Technical Articles

What is UL 60947-3:2020

UL 60947-3:2020 is a technical standard that provides safety guidelines for low-voltage switchgear and controlgear equipment. It covers various electrical devices such as circuit-breakers, contactors, and motor-starters.

Scope of UL 60947-3:2020

The scope of UL 60947-3:2020 is to ensure the safety of individuals and property by establishing general requirements for low-voltage switchgear and controlgear. It applies to both individual components and complete assemblies used within electrical systems, where the rated voltage does not exceed 1000V AC or 1500V DC.

Key Requirements of UL 60947-3:2020

UL 60947-3:2020 specifies various requirements related to safety, performance, and testing of low-voltage switchgear and controlgear. Some key requirements include:

Breaking capacity: The equipment should be able to safely interrupt currents under normal and fault conditions without causing hazards.

Pollution degree: The level of pollution in the area, such as dust and humidity, should be considered when selecting equipment to ensure reliable operation.

Clearances and creepage distances: These requirements help prevent electrical arcing and provide insulation between conductive parts.

Protection against electric shock: Adequate measures must be in place to prevent contact with live parts and protect against electric shock.

Temperature rise: The equipment should not generate excessive heat during normal operation to avoid damage and fire hazards.

Mechanical strength: The mechanical design and construction of the equipment should withstand regular use and environmental conditions without failure.

Compliance and Certification

In order to comply with UL 60947-3:2020, manufacturers need to ensure that their switchgear and controlgear equipment meet all the relevant requirements specified in the standard. Compliance can be demonstrated through testing by accredited laboratories.

Once compliance is confirmed, manufacturers can obtain certification marks from recognized certification bodies. These marks indicate that the equipment meets the necessary safety standards and can be safely installed and used.



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