What is UL 60947-4-3:2020?

UL 60947-4-3:2020 is a standard that specifies the requirements for devices used in places where overcurrent protective devices are required to be open on fault but closed under normal conditions. This standard applies to switches, disconnectors, and switch-disconnectors intended to be used in circuits with rated voltages up to 1000 V AC or 1500 V DC.

The Purpose of UL 60947-4-3:2020

The primary purpose of UL 60947-4-3:2020 is to ensure the safety and reliability of electrical devices used in various applications. It aims to establish common testing procedures and performance requirements for these devices to guarantee their proper functioning and compliance with international safety standards.

This standard also addresses specific product characteristics related to device behavior when exposed to overcurrents or short-circuit conditions. It defines the necessary tests and provides guidelines to evaluate the performance of these devices under different fault scenarios.

Key Features of UL 60947-4-3:2020

UL 60947-4-3:2020 outlines several key features and requirements for devices covered by this standard. These include:

Performance under overcurrent conditions: The devices must be capable of handling overcurrents without sustaining damage. They should not create additional hazards during overcurrent situations.

Functional requirements: The devices should operate reliably and consistently under normal operating conditions.

Temperature rise: The standard sets limits for the temperature rise of the device during normal operation to prevent overheating that could compromise its performance or safety.

Clearance and creepage distances: The standard defines the minimum distances necessary to ensure electrical safety, considering factors such as insulation, voltage, and environmental conditions.

Dielectric properties: Devices should have adequate insulation and dielectric strength to withstand specified test voltages without breakdown or excessive leakage current.

Mechanical stress: The devices should be able to withstand mechanical stress, such as vibration and shock, that may occur during operation or transportation.

Compliance and Certification

Manufacturers and suppliers of devices covered by UL 60947-4-3:2020 need to comply with this standard to ensure the safety and performance of their products. Compliance involves rigorous testing according to the specified procedures and meeting the requirements outlined in the standard.

Once a device passes all the tests and meets the performance criteria, it can be certified as UL 60947-4-3 compliant. This certification is an assurance that the device has undergone thorough evaluation and meets international safety standards, providing confidence to users and regulators.

In conclusion, UL 60947-4-3:2020 is a vital standard that ensures the safe and reliable operation of electrical devices in various applications. By establishing specific requirements and testing procedures, it promotes uniformity, safety, and performance consistency across the industry, ultimately protecting people and property from electrical hazards.