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IEC 60309 (formerly IEC 309) is an international standard from the International Electrotechnical Commission for plugs, socket-outlets and couplers for industrial purposes.
IEC 60309-2 specifies a range of mains power connectors with circular housings, and different numbers and arrangements of pins for different applications.

The following colour coding is used: yellow = 100-130V; blue = 200-250V; red = 380-480V. Purple and white housings are used for less than 100V, while black and green are reserved for 500V and up and frequencies exceeding 60 Hz.

IEC 60309-2 variants are designed so that a plug of one type can only be inserted into a socket of the same type. Different current ratings are distinguished by different diameters of the circular housing.

The 16A single and three-phase variants below are commonly used in Europe at campings, marinas, workshops and farms.
They are rarely used for indoor domestic purposes.

In the UK the IEC 309 standard was adopted as BS 4343 in 1968, and in 1999 replaced by the European equivalent BS EN 60309.
In Britain these heavy duty plugs are often referred to as CEE plugs or Commando plugs (refers to the MK Electric company Commando range of connectors).

 

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1 IEC 60309 230V, 16A single phase wall socket.
2 IEC 60309 230V, 16A single phase plug. The coding of the pins is shown at right; PE = Protective Earth
3 IEC 60309 230V, 16A single phase outlet to Schuko plug adapter.
4 IEC 60309 230V/400V, 16A three-phase wall socket.
5 IEC 60309 230V/400V, 16A three-phase plug, with pin coding at right. Three phases are respectively L1, L2 and L3.
6 IEC 60309 230V/400V, 16A plug to Schuko outlet adapter. Only L1, N and PE are wired up. The PE pin is connected to the Schuko earth clips.

 

IEC 60309 16A 4-pin plug IEC 60309 16A 4-pin socket made in Poland
IEC60309-Perilex adapter coird

7 IEC 60309 400V, 16A 4-pin three-phase plug. A connection without neutral pole can be used for three-phase electric motors, because a balanced load between L1, L2 and L3 is assured. For safety there is always a protective earth (PE) connection.
8 IEC 60309 380V, 16A 6h 4-pin three-phase socket made in Poland. Plug no. 7 fits in the Polish IEC socket. The indication of 6h refers to the position of the earth pin, which is at 6 o'clock (identical to socket nos. 1 and 4).
9 IEC 60309 230V/400V, 16A three-phase adapter cord for Perilex sockets.

 


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