What is UL 60947-5-7:2020

UL 60947-5-7:2020 is a professional technical standard that provides guidelines for the construction and testing of devices used in low-voltage switchgear and controlgear applications. This article aims to explain the key aspects and requirements of UL 60947-5-7:2020.

Scope and Application

The scope of UL 60947-5-7:2020 covers devices such as electromechanical contactors and motor-starters, electronic motor controllers, and solid-state contactors. These devices are widely used in various industrial and commercial applications for controlling motors, transformers, and other electrical loads.

UL 60947-5-7:2020 lays down the general requirements for these devices, including their construction, performance, mechanical endurance, and resistance to abnormal operation conditions like excessive temperature, short circuit, and overvoltage.

Key Requirements and Test Methods

One of the key requirements of UL 60947-5-7:2020 is the thermal test. Devices must be able to withstand specific temperature rise limits during normal and abnormal operating conditions. The standard provides detailed guidance on how to perform this test, including the duration and method of applying heat to the device.

In addition to the thermal test, UL 60947-5-7:2020 also sets requirements for electrical endurance, dielectric properties, mechanical strength, and resistance to ingress of foreign objects or moisture. These requirements ensure that the devices can operate safely and reliably under different environmental conditions.

Certification and Compliance

Manufacturers play a crucial role in ensuring compliance with UL 60947-5-7:2020. They must design and produce devices that meet the standard's requirements and undergo testing by accredited laboratories to obtain the UL certification mark. This mark is an indication that the devices comply with safety and performance standards.

It is important for users and specifiers of low-voltage switchgear and controlgear to select products that are certified to UL 60947-5-7:2020. By doing so, they can have confidence in the quality and reliability of the devices, thus ensuring the safety of their electrical installations.

In conclusion, UL 60947-5-7:2020 is a vital technical standard that ensures the safe and efficient operation of low-voltage switchgear and controlgear devices. Its comprehensive requirements and testing methods provide manufacturers, users, and specifiers with the necessary guidelines to ensure compliance and maintain the overall integrity of electrical systems and equipment.