Overview
The Bussmann FRS-R-3 is a Fusetron dual-element, time-delay fuse rated at 3 amperes and 600 volts AC (300V DC). Part of the FRS-R Series, this Class RK5 fuse is engineered for energy-efficient protection in industrial and commercial applications. The cartridge-style design with ferrule terminals fits standard fuse blocks rated for Class RK5 rejection. This lot includes six fuses, offering backup stock for your facility’s electrical protection needs.
Key Features
- Dual-Element Time-Delay Design: Provides 10 seconds minimum of time-delay at 500% of rated current, reducing nuisance trips from motor inrush.
- Current-Limiting Protection: Restricts fault current to protect downstream components and equipment from high-energy short circuits.
- Class RK5 Rejection: Fits standard rejection-type fuse blocks; prevents accidental insertion of incompatible fuses.
- 200 kA Interrupt Rating: Handles fault currents up to 200,000 amperes at 600V AC (20 kA at 300V DC).
- UL/CSA Certified: Meets safety and performance standards for North American electrical systems.
Technical Specifications
- Current Rating: 3 Amperes
- Voltage Rating: 600V AC / 300V DC
- Fuse Class: RK5 (Rejection)
- Response Type: Time-Delay (Slow-Blow)
- Interrupt Rating: 200 kA @ 600V AC; 20 kA @ 300V DC
- Body Style: Cylindrical Cartridge
- Dimensions: 0.81 inch diameter × 5 inches length (20.6 mm × 127 mm)
- Terminal Type: Ferrule End × Ferrule End
- Weight (each): 0.14 lb (approx. 3.2 oz)
- Body Material: Fiberglass
- Certifications: UL, CSA, CE
- Renewable: Non-renewable (single-use)
- Quantity in Lot: 6 units
Typical Applications
The Bussmann FRS-R-3 is suitable for:
- Motor Protection: Provides coordinated protection for 3 HP or smaller motors without requiring external motor controllers.
- Feeder Circuits: Protects branch circuits and distribution panels in industrial facilities.
- Equipment Protection: Safeguards transformers, compressors, pumps, and similar machinery from overcurrent and short-circuit conditions.
- HVAC and Refrigeration: Used in air-handling units, heat pumps, and refrigeration systems operating at 600V.
- Manufacturing and OEM Applications: Standard choice for control panels and switchgear requiring reliable time-delay protection.
Compatibility & Replacements
Compatible With
- Standard Class RK5 rejection-type fuse blocks and holder sockets
- Industrial control panels rated for 600V AC service
- Motor starters and overload protection systems
- Electrical distribution equipment and switchgear
- Power systems with 50 or 60 Hz operation
Replaces / Drop-In Replacement For
- Littelfuse FLSR-3 (Class RK5, 3A, 600V)
- Mersen TRS-R-3 (Class RK5, 3A, 600V)
- Edison ECSR-3 (equivalent Class RK5 3A fuse)
Works With
- Fuse Block Types: 1BR, R600, and other standard Class RK5 rejection cartridge holders
- Electrical Standards: UL, CSA, and CE certifications ensure compatibility with North American and international electrical codes
- System Designs: Compatible with coordinated protective device systems using Class RK5 fuses for current limitation
