Overview
The Littelfuse FLSR100ID is a Class RK5 time delay fuse delivering reliable overcurrent and short-circuit protection for industrial and commercial electrical systems. This 100-ampere, 600VAC/300VDC dual-element fuse features visual blown fuse indication, reducing downtime and eliminating guesswork during maintenance. Class RK5 fuses are the most widely used class of fuses across general-purpose circuits, control panels, and motor-driven equipment.
Key Features
- Dual-Element Time Delay: Superior cycling characteristics reduce nuisance openings and extend fuse life in circuits with motor inrush currents.
- Visual Blown Fuse Indicator: Patented state-of-the-art indicator design provides at-a-glance blown fuse identification, eliminating the need to test suspect fuses.
- 200 kA AC / 20 kA DC Interrupting Rating: Meets ANSI/UL standards for both AC symmetrical and DC applications.
- Blade Terminal Construction: Knife-blade style terminals for secure fit in standard Class RK5 rejection fuse holders.
- UL Listed and CSA Certified: Complies with UL Standard 248-12 (File No. E81895) and CSA Certification (File No. LR29862); also listed under Federal Specification WF-1814.
Technical Specifications
- Ampere Rating: 100 A
- Voltage Rating: 600 VAC / 300 VDC
- Fuse Class: UL Class RK5 (Rejection)
- Type: Dual-Element Time Delay, Indicating
- Interrupting Rating (AC): 200,000 A RMS Symmetrical
- Interrupting Rating (DC): 20,000 A
- Terminal Type: Blade (Knife-Blade)
- Body Style: Cylindrical Cartridge
- Diameter: 1-5/16 inch
- Overall Length: 7-7/8 inch
- Weight: 0.41 lb
- Manufacturer Part Number: FLSR100ID
Typical Applications
The FLSR100ID is engineered for use in:
- Industrial control panels and distribution switchboards
- Service entrance and main feeder switches
- Motor-driven circuits and equipment requiring time-delay protection
- General-purpose distribution circuits in manufacturing facilities
- Commercial electrical systems requiring UL Class RK5 compliant overcurrent protection
Compatibility & Replacements
Compatible With
- Standard UL Class RK5 rejection fuse holders and clips
- Industrial control cabinets with 600VAC/300VDC rated disconnect switches
- Motor control centers (MCCs) and power distribution units rated for Class RK5 fuses
- Panelboards and switchboards designed for Class RK5 cartridge fuses
Replaces / Drop-In Replacement For
The FLSR100ID may replace earlier or non-indicating versions of 100A Class RK5 time delay fuses in the same voltage and interrupt rating class. Verify fuse holder and application compatibility before installation.
Works With
- ANSI/UL Standard 248-12 Class RK5 compliant electrical systems
- Federal Specification WF-1814 dual-element fuse applications
- MSHA-rated electrical equipment (FLSR_ID series)
- Littelfuse Powr-Gard indicator fuse family and components
