The Bussmann NON‑50 fuse is a rugged, reliable solution engineered for dependable protection in light‑duty electrical circuits. Designed as part of Bussmann’s trusted NON Series, this fuse delivers proven performance in applications requiring basic, cost‑effective overcurrent protection without the need for time‑delay capability. Its one‑time, non‑current‑limiting design makes it an excellent fit for circuits free from heavy surge conditions, such as lighting, heating, and general industrial control panels.

Manufactured to meet Class K5/H standards, the NON‑50 fuse ensures solid fault‑clearing capabilities with a 50 kA interrupt rating, providing peace of mind in environments where short‑circuit currents remain manageable. Built with durable materials and ferrule end‑caps for secure mounting in fuse holders, it offers consistent performance and long‑lasting reliability backed by Bussmann’s industry‑leading engineering.

Key Features

• 50‑amp current rating for reliable circuit protection in light‑duty electrical systems.
• Rated for 250 VAC and 125 VDC, supporting both AC and DC circuits. 
• One‑time, non‑current‑limiting fuse design ideal for basic protection where temporary surges are not expected.
• Medium/Normal blow response ensures standard protection without time‑delay characteristics. 
• Class K5/H fuse classification, suitable for general‑purpose industrial and commercial use. 
• Non‑indicating style, keeping construction simple and cost‑effective. 
• Ferrule end‑cap construction for secure installation in compatible fuse holders. 
• 50 kA interrupting rating, ensuring safe clearing of overcurrent conditions. 

Specifications

• Model: NON‑50
• Series: NON
• Amperage Rating: 50A
• Voltage Rating:
  • 250 VAC
  • 125 VDC
• Interrupting Capacity: 50 kA at rated voltage. 
• Fuse Type: One‑time, Medium/Normal Blow. 
• Class: K5 / H. 
• Body Style: Cartridge fuse with ferrule ends. 
• Mounting Style: Clip‑style / holder required. 
• Indicator Style: Non‑indicating.
• Dimensions:
  • Diameter: 0.81 in
  • Length: 3 in
    (20.57 mm × 76.20 mm)
• Construction: Cylindrical melamine body
• Applications Category: General‑purpose protection for non‑surge circuits.
• Approvals: CE, UL, CSA 

Applications

The Bussmann NON‑50 fuse is engineered for circuits that do not experience high inrush currents and where full branch‑circuit protection is not required. Common uses include:

• Lighting circuits in commercial, industrial, and residential installations. 
• Heating circuits such as heaters, baseboards, and resistive load systems. 
• General-purpose branch circuits with stable load profiles and low available short‑circuit currents. 
• Control panels and industrial equipment requiring basic, non‑time‑delay overcurrent protection. 
• Legacy Class H/K5 fuse holders where a dependable replacement is needed.