Cooper Bussmann FNA-1-1/8 Cartridge Time Delay Fuse

Product Description

The COOPER BUSSMANN FNA-1-1/8 is a cartridge-style, time delay fuse rated at 1.13 amps and 250 volts. It features a dual-element construction that tolerates brief inrush currents while still protecting circuits against sustained overloads and short circuits. The pin indicator design provides a visual indication of a blown condition, eliminating guesswork during troubleshooting. At 200 amps interrupting rating at 250 volts and 10 kA at 125 volts, it is suited for control circuit protection in HVAC equipment, small motors, and low-voltage panel applications. Licensed electricians and HVAC technicians are the primary installers.

This fuse is used in residential and light commercial applications where control circuit overcurrent protection is required. Typical installations include HVAC control boards, small motor branch circuits, and instrumentation panels that require a time delay characteristic to ride through motor startup inrush. The green color coding and indicating feature make it straightforward to identify the fuse condition without a meter during a service call. It mounts in a standard fuse holder sized for this cartridge body type.

Key Features

• Time delay dual-element design tolerates motor inrush without nuisance tripping
• Pin indicator provides visual blown-fuse indication for fast field diagnosis
• Rated 1.13 amps at 250 volts with 200 amp interrupting rating at 250 volts
• 10 kA interrupting rating at 125 volts
• Green color coded body for quick identification
• CE, CSA, and UL Listed for broad compliance across installation jurisdictions

Compatibility

Designed as an OEM-style replacement for cartridge time delay fuses used in standard fuse holders accommodating this body size and pin indicator configuration.

Installation Notes

Installation should be performed by a licensed electrician or qualified HVAC technician in accordance with the National Electrical Code (NEC). Always de-energize and lock out the circuit before removing or installing any fuse. Verify the replacement fuse amperage, voltage rating, and fuse type match the original equipment specifications before inserting into the fuse holder. Never substitute a higher-amperage fuse or bypass the fuse holder.