What is UL 248?

UL 248 refers to the Underwriters Laboratories standard 248, which addresses requirements for fuses used in electrical power distribution systems. The purpose of this technical article is to provide a thorough understanding of UL 248 and its significance in ensuring safe and reliable operation of electrical systems.

The Importance of UL 248

UL 248 establishes performance, construction, and marking requirements for fuses intended for use in various applications, such as residential, commercial, and industrial settings. Compliance with these standards ensures that fuses are capable of protecting electrical circuits and equipment from overcurrents and faults, thereby reducing the risk of fires, electrical shock, and damage to property.

Key Requirements of UL 248

UL 248 sets forth specific guidelines for fuse performance characteristics, including current ratings, breaking capacity, time-delay features, and voltage ratings. These requirements help determine the suitability of a fuse for a particular circuit or application. Additionally, the standard also outlines construction and operational features that fuses must adhere to in order to meet safety and reliability standards.

Types of Fuses Covered by UL 248

UL 248 covers various types of fuses, including cartridge fuses, plug fuses, blade-type automotive fuses, ferrule-type fuses, and more. Each type has its own unique characteristics and applications. The standard provides specific requirements for each type, enabling manufacturers to design and produce fuses that meet the needs of different electrical systems and equipment.