Overview
The Bussmann FNM-20 is a time-delay supplemental cartridge fuse designed for circuits with high inrush currents and inductive loads. Rated for 20A at 250VAC, it features a 10kA interrupt rating and is UL and CSA certified. The FNM series delivers robust overload protection while accommodating the transient inrush currents typical of motor and transformer circuits.
Key Features
- Time-delay/slow-blow action: Tolerates motor start-up surges without nuisance trips while protecting against sustained overloads
- Melamine tube construction: Durable, compact design with nickel-plated endcaps for long service life
- Green color-coded: Clearly identifies 250VAC maximum voltage rating per industry standards
- Class CC midget fuse: Compact 13⁄32″ × 1-1⁄2″ form factor fits standard FNM fuse holders and blocks
- UL and CSA listed: Meets UL Standard 248-14 and CSA Class 1422-01 for industrial and commercial use
Technical Specifications
- Amperage: 20A
- Voltage rating: 250VAC
- Interrupt rating: 10kA at 125VAC; 35A at 250VAC
- Speed: Time delay (slow-blow)
- Class: CC (midget supplemental fuse)
- Body material: Melamine with nickel-plated endcaps
- Dimensions: 13⁄32″ (0.41″) × 1-1⁄2″ (38.1 mm)
- UPC: 051712522007
- Certifications: UL Listed Std. 248-14, CSA Certified Class 1422-01, RoHS compliant
Typical Applications
- Motor control circuits and motor starter protection
- Transformer secondary circuits and lighting loads
- HVAC equipment, pool pumps, and commercial heating systems
- Industrial control circuit protection
- Inductive circuit supplemental protection up to 250VAC
Compatibility & Replacements
Compatible With
- Bussmann BMM modular fuse blocks (1-, 2-, and 3-pole)
- FNM-series cartridge fuse holders with ferrule or clip termination
- Industrial motor control circuits and transformer protection circuits
- Any 250VAC supplemental fuse application requiring Class CC protection
Replaces / Drop-In Replacement For
- Bussmann BP/FNM-20 (identical specifications and function)
- Fusetron FNM-20 (equivalent alternative)
- Standard FNM-20 single units (this lot provides 10 units)
Works With
- Eaton Bussmann series supplemental fuse systems
- Standard FNM-compatible fuse blocks and meter sockets
- Industrial control panels and distribution boards rated 250VAC
- Motor control centers and HVAC equipment fusible protection circuits
