Edison dual element time-delay class RK1 fuses are recommended for AC power distribution mains, feeders and branch circuits for motors and transformers, as well as non-inductive loads. RK1 time-delay fuses, in ratings from 225A to 600A at 250VAC (LENRK series) or 600VAC (LESRK series) maximum, offer superior current limitation, overload and cycling capabilities.
LENRK/LESRK series fuses have up to 40% more current limitation and up to 350% more Amps-Squared-Second (I2t) limitation under fault conditions than ECNR/ECSR series fuses, reducing the potential for damage. They also offer a better selection for electrical power system designers and superior short circuit protection for breakers having inadequate interrupting ratings. ECNR/ECSR and LENRK/LESRK fuse lines are physically interchangeable (and electrically interchangeable per U.L. equipment listing conditions). We recommend them as a practical, economical way to upgrade systems in many situations.
Current ratings up to 600 amps on RK1 current limiting fuses!
A Current-Limiting Fuse meets the following three conditions:
See our catalog to refer to the fuse selection guide, which includes a general summary of the specifications included for each fuse type.
This selection guide does not include the many variables that can exist for specific situations such as local codes, unusual temperature, or other operating conditions.
When selecting fuses, be sure to comply with any applicable PUBLIC SAFETY standards that apply to Overcurrent Protection Devices (OPD).