Technical Articles

What is IEC 61439-3 ?

IEC 61439-3 is an international standard for charging electric vehicles (EVs) utilizing alternating current (AC). It specifies the requirements for both the vehicle inlet and the charging infrastructure plug. ensuring compatibility and safety during EV charging.

History and Development

The IEC 61439 standard was developed by the International Electrotechnical Commission (IEC) as a technical specification for low-voltage switchgear and controlgear assemblies. The standard was first published in 2018 and has since been updated several times to reflect the latest developments in the field.

Purpose of IEC 61439-3

The main purpose of IEC 61439-3 is to establish minimum requirements for low-voltage switchgear and controlgear assemblies. with the goal of ensuring the safety of personnel and property. as well as the reliable operation of electrical systems. By complying with this standard. manufacturers can design and produce high-quality equipment that meets specific performance criteria.

Key Features of IEC 61439-3

IEC 61439-3 includes several key features that help ensure safe and reliable operation. These features include:

* Differential signaling: IEC 61439-3 uses a differential signaling scheme. which helps to reduce interference and improve the reliability of the charging process.

* Compatibility with different charging technologies: IEC 61439-3 is designed to work with different charging technologies. including Level 1 (20 kW). Level 2 (40 kW). and DC Fast Charging.

* Safety features: IEC 61439-3 includes several safety features. such as overcurrent protection and overvoltage protection. to help prevent equipment damage and injury.

* Test procedures: IEC 61439-3 outlines a set of test procedures that manufacturers must follow to ensure their equipment meets the standard's requirements.

* Documentation: IEC 61439-3 requires manufacturers to provide detailed documentation. including a user manual and a technical specification. to help users understand and use their equipment.


IEC 61439-3 is an important international standard for EV charging equipment. By establishing minimum requirements for switchgear and controlgear assemblies. this standard helps ensure the safety and reliability of EV charging systems. With the latest updates and developments in the field. IEC 61439-3 continues to be a valuable resource for manufacturers and users alike.



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