Littelfuse LLSRK-400ID - Low Voltage Fuse 400A (300kA@600V AC RK1 Time-Delay)

Littelfuse LLSRK-400ID is a low-voltage RK1-class fuse from the Powr-Gard family, designed for high-interrupting circuit protection in industrial power distribution systems. It features a 600V AC voltage rating and 400A current rating, with a 300kA interrupting capacity at 600V AC for reliable fault isolation. The fuse has a compact cylindrical design with a 2.59" diameter and clip-style connections, constructed as a single-barrel unit weighing 15 lb. It meets industry standards for RK1 fuses, providing time-delay characteristics to withstand temporary overloads while responding quickly to short circuits. Typical applications include motor control centers, switchgear, and industrial panelboards requiring durable circuit protection.

Key Features & Specifications

• Type: Low-voltage time-delay fuse (RK1 class)
• Voltage Rating: 600V AC
• Current Rating: 400A
• Dimensions: 2.59" diameter
• Standards: RK1 fuse classification
• Applications: Industrial power distribution, motor control centers, switchgear
• Connection: Clip
• Barrels: 1
• AIC rating: 300kA@600V AC
• Weight: 15 lb
• Class Rating: RK1