Overview
The Littelfuse FLSR-20 is a Class RK5 cartridge-style fuse rated for 20 amperes at 600V AC (300V DC). The dual-element design provides advanced short circuit and overload protection. Littelfuse FLSR series fuses provide excellent protection for all types of circuits especially those containing motors. This time-delay (slow-blow) fuse is engineered for reliability in switchboards, transformers, service entrance switches, and motor-branch circuits.
Key Features
- Class RK5 Fuse with an Ampere Rating of 20 and Cartridge-Style Construction
- Dual-element design provides advanced short circuit and overload protection
- Time-Delay (Slow-Blow) response for motor inrush current tolerance
- 600 VAC, 300 VDC voltage rating
- Current-limiting technology
- UL, CSA, and QPL approvals
Technical Specifications
- Ampere Rating: 20A
- Voltage Rating: 600 VAC, 300 VDC
- Fuse Class: RK5
- Type: Time-Delay (Slow-Blow)
- Construction: Dual-Element Cartridge
- Interrupt Rating: 200 kA at 600 VAC, 20 kA at 300 VDC
- Dimensions: 0.811″ Dia x 5″ L (20.6 x 127 mm)
- Weight: 3.2 oz
Typical Applications
The Littelfuse FLSR-20 is suited for:
- Motor branch circuits and feeder protection
- Service entrance switches
- Transformer protection
- Switchboard circuits
- Industrial control panels and distribution equipment
- Any general-purpose circuit requiring time-delay fusing
Compatibility & Replacements
Compatible With
- Any equipment rated for Class RK5, 20A fuses at 600V AC
- Motor control centers (MCCs)
- Panelboards and switchboards rated 600V
- Service entrance switches
- Industrial control systems requiring time-delay fusing
Replaces / Drop-In Replacement For
- FLSR020, FLSR 20 Amp, FLSR-20, FLSR20, FLSR 20A, FLSR-020, FLSR20A, FLSR020.T
- Any Class RK5 20A 600V fuse meeting UL, CSA, and QPL standards
Works With
- UL-listed and CSA-certified electrical distribution systems
- Equipment designed for standard Class RK5 fuses
- 480V and 600V industrial power systems
- Standard fuse holders and clips rated for cartridge fuses
