Overview
The Littelfuse FLSR100 is a Class RK5 dual-element time-delay fuse engineered for robust overcurrent protection in industrial and commercial applications. FLSR100 series fuses offer excellent protection for all types of circuits, especially those containing motors, transformers, and other inductive loads prone to harmless starting and inrush currents. With knife-blade terminal construction and high current-limiting capability, this fuse prevents nuisance trips while maintaining rapid response to genuine faults.
Key Features
- Dual-Element Design: Time-delay characteristic tolerates motor start-up and transformer inrush currents without false operations.
- Class RK5 Rating: Rejection-style design prevents incorrect replacement and ensures product interchangeability within the class.
- High Interrupting Rating: 200kA at 600VAC and 20kA at 300VDC for superior protection in high-fault-current environments.
- Current-Limiting Construction: High-grade silica filler and advanced materials enable fast arc quenching and low peak let-through current.
- Fiberglass Body: Polyester cartridge provides dimensional stability and durability in harsh industrial conditions.
- UL and CSA Certified: Meets UL 248-12 and CSA C22.2 standards for North American installations.
Technical Specifications
The FLSR100 is engineered to meet demanding industrial protection requirements with precision manufacturing and quality materials.
Typical Applications
- Motor circuits and branch protection in industrial facilities
- Main and feeder circuits in distribution panelboards
- Transformer primary circuit protection
- Service entrance equipment and switchgear
- General-purpose industrial control panels
Compatibility & Replacements
Compatible With
- Class RK5 fuse holders and rejection-style clips
- Industrial control panels with 600V AC/300V DC rated protection
- Motor starter and contactor circuits
- Distribution equipment rated for RK5 fuses
Replaces / Drop-In Replacement For
- Littelfuse FLSR100 (direct equivalents with different catalog suffixes)
- Bussmann FRS-R 100 (verify compatibility with system integrator before ordering)
- Other Class RK5 100A time-delay fuses (verify interrupting rating matches your application)
Works With
- Class RK5 rejection-style fuse clips and holders
- Standard industrial electrical distribution panels and switchboards
- Motor control centers and industrial control cabinets
- Power distribution equipment rated for 600VAC/300VDC service
