Classification of Industrial Plugs And Sockets

Industrial plugs and sockets are mainly divided into industrial plugs, industrial sockets, industrial connectors (couplers) and appliance sockets. As shown in the following figure.

Industrial plug and socket specification

1. Rated current
According to GB/T 11919-2001, I series are used in China, namely, 16, 32, 63 and 125A.

2. Rated voltage
Voltage specifications are divided into two broad categories (voltage level using shell color display):
(1) less than 50V:20 to 25V (purple) and 40 to 50V (white);
(2) >50V: 100 to 130V (yellow), 200 to 250V (blue), 380 to 480V (red), 500 to 690V (black).
AC 220V and 380V are commonly used in domestic power grid.

3. Rated frequency
There are 50 and 60, 100~300, >300 to 500Hz. 50Hz is commonly used in domestic power grid.

4. Ground contact position
The rated voltage is greater than 50V, the location of the pole is 1~12 clock, determined by the rated voltage and frequency.
The commonly used ground pole position is 6 o'clock.

5. Pole number
(1) when the rated voltage is less than or equal to 50V, there are 2 poles (2P) and 3 poles (3P).
(2) when the rated voltage is more than 50V, the pole number of single phase and three phase power supply is different, so the socket or socket pole number is also divided into 3 poles (2P+), 4 pole (3P+) and 5 pole (3P+N+).

Protection rating of industrial plug and socket

Industrial plugs and sockets are generally divided into three types: IP44, IP55 and IP67.

1. IP44: it can prevent water spraying in all directions and the harm of more than 1mmm solid. The commonly used industry has automatic production equipment, packaging equipment, injection molding machine, stage lighting and sound, construction machinery, generator set, distribution cabinet and so on.

2. IP55: prevent low pressure water injection from all directions and prevent dust hazards. Commonly used industries are: car cleaning equipment, spraying equipment, and so on.

3. IP67: it can prevent immersion below 15cm (soaking time for 30 minutes) and completely prevent dust from danger. Common industries include mining machinery, outdoor sports facilities, transmission and distribution equipment, and so on.

Industrial plugs and sockets are characterized by high safety, reliability and international versatility. Therefore, it has been gradually paid attention to in China. Through the continuous promotion and application of more than ten years, industrial plug and socket has entered all walks of life, such as electric power, construction, port wharf, machinery industry and modern large building. Manufacturers also developed from the first few to dozens now. At the same time, with the development of science and technology, industrial plugs and sockets are constantly innovating. All kinds of rapid installation technology have been applied to plug and socket, making it more convenient.