Overview
The Bussmann FNM-1 is a time-delay supplemental fuse designed to protect circuits with high inrush currents and inductive loads. Each fuse in this lot of 10 is rated 1A at 250V and features dual-element, current-limiting construction for reliable electrical protection in industrial and commercial applications.
Key Features
- Time-delay (slow-blow) operation — tolerates motor inrush and transformer startup transients without nuisance trips
- Dual-element, current-limiting design — Class CC/Supplemental fuse for enhanced overcurrent protection
- Melamine tube construction — durable fiber body with nickel-plated bronze endcaps for corrosion resistance
- Ferrule-end terminal — standard cylindrical cartridge form factor fits standard fuse holders
- UL and CSA listed — meets UL Std. 248-14 and CSA Class 1422-01; RoHS compliant
Technical Specifications
- Voltage rating: 250V AC
- Current rating: 1A
- Interrupting rating: 35A at 250V AC; 10 kA at 125V AC
- Fuse type: Dual-element, time-delay (slow-blow)
- Size: 10.3mm diameter × 38.1mm length (13/32″ × 1-1/2″)
- Terminal type: Ferrule end × ferrule end
- Class: CC (Supplemental)
- Series: Fusetron FNM
- Color code: Green
- Certifications: UL Listed (File E19180), CSA Certified (File 53787), CE marked, RoHS compliant
Typical Applications
- Motor control circuits and variable frequency drives
- Transformer primary and secondary circuits
- Inductive load protection (solenoids, relays, contactors)
- Industrial machinery and panel protection
- HVAC and pump motor circuits requiring soft-start tolerance
- Supplemental protection in multi-stage electrical systems
Compatibility & Replacements
Compatible With
- Standard midget fuse holders (ferrule-end style)
- Industrial control panels and switchboards
- Motor control centers (MCC)
- Disconnect switches and fusible disconnects
- Electrical equipment rated for Class CC supplemental fuses
Replaces / Drop-In Replacement For
- Other Bussmann FNM-1 time-delay fuses
- Littelfuse FLM-1 (verify specifications with application engineer)
- Verify compatibility with your system integrator before ordering
Works With
- Class CC/Supplemental fuse holders and fused equipment rated for 250V AC supplemental protection
- Circuits designed for UL Std. 248-14 supplemental fuses
- Equipment requiring time-delay fuse characteristics
