Overview
The Bussmann FNM-1-4/10 is a time-delay midget fuse rated at 1.4A and 250V AC. Part of the FNM series, this supplemental fuse is engineered for circuits experiencing high inrush currents typical of motor and transformer loads. The melamine-tube construction with nickel-plated bronze ferrule endcaps delivers consistent performance in general-purpose, lighting, and meter protection applications. This box of 10 fuses ensures adequate inventory for maintenance and repair cycles.
Key Features
- Time-delay (slow-blow) design tolerates motor/transformer inrush without nuisance blowing
- 250V AC voltage rating with green color-coded body for easy identification
- Melamine tube construction provides durability in harsh electrical environments
- Ferrule-end X ferrule-end connection for standard fuse blocks and holders
- Dual-element design for enhanced circuit protection and selectivity
- Compact 13/32″ × 1-1/2″ form factor (5AG midget size)
Technical Specifications
- Current Rating: 1.4A
- Voltage Rating: 250V AC
- Series: FNM (Bussmann/Eaton)
- Class: Midget (Supplemental)
- Type: Time-Delay (Slow-Blow)
- Interrupt Rating: 100A at 250V AC; 10kA at 125V AC
- Body Material: Fiberglass/Melamine
- Endcaps: Nickel-plated bronze
- Dimensions: 13/32″ diameter × 1-1/2″ length (10.3 mm × 38.1 mm)
- End Connection: Ferrule × Ferrule
- Standards: UL-248-14, CSA Class 1422-01, CE
- Packaging: Box of 10 fuses
Typical Applications
- General-purpose circuit protection up to 250V AC
- Lighting circuits and meter protection
- Circuits with high inrush currents (motor-driven equipment, transformers)
- Supplemental protection for inductive loads
- Control circuits and auxiliary power distribution
Compatibility & Replacements
Compatible With
- Standard midget fuse blocks and holders rated for 1-1/2″ length, 13/32″ diameter
- Eaton Bussmann fuse blocks: BMM, CHM, BM, HEX, HEB, HPG, HPS series
- Mersen (Ferraz Shawmut) fuse holders compatible with 5AG format
- General industrial equipment and control panel applications up to 250V AC
Replaces / Drop-In Replacement For
- Littelfuse FLM-1-4/10 (direct equivalent)
- Mersen/Ferraz Shawmut TRM-1-4/10 (functionally equivalent)
- Older Bussmann part designations formerly marked as 5AB (where voltage/current match)
Works With
- Eaton Bussmann modular fuse block systems (1-, 2-, and 3-pole configurations)
- DIN-rail mounted fuse holders and switches
- Mechanical and electronic circuit protection coordination schemes
- Industrial automation and machinery control systems requiring supplemental fuse protection
