Overview
The Bussmann FRS-R-5 is an industrial-grade 5A 600V time-delay fuse engineered for motor protection and branch circuit applications. The FRS-R-5 is an energy-efficient, dual-element, time-delay Class RK5 fuse that provides dual-element design with separate overload and short-circuit elements for equipment such as power panelboards, combination starters, motor control centers, machinery disconnects, and safety switches. This lot includes four fuses for inventory replenishment or circuit redundancy.
Key Features
- Dual-element, time-delay Class RK5 design
- Dual element fuses feature separate overload and short-circuit elements to provide the same short circuit protection as a fast acting fuse with the added benefit of letting inrush currents pass without opening the fuse
- Time-delay feature allows the initial startup current surge for typical motors to pass, opening in as little as 0.004 second during short-circuit conditions
- Ferrule end connections with 0.81 in diameter and 5 in overall length
- UL Listed Class R with 200 kA interrupt rating
- Compatible with Class H, Class K, or Class R fuse blocks via groove or notch design
Technical Specifications
Verify all specifications against your system requirements before installation.
- Amperage: 5 A
- Voltage Rating: 600 V AC / 300 V DC
- Fuse Type: Time-Delay, Dual-Element
- Class: RK5
- Interrupt Rating: 200 kA at 600 V AC; 20 kA at 300 V DC
- Connection Type: Ferrule End x Ferrule End
- Diameter: 0.81 inches
- Length: 5 inches
- Weight: 0.13 pounds
- Response Time: 10 seconds @ 500% current
Typical Applications
Heavy duty time-delay fuses used in motor protection that, when sized correctly, help protect motors from burnout caused by overloads or single-phasing, allowing the initial startup current surge to pass while opening prior to motor burnout when longer, dangerous overloads are present. Common uses include:
- AC motor branch circuits and starters
- Power distribution panels and combination starters
- Machinery disconnect switches
- Motor control centers
- Industrial equipment with inductive loads
Compatibility & Replacements
Compatible With
- Class H, Class K, or Class R fuse blocks
- 600 V AC electrical systems and switchboards
- Motor control circuits rated 300 V DC or 600 V AC
- Industrial panels and disconnect switches rated for RK5 fuses
Replaces / Drop-In Replacement For
Alternative designations include FRS-R 5 Amp, FRS-R 5A, Fusetron FRS-R-5, and Cooper Bussmann FRS-R-5. Verify compatibility with your system integrator before ordering to ensure proper fit and electrical specifications.
Works With
- UL Listed electrical systems and listed fuse holders
- CSA Certified motor control equipment
- Standard 600 V AC industrial distribution systems
- Motor protection relay schemes and thermal overload devices
