Bussmann FRN-R Series RK5 Time-Delay Fuse, 250V

Bussmann FRN-R Series RK5 Time-Delay Fuse, 250V

The Bussmann FRN-R Series is a line of 250V RK5 time-delay fuses engineered to deliver dependable overcurrent protection across motor circuits, control circuits, and general-purpose branch circuit applications. This product page covers the FRN-R Series in amperage ratings from 0.2A to 0.8A, giving electricians and maintenance teams a single source for selecting the correct low-amperage FRN-R fuse for a given circuit. Every fuse in this range shares the same 250V voltage rating and Class RK5, time-delay (TD) construction, allowing the fuse to ride through momentary inrush currents-such as those generated during motor starting or transformer energization-while still opening reliably under sustained overload or short-circuit conditions. This balance of surge tolerance and fast-acting fault protection makes the FRN-R Series a practical choice anywhere dependable, code-compliant circuit protection is required at lower current levels. Electrical professionals specify Bussmann fuses for their consistent, repeatable performance in commercial and industrial power distribution systems.

Key Features

• Voltage Rating: 250V across the entire FRN-R Series, making these fuses suitable for electrical systems and equipment operating at or below this voltage rating.
• Amperage Range: Available in ratings from 0.2A to 0.8A, allowing precise selection for low-current motor, control, and instrumentation circuits.
• Fuse Class: RK5 (Class RK5) construction, a widely used fuse classification designed for time-delay performance in circuits subject to temporary current surges.
• Time-Delay (TD) Operation: The time-delay design allows FRN-R Series fuses to withstand momentary inrush currents, such as motor starting loads, without nuisance opening, while still providing dependable protection against sustained overloads and short circuits.
• Model Designation: Identified as part of the Bussmann FRN-R family of RK5 time-delay fuses; select the specific amperage rating required for accurate circuit protection replacement.
• Consistent Manufacturing: Produced by Bussmann to help ensure uniform, repeatable time-delay characteristics from fuse to fuse across a given installation.
• Replacement Accuracy: The FRN-R designation helps electricians and maintenance teams specify an exact like-for-like replacement when servicing existing Bussmann FRN-R fuse installations at any amperage within this range.

Technical Specifications

• Series: RK5
• Amperage Rating: 8/10A (select amperage option for exact rating, 0.2A - 0.8A range)

Typical Applications

• Motor Circuit Overcurrent Protection
• Branch Circuit Protection
• Control Circuit Protection
• Industrial and Commercial Electrical Systems
• Panelboard and Disconnect Switch Fusing
• Maintenance Replacement for Existing Bussmann FRN-R Fuse Installations

Why Bussmann?

Bussmann is a widely recognized manufacturer of circuit protection products, and the FRN-R Series reflects that engineering focus with its 250V rating and RK5 time-delay construction across the full 0.2A to 0.8A range. Choosing a Bussmann FRN-R Series fuse helps ensure dependable, time-delay overcurrent protection for motor and branch circuit applications where inrush current tolerance and reliable fault clearing are both essential. For facilities and contractors standardizing on Bussmann circuit protection, the FRN-R Series offers a consistent, code-compliant option for maintaining and expanding RK5 time-delay fuse installations at any low-amperage rating.