The Bussmann FRN‑R‑60 is a heavy‑duty, dual‑element, time‑delay fuse designed for demanding industrial applications. As part of Bussmann’s Fusetron Class RK5 family, it provides advanced overload and short‑circuit protection, high interrupt ratings, and the ability to tolerate temporary inrush currents—making it ideal for motors, machinery, panelboards, and distribution systems.

Key Features

• Dual‑element time‑delay design, allowing temporary overloads such as motor starting surges without nuisance opening. 
• Time‑delay performance: minimum 10 seconds at 500% of rated current (for 35–60A range). 
• Current‑limiting Class RK5 construction, reducing let‑through energy during fault conditions.
• Provides protection against motor overloads, ground faults, and short circuits. 
• Improves selective coordination, preventing upstream devices from opening unnecessarily. 
• Available in non‑indicating or indicating versions 

Specifications

• Amp Rating: 60A 
• Voltage Rating:
  • 250 VAC
  • 125 VDC
• Interrupt Rating:
  • 20 kAIC at 125 VDC
  • 200 kAIC at 250 VAC
• Fuse Type: Dual‑element, time‑delay (slow‑blow) 
• Class: RK5 (UL 248‑12) 
• Body Style: Cartridge fuse with clip‑mount terminals
  • Diameter: 0.81 in
  • Length: 3 in
• Material: Fiberglass body construction for durability. 
• Indicator: Non‑indicating standard; indicating optional. 

Applications

The FRN‑R‑60 is widely used in industrial and commercial electrical systems, especially where cycles of inrush and overload occur:

• Motor control centers (MCCs) 
• Power panelboards 
• Combination motor starters
• Machinery disconnects 
• Circuits requiring time‑delay fuses to handle high startup currents (motors, transformers)