Overview
The Bussmann FNQ-R-1/2 is a dual-element Class CC time-delay cartridge fuse designed for critical control circuit and industrial applications requiring current-limiting protection. Rated at 0.5A, 600VAC with a 200 kA interrupt rating, this fuse is engineered to protect downstream components against damaging thermal and magnetic effects of short-circuit currents while accommodating high inrush transients typical of control transformers.
Key Features
- Time-delay (slow-blow) action with minimum 12-second response at 200% rated current
- Advanced current-limiting technology protects against short-circuit damage
- Rejection-style design prevents insertion of incompatible fuse ratings
- Fiber body with melamine tube and nickel-plated brass endcaps for durability
- Compact cartridge format (0.41″ dia × 1.5″ length) fits standard Class CC fuse blocks
- UL Listed (Std. 248-4), CSA Certified, CE marked, and RoHS compliant
Technical Specifications
- Current Rating: 0.5 A (1/2 A)
- Voltage Rating: 600 VAC
- Interrupt Rating: 200 kA (RMS symmetrical)
- Class: Class CC (IEC equivalent: gG)
- Fuse Type: Time-delay, dual-element, current-limiting
- Body Material: Fiber with melamine tube; nickel-plated brass endcaps
- Dimensions: 10.3 mm × 38.1 mm (0.41″ Dia × 1.5″ L)
- Weight per Unit: 0.32 oz
- Time Delay Response: Minimum 12 seconds at 200% rated current
- Series: Limitron FNQ-R
Typical Applications
- Control circuit transformer protection
- Industrial branch circuits with high inrush current loads
- Automation and machinery control systems
- HVAC and refrigeration control circuits
- Small machine tool circuits
Compatibility & Replacements
Compatible With
- Class CC fuse blocks and holders (modular, DIN-rail, panel-mount, in-line)
- Eaton Bussmann BCM603, CHCC, HPS, HEY, and HEZ fuse holders
- NEC and UL-compliant control circuit protection schemes
- Industrial control systems and panel builds
Replaces / Drop-In Replacement For
- Bussmann Limitron FNQ-R-1/2
- Bussmann FNQ-R 0.5A
- Bussmann FNQ-R-0.5
- Bussmann CC-TRON FNQ-R-1/2
Works With
- Littelfuse KLDR Series (equivalent performance)
- Mersen ATQR Series (alternative supplier)
- All Class CC-rated fuse blocks and control panels
- NEC Article 430 (motor control) and Article 240 (overcurrent protection)
