61439-003

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61439-003 is a standards document approved by the International Electrotechnical Commission (IEC). The document covers the construction of Low-voltage switchgear and controlgear assemblies. The document is designed to provide safety and reliability of such assemblies in accordance with the relevant national standards. The 2014 edition of the standard is applicable to the 2012 edition of the Low-voltage directive.

In short, 61439-003 specifies requirements and tests for the construction of low-voltage switchgear and controlgear assemblies. It applies to the following types of assemblies:

• Earthing switchgear assemblies
• Load-break switchgear assemblies
• Controlgear assemblies
• Safety switchgear assemblies
• Mixed switchgear and controlgear assemblies

The standards of 61439-003 are applicable to assemblies designed for a required voltage not exceeding 1000V a.c. or 1500V d.c. between any two conductors, and a rated voltage not exceeding 1000V a.c. or 1200V d.c. between any two conductors. 61439-003 applies to the use of these assemblies in residential, commercial, industrial and public installations.

The primary purposes of 61439-003 is to ensure that any assembly manufactured to its standard is able to operate safely and reliably regardless of the environment or application. To this end, the document specifies requirements and tests to be conducted on any assembly to determine whether it is suitable for its intended applications.

Some of the main requirements of 61439-003 are that the assembly must be suitable for its rated electrical and environmental conditions, and must have suitable characteristics for the intended use. The assembly must also be constructed from components of satisfactory quality and suitable dimensions. 61439-003 also specifies various tests that must be carried out on the assembly in order to verify its design and suitability.

One of the key tests specified by 61439-003 is the short circuit withstand test. This test involves subjecting the assembly to a short circuit of sufficient duration and amperage to test the performance of the assembly under these conditions. The test is designed to verify that the assembly is capable of withstanding the full short-circuit current without being damaged or failing to perform its intended functions. The test also verifies that the assembly is able to break the short-circuit current before a dangerous overvoltage is generated.

61439-003 also specifies an environmental test. This test involves subjecting the assembly to a range of environmental conditions such as temperature, humidity, temperature cycling, vibration and shock. The purpose of this test is to ensure that the assembly is able to withstand the ambient environmental conditions it is likely to encounter in service. It also verifies that the assembly is able to operate reliably in these conditions.

61439-003 is a comprehensive and detailed document that provides designers, manufacturers and users of low-voltage switchgear and controlgear assemblies with the requirements and tests for ensuring the safe operation of these devices. It is important to be aware of the requirements of 61439-003 and to ensure that any assembly is manufactured and tested in accordance with the requirements of the document.

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