Bussmann FNQ-R-20 Current-Limiting Time-Delay Fuse, 20 A, Ferrule End, 12 sec Response Time, 600 Vac

Description

Features

• Engineered with a dual-element time-delay mechanism that guarantees a minimum of 12 seconds of hold time at 200% of its rated current, the FNQ-R-20 effortlessly handles high-inrush currents and inductive surges. This high-performance thermal delay eliminates expensive nuisance tripping during the startup cycles of small control transformers and industrial motors, keeping your manufacturing lines running without interruption.
• Featuring a dedicated Class CC rejection tip, this 13/32-inch by 1-1/2-inch cartridge fuse fits securely into rejection-style fuse blocks and holders while strictly preventing the dangerous insertion of lower-rated supplementary fuses. This fail-safe mechanical footprint ensures your electrical panel remains code-compliant and safely configured, preventing maintenance personnel from accidentally compromising the downstream circuit's safety.
• Boasting an exceptional 200,000-amp RMS symmetrical interrupting capacity at 600Vac, this LimitronTM fuse complies fully with NEC Section 110.9 for large-capacity electrical systems. This massive breaking capacity ensures that even under severe short-circuit conditions, the fuse will safely isolate the fault, preventing catastrophic arc flash damage, panel explosions, and extensive equipment destruction.
• By providing up to 10 times better current limitation than standard supplementary fuses, the FNQ-R-20 rapidly chokes off destructive fault currents before they reach peak levels. This rapid clearing speed shields vulnerable control components, PLCs, and branch circuits from intense electro-magnetic and thermal stresses, drastically reducing component failure rates and long-term repair costs.

Documentation & Downloads

Specifications