The Bussmann NON‑40 fuse is a dependable, general‑purpose solution engineered for reliable overcurrent protection in a wide range of electrical installations. Built within the Bussmann NON Series, this fuse is designed for circuits that do not experience heavy motor loads or significant temporary inrush surges. Its non‑current‑limiting, one‑time design makes it an excellent choice for lighting, heating, residential, commercial, agricultural, and light‑industrial applications where classic, durable protection is needed.

Crafted with Bussmann’s trusted engineering standards, the NON‑40 delivers consistent performance and safety, offering a robust interrupt rating suitable for modern branch‑circuit protection requirements. With a cylindrical cartridge body and ferrule‑style terminals, it fits securely into standard fuse holders and maintains simple, tool‑free installation and replacement.

Key Features

• General‑purpose circuit protection ideal for lighting, heating, and branch circuits not subject to high inrush currents.
• One‑time, non‑current‑limiting design for predictable, dependable operation under overcurrent conditions.
• Fast‑acting fuse behavior, responding quickly to short‑circuit faults to help safeguard connected equipment.
• Durable cartridge construction with ferrule‑end terminations for secure mounting in standard fuse holders.
• Class H / K5 fuse classification, compatible with a wide range of legacy and modern electrical systems.
• Non‑indicating style, keeping the fuse simple, cost‑effective, and maintenance‑friendly.

Specifications

• Amperage Rating: 40 amps
• Voltage Rating:
  • 250 VAC
  • 125 VDC
• Interrupt Rating:
  • 50 kAIC at 250 VAC
  • 50 kAIC at 125 VDC
• Fuse Type: One‑time, non‑current‑limiting, medium/normal‑blow cartridge fuse
• Body Style: Cylindrical cartridge with ferrule x ferrule connections
• Dimensions:
  • Length: 3 in
  • Diameter: 0.81 in
• Class: H / K5
• Mounting: Holder‑based installation (clip-style terminals)
• Element: Single‑element fuse design
• Material: Melamine body for durability and thermal stability

Applications

The Bussmann NON‑40 is ideal for protecting electrical systems where overcurrent protection is essential but high‑surge tolerance is not required.

Perfect for:

• Lighting circuits, including residential and commercial installations
• Residential and agricultural fuse panels
• Heating equipment, small appliances, and resistive‑load circuits
• General branch‑circuit protection in commercial and industrial settings
• Low‑surge circuits where short‑circuit conditions must be interrupted quickly and safely