Technological Innovation

What is BS EN 61439-3:2011?

BS EN 61439-3:2011 is a technical standard developed by the European Committee for Electrotechnical Standardization (CENELEC). It provides guidelines for the design, manufacture, and testing of low-voltage switchgear and controlgear assemblies. This standard applies to equipment used in electrical distribution systems up to 1000 volts AC or 1500 volts DC.

Why is BS EN 61439-3:2011 important?

BS EN 61439-3:2011 is crucial for ensuring the safety and reliability of switchgear and controlgear assemblies. It sets requirements for various aspects, including temperature rise limits, short-circuit withstand strength, and insulation coordination. Compliance with this standard ensures that these assemblies can perform their intended functions without causing harm to people or property.

Key features of BS EN 61439-3:2011

This technical standard defines several key features that need to be considered during the design, manufacturing, and testing processes of switchgear and controlgear assemblies. These features include:

Degree of protection: The standard specifies the minimum degree of protection against external influences, such as dust and water, based on the assembly's expected usage environment.

Clearances and creepage distances: The standard establishes requirements for clearances and creepage distances that ensure adequate insulation between conductive parts to minimize the risk of electrical breakdown.

Temperature rise limits: BS EN 61439-3:2011 defines maximum allowable temperature rises for different parts of the assembly under normal operating conditions. This helps prevent overheating, which can damage the equipment.

Testing procedures: The standard outlines various tests that need to be performed on switchgear and controlgear assemblies, such as temperature rise tests, dielectric tests, and short-circuit tests. These tests validate the performance and safety of the assemblies.


In summary, BS EN 61439-3:2011 is a crucial technical standard that ensures the safety, reliability, and performance of low-voltage switchgear and controlgear assemblies. By complying with this standard, manufacturers can provide high-quality products that meet the required safety standards and protect end-users from potential hazards.



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