FRN-R-350 - 350Amp Fuse

FRN-R-350 - 350Amp Fuse

The FRN‑R‑350 time‑delay, dual‑element fuse from the well‑known Eaton Bussmann line delivers dependable protection for demanding commercial and industrial circuits. Rated for 350 amps at 250 VAC and 125 VDC, it’s designed to keep your motor loads, transformer feeds, and other high‑inrush applications running smoothly under pressure. Using current‑limiting technology, this fuse significantly reduces let‑through energy in the event of a fault, helping protect downstream equipment and minimize collateral damage. With its blade‑end × blade‑end design and Class RK5 rating, the FRN‑R‑350 is built for serious performance—and built to be trusted.

Key Features and Benefits

• Dual‑element time‑delay architecture: Offers overload protection and short‑circuit protection in one compact unit, simplifying design and inventory.
• Current‑limiting capability: Minimizes the peak let‑through energy (I²t) during fault conditions, helping preserve downstream equipment and reducing maintenance costs.
• High fault‑current capacity: With an interrupt rating of 200 kA at 250 VAC and 20 kA at 125 VDC, it’s ready for severe fault conditions.
• Non‑indicating design: Built for reliability when you don’t need a fuse that visually signals when it has blown.
• Class RK5 rating: A trusted standard in industrial circuit protection, giving you confidence that the component is up to the task.

Technical Specifications

• Catalog Number: FRN‑R‑350
• Amperage Rating: 350 A
• Voltage Rating: 250 VAC / 125 VDC
• Interrupting Rating:
  • 200 kA at 250 VAC
  • 20 kA at 125 VDC
• Response Time: Approximately 10 seconds at 500% overload
• Fuse Class: RK5
• Connection Type: Blade end × blade end
• Fuse Indicator: Non‑indicating
• Dimensions:
  • Length: 8.63” (219 mm)
  • Width: 2.38” (60.5 mm)
  • Height: 2.38” (60.5 mm)
• Weight: Approximately 1.95 lbs

Material Compliance and Certifications

• Industry Standards: This fuse meets or exceeds major industry standards, providing assurance for installation in North American and beyond code‑compliant systems.
• Certifications: It is CE‑marked for product safety and environmental compliance. It’s also UL 248‑12 compliant for fuse standards, tested to handle high fault currents with its Class RK5 rating.

Where It Works Best

• The FRN‑R‑350 is ideal for harsh environments where large fault currents and short‑duration overloads are common. Typical applications include motor control centers, HVAC systems, power distribution panels, and large machinery disconnects. If your facility demands both uptime reliability and maximum protection for downstream assets, this fuse is engineered for the job.