The ECSR125 fuse is a 125 A, 600 V RK5-class time-delay, current-limiting fuse designed for feeder and branch protection in industrial power-distribution systems. This bullet-style fuse uses a cartridge body with Edison-style terminations and measures about 1.61 inches by 9.63 inches (40.9 mm by 244.6 mm), making it a compact option for panelboards and switchgear. It delivers up to 200 kAIC interrupt rating, balancing fast fault protection with tolerance for startup surges, and it is specified for 600 VAC operation as part of the RK5 time-delay family. Commonly applied in feeder/branch protection within panels and motor-control centers, the ECSR125 is stocked for applications requiring 125 A fusing in 600 VAC systems.
