Bussmann KTN-R-40 - RK1 Class Time-Delay Fuse 40A 250V (200kA AIC)

The Bussmann KTN-R-40 is a current-limiting, time-delay fuse from the LIMITRON family designed to provide reliable circuit protection in industrial electrical systems. It features a 40A current rating and 250V voltage rating with a high 200kA interrupting capacity at 250V for superior short-circuit protection. The fuse measures 3 inches in height with a 0.81-inch diameter cylindrical body and weighs 1.9 lb, constructed as a single-barrel RK1 class device that combines fast-acting short-circuit protection with time-delay characteristics for motor starting applications. This fuse meets industry standards for current-limiting performance and is commonly used in motor branch circuits, transformers, and industrial control panels where coordinated protection is essential.

Key Features & Specifications

• Type: Current-limiting time-delay fuse, single barrel construction
• Voltage Rating: 250V AC
• Current Rating: 40A
• Dimensions: 3" height × 0.81" diameter
• Standards: RK1 class rating
• Applications: Motor circuits, transformers, industrial control panels
• AIC rating: 200kA@250V
• Class Rating: RK1
• Barrels: 1
• Diameter: 0.81 inches
• Weight: 1.9 lb
• Family: LIMITRON
• Item Subcategory: Low Voltage Fuse

Product Identification

• UPC: 051712407090
• GTIN: 00051712407090