What is UL 60947-3:2020?

UL 60947-3:2020 is an important international standard that establishes safety requirements for low-voltage switchgear and controlgear. This technical article aims to provide a thorough understanding of the UL 60947-3:2020 standard, its scope, key requirements, and the significance it holds in ensuring electrical equipment safety.

Scope of UL 60947-3:2020

The scope of UL 60947-3:2020 covers low-voltage switchgear and controlgear assemblies, primarily intended for use in a three-phase AC system with an operating voltage not exceeding 1,000 volts. It encompasses a wide range of applications, including industrial, commercial, and residential installations.

This standard applies to products such as circuit-breakers, contactors, motor starters, disconnect switches, and other similar devices used for protective purposes or control functions.

Key Requirements

UL 60947-3:2020 sets forth both general and product-specific requirements to ensure the safety and reliability of low-voltage switchgear and controlgear. Key requirements encompass aspects such as electrical insulation, mechanical construction, protection against electric shock, temperature rise, short-circuit withstand strength, and capability to carry current without excessive heating.

The standard specifies tests and performance criteria to evaluate these requirements, ensuring compliance with necessary safety standards. It also covers safety instructions, markings, and documentation that manufacturers must provide to users.

Significance of UL 60947-3:2020

The adoption and adherence to UL 60947-3:2020 are crucial to maintaining electrical safety within various industries. Compliance with this standard ensures that switchgear and controlgear meet essential safety criteria, reducing the risks of electrical accidents, fire hazards, and equipment failure.

By adhering to UL 60947-3:2020, manufacturers can demonstrate their commitment to producing safe and reliable products. End-users can have confidence in the performance and quality of these electrical devices.

Beyond safety considerations, compliance with this standard also promotes international harmonization of requirements, enabling smooth trade and interchangeability of switchgear and controlgear assemblies across different regions and markets.