Cooper Bussmann FNQ-1/2 Cartridge Time Delay Fuse 0.5A

Product Description

The COOPER BUSSMANN FNQ-1/2 is a cartridge-style time delay fuse rated at 0.5 amps and 500 volts, with a 10 kA interrupting rating at AC. It is designed for general-purpose overcurrent protection in low-amperage branch circuits and control circuits. The fiber body construction measures 1.5 inches in length and 10.3 mm in diameter, fitting standard fuse holders used across residential, commercial, and light industrial electrical systems. Licensed electricians install this fuse to protect sensitive equipment and control wiring where nuisance tripping from inrush current is a concern. The time delay characteristic allows momentary overloads to pass without opening the circuit.

This fuse is suited for use in control panels, motor control circuits, and low-current branch circuits where a time delay response is required. The FNQ-1/2 mounts in a standard cartridge fuse holder and is applicable in HVAC control boards, industrial control equipment, and similar applications that draw low steady-state current but may see brief inrush spikes during startup. Its 500-volt rating makes it appropriate for both standard 120-volt and 480-volt control circuits commonly found in commercial mechanical systems.

Key Features

• 0.5 amp rating with time delay characteristic for inrush-tolerant overcurrent protection
• 500-volt AC rating suitable for a wide range of control circuit voltages
• 10 kA interrupting rating at AC for reliable fault clearing
• Fiber cartridge body measures 1.5 inches long and 10.3 mm in diameter
• Orange color coding for quick visual amperage identification
• CE Certified, CSA Certified, UL Listed 248-14, and RoHS Compliant

Compatibility

Designed for use in standard cartridge fuse holders accepting the FNQ series form factor. Suitable as a general-purpose time delay fuse replacement in control circuits, HVAC equipment, and motor control applications where a 0.5 amp, 500-volt cartridge fuse is specified.

Installation Notes

Installation and replacement of branch circuit and control circuit fuses should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. Always de-energize and lock out the circuit before removing or installing the fuse. Confirm the replacement fuse matches the amperage, voltage, and time delay rating specified for the circuit. Never substitute a higher-amperage fuse to address nuisance tripping.