The BP/FRN‑R‑45 FUSETRON® Time‑Delay Cartridge Fuse from Bussmann Corporation is a high‑reliability overcurrent protection device engineered for demanding commercial and industrial electrical applications. Designed as part of the proven FUSETRON® FRN‑R series, this dual‑element Class RK5 fuse provides superior performance in circuits subject to temporary overloads and high inrush currents, such as motors, transformers, and inductive loads.

Rated at 45 amps and 250 volts AC, the BP/FRN‑R‑45 combines extended time‑delay capability with fast, current‑limiting short‑circuit protection. Its dual‑element construction uses separate components for overload and short‑circuit response, allowing brief surge currents to pass without opening the circuit while reacting quickly to damaging fault conditions. This design helps reduce nuisance fuse replacements, minimize downtime, and protect valuable electrical equipment.

The Class RK5 rejection‑type body enhances system safety by preventing the installation of lower‑rated substitute fuses when paired with compatible fuse holders. With a high interrupting rating, the BP/FRN‑R‑45 is well suited for use in power panelboards, motor control centers, and industrial machinery where dependable fault interruption is critical. This retail‑packaged version includes two fuses, making it convenient for maintenance, repairs, and stocked inventory.

Key Features

• Dual‑element, time‑delay design for combined overload and short‑circuit protection
• Withstands high inrush currents from motors and transformers without nuisance opening
• High current‑limiting performance reduces downstream equipment damage
• Class RK5 rejection‑type construction helps prevent improper fuse substitution
• Supports selective coordination within Class RK5 fuse systems
• Non‑indicating design for standard industrial and commercial applications
• Carded package includes two cartridge fuses

Specifications

• Manufacturer: Bussmann Corporation
• Product Series: FUSETRON® FRN‑R
• Model Number: BP/FRN‑R‑45
• Amperage Rating: 45 A
• Voltage Rating: 250 VAC (125 VDC)
• Fuse Class: Class RK5
• Fuse Type: Cartridge fuse, time‑delay
• Element Type: Dual‑element
• Interrupting Rating:
  • 200 kAIC at 250 VAC
  • 20 kAIC at 125 VDC
• Response Time: Minimum 10‑second time delay at 500% of rated current
• Indication: Non‑indicating
• Terminal Style: Ferrule end × ferrule end
• Physical Size: 13/16 in × 3 in (approximately 20.6 mm × 76.2 mm)
• Packaging: 2 fuses per card

Applications

• Motor branch circuits
• Motor control centers
• Combination starters
• Industrial machinery and equipment disconnects
• Power panelboards and distribution panels
• Commercial and industrial control panels