Bussmann FRN-R-1/4 Class RK5 Time-Delay Fuse

Bussmann FRN-R-1/4 Class RK5 Time-Delay Fuse, 250V

The Bussmann FRN-R-1/4 is a Class RK5 time-delay (TD) fuse rated for 250V circuits, engineered to deliver dependable overcurrent protection in low-current electrical applications. As part of the Bussmann Fusetron FRN-R series, this fuse combines a 250V voltage rating with Class RK5 construction and a time-delay design that helps prevent nuisance opening during temporary current surges. The FRN-R-1/4 designation reflects a 1/4 Amp rating, making it well suited for control circuits, instrumentation, and other low-amperage protection points where dependable, code-compliant fuse performance is required. As a Bussmann Fusetron fuse, the FRN-R-1/4 is commonly specified as a direct replacement in facilities standardized on Class RK5, time-delay fuse protection, and Bussmann fuses are widely used across commercial, industrial, and OEM electrical systems where consistent, code-compliant overcurrent protection is essential.

Key Features

• Voltage Rating: 250V rating supports standard low-voltage circuit protection applications.
• Fuse Class: Class RK5 construction for compatibility with RK5-rated fuse blocks, holders, and disconnect switches.
• Time-Delay (TD) Design: Time-delay characteristic allows the fuse to ride through brief current surges, such as motor or transformer inrush, without unnecessary opening.
• Amp Rating: 1/4 Amp rating, identified by the FRN-R-1/4 model designation, suited for low-current circuit protection.
• Fusetron FRN-R Series: Part of the Bussmann Fusetron FRN-R fuse family, a recognized dual-element time-delay fuse line used across commercial and industrial electrical systems.
• Dual-Element Construction: As a Fusetron-series fuse, the FRN-R-1/4 uses a dual-element design that separates overload sensing from short-circuit response for well-rounded circuit protection.
• RK5 Rejection Fit: Class RK5 sizing allows the fuse to seat properly in RK5 rejection-style fuse blocks and holders, supporting correct fuse coordination.
• Compact Fuse Format: The FRN-R-1/4 fits standard Class RK5 fuse holders, simplifying fuse selection and stocking for maintenance teams standardized on the RK5 class.

Technical Specifications

• Refer to manufacturer documentation for complete technical specifications.

Typical Applications

• Control Circuit and Instrumentation Protection
• Motor Starter and Control Transformer Circuits
• Low-Current Branch Circuit Protection
• Panelboard and Equipment Overcurrent Protection
• Replacement Fuse for Class RK5 Fuse Holders and Reducers
• Commercial and Industrial Electrical Maintenance

Why Bussmann?

Bussmann is a trusted name in circuit protection, and the FRN-R-1/4 Class RK5 time-delay fuse reflects that reputation with a 250V rating and time-delay performance designed for dependable, code-compliant operation. For electricians and facility teams who need overcurrent protection that stands up to real-world motor and control-circuit demands, the Bussmann FRN-R-1/4 delivers consistent performance backed by Class RK5 construction and dual-element Fusetron design. With a Bussmann fuse in place, facilities gain a recognized level of manufacturing quality and consistent fit within Class RK5-rated equipment. Choose Bussmann for electrical protection components built to keep circuits, equipment, and personnel safe.