Overview
The Bussmann FRS-R-15 Fusetron Class RK5 time-delay fuse is a dual-element, current-limiting branch circuit fuse designed for industrial and commercial electrical protection. Rated at 15 amperes, 600Vac/300Vdc, this fuse delivers energy-efficient protection in motor control centers, combination starters, machinery disconnects, and power distribution panels. The dual-element construction and time-delay characteristics allow brief inrush currents while responding quickly to sustained overloads and short circuits.
Key Features
- Dual-Element Design: Time-delay construction tolerates motor inrush current without nuisance blowing
- High Interrupting Rating: 200,000A RMS symmetrical AC (200kA) provides reliable short-circuit protection
- Current-Limiting: Restricts fault current to safe levels, reducing equipment stress and improving system reliability
- Class RK5 UL Rating: Meets UL 248-12 and CSA standards for branch circuit and motor circuit protection
- Ferrule Terminal Ends: Standard rejection-type design prevents accidental incorrect insertion
Technical Specifications
- Amperage: 15A
- Voltage Rating: 600Vac / 300Vdc
- Fuse Class: RK5
- Series: FRS-R (Fusetron)
- Time-Delay Response: 10 seconds minimum at 500% rated current
- Interrupting Rating: 200,000A AC symmetrical / 20,000A DC
- End Type: Ferrule Terminal (both ends)
- Diameter: 0.81 inches
- Length: 5.0 inches
- Weight: 0.17 lb
- Certifications: UL 248-12, CSA C22.2 No. 248.12, CE
- Element Type: Dual Element
- Construction: Current-Limiting, Renewable
Typical Applications
- Three-phase motor protection in industrial machinery and pump systems
- Branch circuit protection in commercial panelboards and distribution centers
- Motor control center (MCC) feeder and branch protection
- Combination motor starters and machinery disconnects
- HVAC systems and large appliance circuits requiring time-delay overcurrent protection
Compatibility & Replacements
Compatible With
- Standard Class RK5 fuse blocks and holders (RM60030, RM60060 series recommended)
- All 600V AC electrical systems and 300V DC industrial circuits
- Motor control centers and combination motor starters rated for Class RK5 fuses
- Industrial panelboards and machinery disconnects with ferrule-type fuse clips
Replaces / Drop-In Replacement For
- Cooper Bussmann FRS-R-15
- All equivalent Class RK5 15A time-delay fuses with ferrule terminals
- Equivalent models from prior Bussmann product generations
Works With
- Eaton/Bussmann fuse blocks for 600V Class RK5 applications
- Any Class RK5 compliant electrical system meeting NEC and IEC standards
- Standard industrial control systems using branch circuit protection
