UL Class R fuses have a short circuit interrupting rating of up to what value?

UL Class R fuses are specifically designed for use in applications with high short-circuit current ratings. Their interrupting rating indicates the maximum fault current the fuse can safely interrupt without failing or causing dangerous conditions. The correct answer, which indicates that UL Class R fuses have a short-circuit interrupting rating of up to 200,000 amperes, is accurate based on established standards for these devices.

This high interrupting capacity makes Class R fuses particularly suitable for protecting circuits in commercial and industrial settings where substantial fault currents may occur. They are typically used in conjunction with equipment that may be subjected to high inrush currents or faults, ensuring that they can reliably interrupt excess current without risking damage to the electrical system or creating hazards. This capability is critical to maintaining safety and system integrity in electrical installations.