Bussmann FRS-R-1/4 Fusetron Class RK5 Time-Delay Fuse

Bussmann FRS-R-1/4 Fusetron Class RK5 Time-Delay Fuse

The Bussmann FRS-R-1/4 Fusetron is a dual-element, current-limiting time-delay fuse rated 250 mA at 600 Vac / 300 Vdc, built to Class RK5 specifications for reliable motor and branch-circuit protection. Its ferrule end x ferrule end connection style and non-indicating design suit combination starters, motor control centers, machinery disconnects, and power panelboards. With an interrupt rating of 200 kAIC at 600 Vac and 20 kAIC at 300 Vdc, this fuse delivers dependable current-limiting performance in demanding industrial electrical systems.

Key Features

• Amperage Rating: 250 mA for precise low-current protection in control circuits.
• Class RK5 Construction: dual-element, current-limiting time-delay design for motor and branch-circuit applications.
• Ferrule End Connection: ferrule end x ferrule end terminals for secure fuse holder mounting.
• Interrupt Rating: 200 kAIC at 600 Vac and 20 kAIC at 300 Vdc for high fault-current withstand.
• Response Time: 10s at 500% overload for reliable time-delay coordination.
• Dual-Element Design: two internal elements combine overload delay with short-circuit protection.
• Non-Indicating: standard non-indicating fuse body for combination starters and panelboard installations.

Technical Specifications

• Amperage Rating: 250 mA
• Application: Combination starters, motor control centers, machinery disconnects, power panelboards
• Class: Class RK5
• Connection: Ferrule end X ferrule end
• Fuse Indicator: Non Indicating
• Interrupt Rating: 200 kAIC at 600 Vac, 20 kAIC at 300 Vdc
• Number Of Elements: Dual
• Packaging Type: Standard
• Response Time: 10s at 500%
• Voltage Rating: 600 Vac, 300 Vdc
• Product Type: Current-limiting, time delay
• Product Length: .81 IN
• Product Details: Current-limiting, time delay
• Product Diameter: .81 IN
• Product Height: 5 IN
• Product Weight: .15 LB
• Product Width: .81 IN

Typical Applications

• Combination Starters
• Motor Control Centers
• Machinery Disconnects
• Power Panelboards

Why Bussmann?

Bussmann Fusetron fuses are engineered with dual-element, current-limiting construction for dependable overload and short-circuit protection in Class RK5 applications. Backed by a 200 kAIC interrupt rating at 600 Vac, the FRS-R Fusetron delivers the coordinated time-delay performance electrical professionals rely on for motor control and power distribution equipment. Choose Bussmann for consistent, code-compliant fuse protection built for demanding industrial environments.