Bussmann FNM-40 Time-Delay Midget Fuse

Bussmann FNM-40 Time-Delay Midget Fuse, 40A, 250V, Ferrule End

The Bussmann FNM-40 is an Eaton Bussmann series FNM time-delay midget fuse rated 40A at 250V, engineered as a dual-element, non-indicating fuse with ferrule end x ferrule end terminations for standard midget fuse holders and fuse blocks. Its nickel-plated bronze endcaps provide corrosion resistance and consistent electrical contact in demanding commercial and industrial environments. As a standard-type FNM series fuse, the FNM-40 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 the FNM-40 to fit space-constrained panelboards, disconnect switches, and control panels while maintaining reliable circuit protection.

Key Features

• Amperage Rating: 40A for dependable overcurrent protection in electrical circuits.
• 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.

Technical Specifications

• Refer to manufacturer documentation for complete technical specifications.

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 series FNM time-delay midget fuse 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. The FNM-40's 40A, 250V rating, dual-element time-delay construction, and non-indicating standard design make it a dependable choice for electricians and facility maintenance professionals who need consistent, code-compliant overcurrent protection in compact panel and enclosure layouts.