FRN-R-250 - 250Amp Fuse

FRN-R-250 - 250Amp Fuse

The FRN‑R‑250 from the trusted Bussmann by Eaton family is a high‑capacity 250 amp, dual‑element, time‑delay fuse engineered for heavy‑duty electrical systems. With current‑limiting performance and a 250 V AC / 125 V DC rating, this Class RK5 fuse delivers dependable protection for industrial power distribution, large motor circuits, and transformer feeds. Its blade‑end mounting makes installation fast and secure, and its design helps reduce let‑through energy during fault conditions, minimizing stress on downstream equipment and improving system reliability.

Key Features and Benefits

• Dual‑element time‑delay design: accommodates motor start‑up and temporary overloads without nuisance blowing, while still protecting against sustained overcurrent.
• Current‑limiting technology: limits the energy that passes through during a fault, reducing damage to connected equipment and improving system safety.
• Blade‑end mounting: ensures a secure, tool‑free fit into compatible RK5 fuse holders, simplifying replacement and maintenance.
• Proven legacy: part of the Bussmann/Eaton Class RK5 family, trusted in large‑scale commercial and industrial installations.
• Selective coordination friendly: streamlines selective protection strategy, helping isolate faults and maintain uptime.

Technical Specifications

• Amperage rating: 250 A
• Voltage rating: 250 VAC / 125 VDC
• Interrupting rating: 200 kA (RMS Sym) @ 250 VAC; 20 kA @ 125 VDC
• Response: Minimum 10-second time delay at 500% of rated current
• Connection type: Blade‑end x blade‑end (for tool‑free mounting)
• Approximate weight: 0.896 lb
• Body size: Typical lengths and dimensions per datasheet for 225‑600 A range; consult the manufacturer's spec sheet for full dimensions.

Material Compliance and Certifications

• UL Listed to UL 248‑12 standard, Class RK5.
• CSA Certified to C22.2 No. 248.12.
• CE marked for compliance with relevant European directives.
• Current‑limiting design meets rigorous industrial performance benchmarks for both overload and short‑circuit protection.

Where It Works Best

• This fuse is ideal for large motors, switchgear, industrial HVAC systems, and power distribution panels where high‑capacity overload protection is critical. If you’re managing a commercial or industrial facility with significant inrush currents or heavy‑duty motor loads, the FRN‑R‑250 is a strong fit. It helps ensure reliable operation, limits downstream damage in fault events, and supports maintenance‑friendly installations.