Industrial Connector Selection-2
【3】IEC standard classification
Because industrial connectors are used in many occasions and the usage conditions are also very different, in order to facilitate selection and uniform standards, the International Electrotechnical Commission (IEC) has developed a selection "clock diagram".
This clock diagram is mainly designed according to the relative position of the keyway and the ground electrode
IEC 60309-2 "Clock Diagrams",
According to the CEE/IEC standard, only plugs and sockets with the same number of poles, voltage, frequency and rated current can be connected.
The disc is divided into four circles:
The numbers 1-12 in the innermost circle are the same as the scale of the watch.
The keyway for all industrial connectors is at the six o'clock position.
All industrial connectors have a grounded jack/pin.
Based on the keyway, at what hour the ground pin is, there will be a corresponding code in the model number of this connector.
Grounding, according to the pre-divided voltage and frequency areas.
The three circles outward are different pin classifications
Corresponding to the three pin classifications of 2P+E, 3P+E, and 3P+N+E.
Each sector has a different color
Colors are related to voltage and frequency.
【3.1】Anti-mistakes with grounding feet
There are three pin/pin forms of industrial connectors.
2P+E: L, N, PE
3P+E: L1, L2, L3, PE
4P+E: L1, L2, L3, N, PE
Each pin has a clearly marked polarity.
All connector lead-in keyways are at 6 o'clock,
The position of the ground pin of the connector is also different depending on the applied voltage and frequency.
According to different working voltages and frequencies, the grounding pins are arranged at different angles relative to the keyway, which can avoid the mixed insertion of different applications and prevent electrical accidents caused by different voltages or frequencies.
Three different connectors as shown below
6-point plug: 4P+E, 380V, 50Hz, China standard power frequency power supply.
11-point socket: 4P+E, 450V, 60Hz, a wide range of marine power standards, including yachts.
9-point socket: 4P+E, 230V, 50/60Hz, voltage for some special equipment.
(Some countries have grids with multiple levels, such as Japan and the United States.)
For all connectors, the ground pin is thicker than the other pins.
They cannot be mixed.
First, the keyway positions are all at 6 o'clock.
Then, it can be seen that the ground pin is larger than the other pinholes, and it is impossible to insert the ground pin into other polarities by mistake.
Again, the angle of the connector pinholes at different "hours" is different and cannot be completely coincident, so it cannot be inserted.
【3.2】Color
Industrial connector housing, a total of six colors: red, blue, yellow, green, black, white.
Different colors represent different voltages and frequencies.
For example: green for high frequency 500Hz applications, black for high voltage 500~690V applications.
Red and blue are the most common specifications.
Three circles from the inside to the outside
Blue—Apply to 230V system 2P+E
Red—Apply to 400V system 3P+E
Red—Apply to three-phase five-wire system 4P+E
【3.3】Rated current
The rated current of industrial connectors generally have these specifications 16A, 32A, 63A, 125A
Different rated current specifications, different external dimensions, the corresponding plugs and sockets cannot be matched.
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