Overview
The Bussmann NOS-50 600V 50A fuse is a Class K5 general purpose cartridge designed for circuits not subject to temporary surges or high inrush currents. This non-current-limiting, one-time fuse provides basic protection for lighting, heating, and low-fault-current applications where available short-circuit currents are relatively low.
Key Features
- Class K5 Rating: General purpose, non-current-limiting fuse for standard industrial and commercial circuits
- One-Time Design: Non-renewable element; replaces instantly when blown
- Fast-Acting Response: Medium/normal blow speed suitable for circuits without transient surges
- 50kA Interrupt Rating: Rated at 600V AC—adequate for circuits with lower available fault currents
- Certifications: UL listed and CSA certified for reliable performance in controlled environments
- Compact Cartridge Form Factor: 1.06-inch diameter, fits standard non-rejection fuse blocks
Technical Specifications
- Voltage Rating: 600V AC
- Amperage: 50A
- Fuse Class: K5
- Interrupt Rating: 50kA at 600V AC
- Speed: Medium / Normal Blow (Fast-Acting)
- Body Material: Melamine
- Body Style: Cylindrical Cartridge
- Diameter: 1.06 inches (1-1/16 in)
- Overall Length: 5-1/2 inches
- Weight: 0.25 lb
- Element Type: Single, Non-Renewable
- Fuse Block Compatibility: Non-rejection style fuse holders
- UPC: 051712310505
Typical Applications
The NOS-50 is designed for use in electrical systems where short-circuit fault currents are relatively low and circuit loads are steady-state. Common applications include:
- Lighting circuits in buildings and industrial facilities
- Heating system protection
- General-purpose distribution panels rated for 600V
- Equipment circuits without large inrush currents or temporary surges
- Legacy electrical systems designed for K5 or H class fuses
Compatibility & Replacements
Compatible With
- Non-rejection fuse blocks rated for Class K5 or Class H fuses
- 600V AC distribution and branch circuits
- Standard electrical panels and switchgear designed for cartridge fuses
- Equipment fuse holders with 1.06-inch diameter cartridge openings
Replaces / Drop-In Replacement For
- Bussmann NOS-50 (exact equivalent)
- Other K5 Class 50A 600V fuses in non-critical applications (verify with system engineer before substitution)
Works With
- Bussmann fuse blocks and holders (Class K5 compatible models)
- Standard 600V AC distribution equipment
- Non-rejection fuse cartridge installations
