Overview
The Bussmann FNQ-R-3/4 CC-Tron fuse is a time delayed, dual element current limiting fuse engineered for advanced circuit protection in control and industrial applications. This Class CC fuse features a 0.75 A rating, rejection style design, and 200kA interrupting rating at 600Vac. The dual-element, time-delay construction provides surge tolerance while maintaining fast response to sustained overloads, making it ideal for protecting sensitive equipment without nuisance trips.
Key Features
- Time-delay design compatible with the surge characteristics of small control transformers, providing good protection
- 200 kAIC interrupt rating with 12-second response at 200% overload
- Rejection-style cylindrical body measuring 13/32 in diameter × 1-1/2 in length, fitting standard Class CC fuse holders
- Superior performance for circuit and equipment protection needs; 600V branch circuit-rated IR fuse offering advanced protection in a small package
- UL, CSA, and CE certified with RoHS compliance
Technical Specifications
- Amperage: 0.75 A (3/4 Amp)
- Voltage Rating: 600 VAC
- Class: CC (current-limiting)
- Type: Time-Delay (dual-element)
- Interrupting Rating: 200 kA AC
- Body Diameter: 13/32 in (10.3 mm)
- Body Length: 1-1/2 in (38.1 mm)
- Terminal Type: Ferrule end
- Response Time at 200% Overload: 12 seconds
- Certifications: UL (Std. 248-4), CSA (Class 1422-01), CE, RoHS
- Manufacturer: Bussmann (Eaton)
Typical Applications
The FNQ-R-3/4 is suitable for current-limiting high inrush time-delay fuse applications including line protection, small control transformers, industrial control, and branch circuits. Common uses include:
- Control transformer primary and secondary protection
- Industrial motor control circuits and starter circuits
- HVAC system control circuits
- Automated manufacturing equipment electrical distribution
- Process control and instrumentation circuits
Compatibility & Replacements
Compatible With
- Standard Class CC fuse holders and blocks
- Rejection-style fuse socket systems (size-specific design prevents installation errors)
- Industrial control panels and electrical enclosures rated for Class CC fuses
- Control transformer primary/secondary circuits
Replaces / Drop-In Replacement For
- Existing Bussmann FNQ-R-3/4 installations
- Legacy Cooper Bussmann FNQ-R 0.75A fuses
- Any Class CC time-delay 0.75A fuse requiring 200kA interrupt rating and cylindrical (13/32″ × 1-1/2″) form factor
Works With
- Class CC fuse mounting hardware and rejection clips
- Control panel manufacturers’ standard electrical distribution designs
- Compatible with Littelfuse KLDR and Mersen ATQR as alternative current-limiting fuses
- All UL 248-4 and CSA Class 1422-01 compliant control circuit designs
