Industrial ECSR100 Time Delay Fuse Dual Element RK5 600V

ECSR100 is a 100 A, 600 V dual-element, time-delay fuse in the RK5 class, designed for reliable protection of AC power distribution mains, feeders, and branch circuits that serve inductive loads such as motors and transformers or non-inductive loads like lighting and heating. This blade-terminal Edison-series fuse is current-limiting and sized for RK5 holders, measuring about 1.11 inches in diameter and 7.88 inches long to fit standard RK5 footprints. It carries UL and CSA safety approvals with CE listing, and is rated for 600 VAC operation with a symmetrical interrupting rating up to 200 kAIC, ensuring strong short-circuit protection while allowing momentary overloads to clear. The device features a defined time-delay performance, specified as a minimum delay of 10 seconds at 5x rated current, helping prevent nuisance openings during startup surges while protecting downstream equipment. As part of Eaton’s Edison ECSR family, it is available across a range of RK5 ratings (70–600 A) to match different protection requirements, and is commonly used in branch circuits, load centers, panel boards, AC drives, and similar protective applications where reliable overcurrent protection is essential.