What voltage does UL classify low-voltage fuses as operating at?

For low-voltage fuses, Underwriters Laboratories (UL) classifies their operational voltage limit as 600 volts or less. This classification is important because it establishes a standard for design and use in various electrical applications, ensuring safety and reliability in lower voltage systems. Low-voltage fuses are utilized in circuits where the voltage does not exceed this threshold, providing overcurrent protection in residential, commercial, and industrial installations.

The reason 600 volts specifically is chosen lies in the functional capabilities of low-voltage fuses to interrupt fault currents safely without posing significant hazards to users or equipment. This classification directly influences the manufacturing standards, testing procedures, and installation guidelines that comply with electrical codes and safety regulations. Understanding this voltage limitation helps electricians and engineers select the appropriate protective devices for ensuring system integrity and user safety.