Overview
The Bussmann FNQ-R-5 is a Class CC time-delay, dual-element current-limiting fuse rated for 5A at 600VAC. Manufactured by Eaton’s Bussmann division, this fuse delivers advanced protection in a compact cylindrical package. Bussmann FNQ-R-5 fuses are designed for branch circuits, control circuit transformers, and critical industrial applications requiring specific current limitation and response characteristics. The FNQ-R series combines thermal overload protection with magnetic short-circuit protection in a single rejection-style cartridge.
Key Features
- Dual-element, current-limiting design limits damaging thermal and magnetic effects of short circuits
- Time-delay (slow-blow) characteristic allows inrush currents typical of transformers without nuisance trips
- 200kA interrupting rating at 600VAC provides superior protection capacity
- Rejection-style cartridge prevents insertion of lower-rated fuses into compatible fuse blocks
- Melamine tube with nickel-plated brass end caps ensure durability and reliable electrical contact
- UL Listed (Standard 248-4, Class CC), CSA Certified, and RoHS compliant for global applications
Technical Specifications
- Current Rating: 5A
- Voltage Rating: 600VAC
- Interrupting Rating (IR): 200kA RMS Symmetrical @ 600VAC
- Fuse Class: CC (miniature branch circuit)
- Blow Characteristic: Time-Delay / Slow-Blow
- Response Time: 12 seconds at 200% rated current
- Body Material: Melamine tube with nickel-plated brass ferrules
- Dimensions: 13/32″ Dia × 1-1/2″ L (10.3mm × 38.1mm)
- Mounting Style: Rejection cartridge (snap-in)
- Certifications: UL 248-4, CSA 1422-01/File 53787, RoHS Compliant
Typical Applications
- Control circuit transformer primary protection
- Branch circuit protection in industrial control panels and machinery
- Equipment with high inrush currents (e.g., motors, transformers)
- Commercial and industrial HVAC, lighting, and power distribution systems
- Safety and security system power supplies
Compatibility & Replacements
Compatible With
- Class CC fuse blocks and fuse holders rated for 600VAC
- Industrial control panels and equipment designed for Class CC fuses
- Power distribution systems requiring time-delay, current-limiting protection
- Eaton/Bussmann FNQ-R series compatible fuse blocks
Replaces / Drop-In Replacement For
- Earlier versions and alternative stock of Bussmann FNQ-R-5 fuses
- Direct equivalent to Limitron FNQ-R-5 (same manufacturer, branding variant)
- For Littelfuse KLD-R 5 and Mersen ATQR 5 substitutions, verify fuse block rejection compatibility before installation
Works With
- Standard Class CC cylindrical fuse blocks with 13/32″ × 1-1/2″ cartridge design
- Power distribution equipment from major OEMs (Eaton, Schneider, Siemens, ABB)
- Industrial control systems and PLCs requiring branch circuit overcurrent protection
