Overview
The Littelfuse FLNR-110 is a Class RK5 dual-element time-delay fuse designed for general-purpose electrical protection in industrial and commercial applications. With a 110A rating at 250V, this fuse combines fast short-circuit interruption with controlled time-delay response, making it ideal for circuits containing motors and other equipment sensitive to nuisance trips.
Key Features
- Dual-Element Design: Separate heating and magnetic elements provide independent control of overload and short-circuit protection
- Class RK5 Standard: Most widely used general-purpose fuse class for commercial and industrial applications
- Time-Delay Response: Allows temporary overcurrents (motor inrush) without false operation while providing instantaneous short-circuit protection
- Knife-Blade Terminal: Standard rejection-style blade terminal for secure, reliable connections
- 200,000 A.I.R. Rating: Reliable interruption capability for all overcurrents up to 200 kA AC symmetrical
- Precision Manufactured: Automated assembly ensures consistent, accurate response to faults
Technical Specifications
- Ampere Rating: 110A
- Voltage Rating: 250V AC / 125V DC
- Fuse Class: RK5
- Speed: Time-Delay (Slo-Blo)
- Element Design: Dual-Element
- Terminal Type: Knife-Blade (Rejection)
- Interrupting Rating AC: 200,000 A RMS Symmetrical
- Interrupting Rating DC: 20,000A
- Length: 7 1/8 inches
- Diameter: 1 19/32 inches
- Certifications: UL, CSA, cUL
- Series: FLNR
Typical Applications
The Littelfuse FLNR-110 is commonly used in:
- Industrial motor control circuits and variable-frequency drive (VFD) applications
- Service entrance protection and main distribution panels
- General-purpose branch circuits in manufacturing and processing facilities
- Equipment with inrush current requirements (transformers, motors, compressors)
- Control panel protection in automation and electrical distribution systems
Compatibility & Replacements
Compatible With
- Standard RK5 fuse holders and fuseholders with knife-blade terminals
- Industrial electrical panels and control enclosures
- Motor starter and soft-starter installations
- UL-listed power distribution equipment rated for Class RK5 fuses
- Equipment designed for 250V AC or 125V DC service
Replaces / Drop-In Replacement For
- Littelfuse FLNR-110 (earlier production runs)
- Other Class RK5 110A fuses with identical knife-blade terminal configuration
- Verify exact compatibility with your system integrator before ordering if replacing an alternative brand
Works With
- Standard North American 250V AC industrial electrical systems
- 125V DC control and instrument circuits
- All UL-listed RK5-rated equipment and control panels
- Motor protection devices and soft starters
