Bussmann FNM Series Time-Delay Midget Fuse

Bussmann FNM Series Time-Delay Midget Fuse

The Bussmann FNM Series is an Eaton Bussmann line of time-delay midget fuses rated 250V, available across a family of amperage ratings from 0.25 Amp through 40 Amp, including 0.25A, 0.8A, 1.125A, 1.4A, 3.5A, 4.5A, and 40A options. Each FNM fuse in this series is a dual-element, non-indicating fuse with ferrule end x ferrule end terminations for standard midget fuse holders and fuse blocks. Nickel-plated bronze endcaps provide corrosion resistance and consistent electrical contact in demanding commercial and industrial environments. As a standard-type FNM series fuse, this family is built for dependable overcurrent protection in branch circuit, motor, and control circuit applications where brief overload conditions—such as motor starting inrush—must be tolerated without nuisance opening. The compact midget form factor allows FNM Series fuses to fit space-constrained panelboards, disconnect switches, and control panels while maintaining reliable circuit protection across the full amperage range.

Key Features

• Amperage Rating Range: available from 0.25 Amp up to 40 Amp, allowing the correct fuse to be matched to the specific branch, motor, or control circuit load.
• Voltage Rating: 250V, suitable for standard low-voltage electrical distribution systems.
• Time-Delay, Dual-Element Design: accommodates temporary overload conditions such as motor starting inrush current without nuisance fuse opening.
• Ferrule End x Ferrule End Terminals: standard termination style for compatibility with midget fuse holders and fuse blocks.
• Nickel-Plated Bronze Endcaps: deliver corrosion resistance and consistent, stable electrical contact over time.
• Non-Indicating: standard construction without a visual blown-fuse indicator.
• Compact Midget Form Factor: sized to fit standard midget fuse holders, fuse blocks, and disconnect switches where panel space is limited.
• FNM Series, Standard Type: midget-body fuse form factor for compact panel and enclosure layouts, offered across a wide range of amperage options to cover multiple circuit protection needs.

Technical Specifications

• Series: FNM
• Amperage Rating: 0.25 Amp, 0.8 Amp, 1.125 Amp, 1.4 Amp, 3.5 Amp, 4.5 Amp, 40 Amp

Typical Applications

• Branch Circuit Overcurrent Protection
• Motor Circuit Protection Where Inrush Current Is Present
• Control Circuit Protection
• Commercial and Industrial Electrical Panels
• Panelboard and Load Center Fuse Applications

Why Bussmann?

Bussmann is a trusted name in circuit protection engineering, and the Eaton Bussmann FNM Series time-delay midget fuse family reflects that reputation with a dual-element design that balances sensitive overcurrent protection with tolerance for normal, temporary overloads. Nickel-plated bronze endcaps deliver long-term corrosion resistance and stable electrical contact, while the ferrule end x ferrule end termination style ensures compatibility with standard midget fuse mounting hardware across every amperage option in the series. With ratings spanning 0.25 Amp to 40 Amp at 250V, dual-element time-delay construction, and a non-indicating standard design, the FNM Series gives electricians and facility maintenance professionals a dependable, code-compliant option for overcurrent protection in compact panel and enclosure layouts.