FRS-R-125 - 125 Amp Fuse

FRS-R-125 - 125 Amp Fuse

Meet the FRS‑R‑125 from Eaton Bussmann — a high‑performance, dual‑element Class RK5 time‑delay fuse rated at 125 amps, engineered for dependable overcurrent protection in demanding commercial and industrial power systems. With support for up to 600 VAC and 300 VDC, it’s built to guard motors, transformers, and branch circuits reliably against both overloads and short circuits. Its 10‑second delay at 500 % of rated current enables safe handling of motor inrushes and equipment startups without nuisance trips, making it an ideal choice when rugged performance and long device life matter.

Key Features and Benefits

• Time‑Delay Dual‑Element Design: Allows the fuse to withstand short bursts of inrush current (e.g., during motor startup) before opening, reducing unwanted trips and extending system uptime.
• High Interrupting Capacity: With a 200 kA interrupt rating at 600 VAC and 20 kA at 300 VDC, this fuse handles severe fault conditions without failing catastrophically.
• Current Limiting Action: Minimizes let‑through energy during fault events, protecting downstream equipment and reducing stress on your system.
• Blade‑End Connection: Designed for simple installation and replacement in compatible RK5 fuse blocks, helping reduce labor time and maintenance cost.
• Compact Form & Long Service Life: Engineered for extended dependability under industrial conditions.

Technical Specifications

• Amperage Rating: 125 A
  
• Voltage Rating: 600 VAC / 300 VDC
  
• Interrupting Rating: 200 kA at 600 VAC / 20 kA at 300 VDC
  
• Time Delay: Minimum 10 seconds at 500% of rated current
  
• Fuse Class: RK5
  
• Connection Type: Blade‑end × Blade‑end
  
• Approximate Dimensions & Weight: ~9.63 in length × ~1.6 in diameter, ~1.05 lb (for 125A version)
  

Material Compliance and Certifications

• Complies with UL 248‑12 and CSA C22.2 No. 248.12 standards for Class RK5 fuses.
• CE‑Marked, indicating compliance with applicable European directives.
• Dual‑element construction and current‑limiting design align with Eaton’s strategic emphasis on energy‑efficient protection.

Where It Works Best

• This Fuse is particularly well‑suited for applications where both reliable overload protection and robust short‑circuit response matter: motor control centers, combination starters, HVAC systems, lighting panels, and other industrial power distribution systems that experience high inrush currents or disruptive load events. Because of its time‑delay and current‑limiting features, you can often specify closer to full‑load amp values, optimize switchgear sizing, and reduce system cost.