proof switch socket, leakage protection socket, lightning protection socket and other new products are competing.The emergence of humanized productsPlug and socket accessories have developed from a single functional product to a combination of functional and decorative products, and are increasingly pursuing operational and comfort. The appearance of these products indicates that the development of plug and socket products will be more and more humanized in the future.

We are a professional manufacturer of standardised IEC 60309 plug and socket, multiple sockets outlets, industrial connectors, distribution boxes, ac contactors and thermal overload relay with good price and high precision for industrial demands. But many people may be do not know about IEC 60309 and here is a brief introduction.IEC 60309 (formerly IEC 309 and CEE 17, also published by CENELEC as en60309) is a series of international standards of the International Electrotechnical Commission (IEC) on "plugs, sockets and couplers for industrial use". The standard allows a maximum voltage of 1000 V DC or AC; a maximum current of 800 a; and a maximum frequency of 500 Hz. The ambient temperature range is - 25 ° C to 40 ° C.There are a series of plugs and sockets of different sizes with different numbers of pins according to the current provided and the number of phases accommodated. These accessories are popular in the open air because they include IP44 weatherproof. They are also sometimes used in situations where they do not require their special functions (such as high current ratings or three-phase facilities) to prevent potential users from connecting household appliances to the socket because "normal" household plugs are not suitable.Environmental protectionIEC 60309-2 connectors are available in IP44 (splash proof), IP67 (waterproof) and IP66 / IP67 (spray proof / waterproof). In all cases, ratings are applicable at the time of separation or mating, but not during mating.The more common variant of the IP44 features a spring-loaded hinged cover on the socket. When inserting the plug, hook the cover onto the lug on the plug and fix it in place. Fixed joints are usually installed at a downward angle to prevent water from entering.The IP67 and IP66 / IP67 variants include a washer and a twist lock ring that seals the two connectors together.Preferred current rating and wire gaugeThis standard includes the preferred current ratings and wire gauges for International (as series I) and North American (as Series II) applications.Series I preferred current rating (AMPS): 16, 32, 63, 125, 250, 400, 630 and 800, wire gauge specified as mm2.Series II preferred current ratings (AMPS) are: 20, 30, 60, 100, 200, 300, 350, 500, and 600, with AWG and circular mils as the gauge designation.

Thermal overload relay and fuse are the most commonly used accessories in electrical materials. Many friends just think they are two kinds of products. They have no commonality, but they are not correct. There are similarities and differences between thermal relay and fuse. Now let's analyze them.FuseFuse is a kind of electrical appliance which breaks the circuit by fusing the melt with the heat generated by itself when the current exceeds the specified value. Fuse is a kind of current protector which is made according to the principle that after the current exceeds the specified value for a period of time, the fuse melts the melt with the heat generated by itself, thus breaking the circuit. Fuse is widely used in high and low voltage distribution system, control system and electrical equipment. As the protector of short circuit and over-current, fuse is one of the most commonly used protective devices.Thermal overload relayThermal overload relay (generally referred to as: thermal relay), when it is connected to the main circuit, flows through the same current as the motor, when the motor overload reaches a certain degree, the thermal elements are heated to a certain degree of bending, which promotes the action structure of the thermal overload relay. The action time of the thermal overload relay and the magnitude of the overload current change according to the inverse time limit relationship (as the thermal overload relay of the motor overload protection, it must ensure that the normal starting and operation of the motor are not affected, and can maximize the bearing capacity of the motor, so the action characteristic curve of the thermal relay should be located below the allowable heating characteristic curve of the motor, and close to it In it).DifferencesAll of them belong to current protection appliances and have inverse time characteristics. The fuse is mainly used for short-circuit protection and thermal relay for overload protection; the fuse uses the principle of thermal fuse, which requires a higher fuse factor for the solution; the thermal overload relay uses the principle of thermal expansion, which requires a higher expansion factor for the bimetal chip; the thermal overload relay protection has a greater delay, while the short-circuit protection requires that the action of the fuse must be instantaneous.To sum up, the difference between the two is very big. The specific choice depends on the use of the construction site.

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