Overview
The Littelfuse NLS-100 is a Class K5, one-time general-purpose fuse rated for 100 amperes at 600VAC / 600VDC. This economical cartridge fuse is engineered for residential, commercial, and light industrial circuits where short-circuit current availability is less than 50,000 amperes. The NLS series replaces older Class H designs, offering superior interrupting capacity at a competitive price point.
Key Features
- Class K5 rating with 50,000A interrupting capacity (50kAIC)
- Blade-terminal design for easy insertion into standard fuse holders
- One-time (non-renewable) element for reliable operation
- Dual voltage rating: 600VAC and 600VDC capability
- UL listed for compliance with electrical safety standards
- Cost-effective protection for general-purpose feeder and branch circuits
Technical Specifications
- Current Rating: 100 Amperes
- Voltage Rating: 600VAC / 600VDC
- Fuse Class: Class K5
- Interrupting Capacity: 50,000A RMS Symmetrical (50kAIC)
- Terminal Type: Blade
- Physical Length: 7 7/8 inches
- Physical Diameter: 1 5/16 inches
- Operating Type: One-Time (Non-Renewable)
- Series: NLS
Typical Applications
The NLS-100 is ideal for protecting general-purpose residential and commercial circuits, including:
- Resistive heating loads and circuits with minimal motor load
- Branch circuits in panel boards and switchgear
- Feeder circuits where short-circuit availability is under 50,000 amperes
- Light industrial circuits requiring economical overcurrent protection
- Applications replacing legacy Class H fuses (10,000A rating)
Compatibility & Replacements
Compatible With
- Standard fuse holders and clips rated for Class K cartridge fuses
- Panel boards, switchgear, and distribution boards designed for 600VAC service
- Electrical systems with 50,000A or lower available short-circuit current
- Equipment rated for 600VAC / 600VDC dual-voltage fusing
Replaces / Drop-In Replacement For
- Class H fuses in equivalent 100A ratings (when upgrading from 10,000A to 50,000A interrupting capacity)
- Legacy NLS series fuses with similar voltage and current specifications
Works With
- UL-listed electrical equipment and distribution systems
- Standard North American fuse holder configurations
- Power distribution and branch circuit protection schemes
- Equipment meeting NFPA 70 (National Electrical Code) requirements
