FNQ-R-30 BUSSMANN FUSE

FNQ-R-30 BUSSMANN FUSE

FNQ-R-30 BUSSMANN FUSE – Industrial 30A 600VAC Class CC Time-Delay Rejection Fuse

The FNQ-R-30 BUSSMANN FUSE (Model FNQ-R-30) is an industrial-grade, Class CC time-delay power fuse manufactured by Eaton’s Bussmann series. Engineered specifically to provide high-level protection for control transformers, inductive loads, solenoids, and industrial motor branch circuits, this 30-amp, 600 VAC LIMITRON™ current-limiting fuse offers superior overcurrent protection in a compact ferrule form factor.

Featuring an advanced dual-element, time-delay mechanism, the FNQ-R-30 BUSSMANN FUSE provides a minimum 12-second time-delay at 200% of its rated current. This allows high inrush startup currents from control transformers and fractional horsepower motors to pass without nuisance opening, while instantly interrupting high-energy short circuits up to 200 kA RMS Symmetrical at 600 VAC. Its Class CC rejection tip profile physically prevents the installation of non-rejection or lower-rated supplementary fuses, ensuring full compliance with National Electrical Code (NEC®) panel safety standards.

As shown in the image, the fuse features a durable melamine body housing printed with the distinct label reading “Bussmann LIMITRON™ CURRENT LIMITING TIME-DELAY CLASS CC FUSE FNQ-R-30 600Vac”, capped with nickel-plated brass end caps featuring the specialized Class CC rejection tip on the bottom.

Key Features of the FNQ-R-30 BUSSMANN FUSE

• Class CC Rejection Feature: Built with a specialized rejection tip on the end cap that keys into Class CC fuse blocks, preventing lower-rated supplementary fuses from being mistakenly installed.

• 12-Second Time-Delay Performance: Sustains a minimum 12-second time-delay at 200% current load, withstanding high transformer magnetizing inrushes and motor startup surges.

• High 200 kA Interrupting Rating: Fully rated to interrupt fault currents up to 200kA RMS Symmetrical at 600VAC, delivering maximum short-circuit current rating (SCCR) protection.

• Advanced Current Limitation: Drastically limits thermal and magnetic peak let-through current under fault conditions, shielding downstream contactors, switches, and relays.

• Compact Ferrule Profile: Industry-standard Class CC 13/32” x 1-1/2” (10.3mm x 38.1 mm) footprint saves valuable space inside crowded industrial control enclosures.

• Durable Melamine Body: High-grade melamine tube construction offers superior arc-quenching capability and physical integrity under extreme thermal stress.

Common Applications and Practical Usage

The time-delay characteristics and current-limiting performance of the FNQ-R-30 BUSSMANN FUSE make it the standard choice across industrial automation and HVAC panels:

• Control Transformer Primary Protection: Specifically designed to handle high magnetizing inrush surges on the primary side of control transformers without nuisance tripping.

• Motor Branch Circuit Protection: Provides compact overcurrent protection for small AC motors, pumps, fans, and motor starters in industrial machinery.

• HVAC & Refrigeration Controls: Protects contactor coils, solenoids, and compressor control circuits in commercial HVAC units.

• Industrial Control Cabinets: Integrates seamlessly into compact control panels requiring 600 V Class CC branch or supplementary protection.

Technical Specifications

The core electrical, physical, and compliance parameters for the FNQ-R-30 BUSSMANN FUSE are detailed below:

Operating Guidelines and Usage Tips

SAFETY NOTICE: Always isolate power sources and verify circuits are fully de-energized using a calibrated voltage tester prior to inspecting or replacing fuses.

• Holder Compatibility: Pair exclusively with dedicated UL Class CC rejection fuse holders or DIN-rail blocks (such as Bussmann CHCC or BC603 series) to ensure the rejection pin seats properly.

• Transformer Sizing: Follow NEC Article 450 rules when sizing for primary control transformer protection to ensure inrush current compliance while maintaining fast short-circuit response.

To review official Class CC current-limiting fuse specifications and industrial control protection standards, consult the National Electrical Manufacturers Association (NEMA) Directory.

To check regional warehouse inventory availability or request commercial quotes for volume electrical fuses, visit the Control Qatar Contact Page.