The two most common voltage ratings for low-voltage power distribution fuses are?

The two most common voltage ratings for low-voltage power distribution fuses are 250 volts and 600 volts. This is because these voltage ratings are standard in various electrical systems, especially in commercial and industrial applications where low-voltage distribution is prevalent.

Fuses rated at 250 volts are commonly used in systems that do not exceed this voltage, while those rated at 600 volts accommodate a wider range of applications, particularly in three-phase systems and higher-capacity circuits. These ratings ensure that fuses can effectively interrupt faults and provide adequate protection for electrical equipment and conductors in various configurations.

Thus, having fuses specifically rated at 250 volts or 600 volts aligns with safety standards and practices in electrical installations, making them the most common choices for low-voltage applications.