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M12 Connectors Have Many Faces

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M12 Connectors Have Many Faces
M12 Connectors Have Many Faces

Video: M12 Connectors Have Many Faces

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Video: M12 Connector Assembly Instructions 2023, February

The intelligence of the control cabinet is shifting more and more towards the field level - in the sense of decentralization. As a result, ever smaller and more compact device designs are required, which avoid large machine layouts. Another important aspect that contributes to minimizing the machine layout is the downsizing of the electrical drive technology. This means that connectors for the power supply must also have a compact size.

M12 is accepted worldwide

In the past, 7/8 inch or A-coded M12 connector systems were often used to supply power - for example from active I / O modules. Both connector types have advantages and disadvantages: The 7/8 inch version is a connector that is used worldwide and is used for currents up to 12 A. The nominal current per pin is a maximum of 9 A. However, the 7/8-inch connector, which is located in the middle price segment, has a large design and does not offer any shielded variants.

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The standard M12 variant is the most widely used connector internationally. Due to the compact design, it takes up little space on the device. In addition, the cost-effective M12 connector can be assembled in the field and easily installed on the machine. In addition, it offers a wide range of programs with shielded versions, T and Y distributors and sensor / actuator boxes. For this, the maximum cross-section is 0.75 mm² with a maximum current carrying capacity of 4 A per pin.

Based on the advantages of both connector systems, Phoenix Contact developed the first new plug faces in 2011 and launched them on the market. At the same time, international standardization was initiated.


Power connector as an interface between the battery and the scooter

Standardization of M12 Power according to IEC

In order to successfully develop and disseminate the M12 standard, constant assessment within the framework of international standardization was and is necessary. The IEC 61076-2-101 design standard for sensor / actuator connectors was created in the mid-1990s. The further development through new pole pictures and designs led to the fact that international standardization is also subject to constant expansion.

The IEC 61076-2-101 standard originally included all M8, M12 and M12 data technology connectors. Due to the increasingly extensive chapters, this standard has been divided into independent individual standards:

  • IEC 61076-2-101 for M12 connectors
  • IEC 61076-2-104 for M8 connectors
  • IEC 61076-2-105 for M5 connectors
  • IEC 61076-2-109 for M12 connectors for data transmission

The "M12 Power" category was added in 2011:

IEC 61076-2-111 for M12 connectors for power transmission

Codings for M12 Power

The encodings S and T developed by Phoenix Contact were first included in IEC-61076-2-111. The S coding is intended for AC applications. It has 4 contacts and 3 conductors + PE and enables a nominal voltage of 630 V and a current of 12 A. The S-coding is also available as a 2 + PE variant for 230 V and 16 A.

The T-coding was designed for DC applications, it also has 4 contacts. It can transmit a current of 12 A per pin with a maximum voltage of 63 V. Due to the market relevance and the demand for a 7/8-inch replacement, further encodings for 5 and 6-pin end users were developed in 2013 and included in the IEC-61076-2-111 standard.

Like the S-coding, the K-coding is intended for AC applications. It has 5 contacts: 4 conductors + PE. The nominal voltage is 630 V and according to the standard a current of 12 A can be transmitted.


M12 housing screw connection for two-part device ports

Connection technology

That was the tenth connector user congress

Content of the article:

  • Page 1: M12 connectors have many faces
  • Page 2: M12 mating face at the limit

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