What is UL 60947-6-9:2020?

UL 60947-6-9:2020 is an international standard that specifically relates to circuit breakers and similar equipment used in low-voltage installations. It establishes requirements, test methods, and performance criteria for these devices, helping to ensure their safe and efficient operation.

Scope and Purpose

The purpose of UL 60947-6-9:2020 is to provide a consistent set of guidelines and standards for manufacturers, installers, and users of circuit breakers. The standard covers a wide range of equipment, including circuit breakers, residual current devices (RCDs), miniature circuit breakers (MCBs), molded-case circuit breakers (MCCBs), and others.

UL 60947-6-9:2020 applies to equipment used in both residential and industrial settings, covering various applications such as power distribution, motor control, and energy management systems. By adhering to this standard, manufacturers can ensure that their products meet certain safety and performance requirements, while installers and users can have confidence in the reliability and effectiveness of the equipment.

Main Requirements

UL 60947-6-9:2020 sets out numerous requirements that circuit breakers must comply with. These include electrical and mechanical characteristics, endurance testing, temperature rise limits, dielectric properties, and resistance to heat and moisture. The standard also provides guidelines for proper installation, operation, and maintenance of the equipment.

One of the key elements of UL 60947-6-9:2020 is the requirement for short-circuit withstand capability. Circuit breakers must be able to safely handle and interrupt fault currents to protect personnel and equipment from potential hazards. This involves rigorous testing procedures to ensure that the devices can withstand the forces generated during such events.

Compliance and Certification

In order to demonstrate compliance with UL 60947-6-9:2020, manufacturers may undergo testing and evaluation by independent certification bodies. These organizations assess products against the requirements of the standard and, if successful, issue certificates or marks of conformity. This certification process provides assurance to users that the equipment meets the necessary safety and performance criteria.

It is important for installers and users of circuit breakers to verify whether the products they are purchasing or specifying comply with UL 60947-6-9:2020. By using certified equipment, they can mitigate risks associated with electrical faults and ensure the ongoing reliability and safety of their installations.

In conclusion, UL 60947-6-9:2020 plays a crucial role in ensuring the safety and performance of circuit breakers used in low-voltage installations. By following its guidelines and standards, manufacturers, installers, and users can work together to create electrical systems that are both efficient and secure.