What is UL 60947-2:2020?

Introduction

The UL 60947-2:2020 standard, titled "Low-voltage switchgear and controlgear - Part 2: Circuit-breakers," is a widely recognized technical specification that sets forth the requirements for low-voltage circuit breakers used in various applications. This article aims to provide a thorough understanding of this important standard, its scope, key features, and benefits in the field of electrical engineering.

Scope and Coverage

UL 60947-2:2020 outlines specific criteria for circuit breakers with rated voltage not exceeding 1000 V AC (alternating current) or 1500 V DC (direct current). It covers a wide range of circuit breaker types, such as molded-case circuit breakers and air circuit breakers, used for the protection and switching of electrical installations in both industrial and commercial settings. The primary objective of this standard is to ensure the safety and reliability of these devices during their entire lifespan.

Key Features and Requirements

The UL 60947-2:2020 standard includes several essential features and requirements to guarantee the performance and functionality of low-voltage circuit breakers. These include:

Ensuring proper breaking capacity under normal and abnormal operating conditions.

Verifying the compatibility of circuit breakers with their respective switching devices and protective devices (such as fuses).

Defining appropriate temperature rise limits for efficient heat dissipation.

Evaluating the impact resistance, short-circuit resistance, and dielectric properties of circuit breakers.

Establishing guidelines for proper marking and documentation, aiding in product traceability and identification.

Benefits and Advantages

The adherence to UL 60947-2:2020 offers several advantages to manufacturers, installers, and end-users. Firstly, complying with this standard ensures the safety of electrical installations and protection against harmful incidents such as short circuits, overloads, or faults. Additionally, it provides a common set of requirements that enable interoperability between different brands and models of circuit breakers, promoting a competitive and diverse market.

Furthermore, utilizing UL 60947-2:2020 compliant circuit breakers improves energy efficiency due to their optimized construction and increased reliability, resulting in reduced downtime and maintenance costs. Lastly, adhering to recognized standards demonstrates a commitment to quality and adherence to industry best practices, enhancing trust and confidence among customers and regulatory bodies alike.