Cooper Bussmann GMA-1-R Fast-acting Fuse 1A Glass Mini

Product Description

The COOPER BUSSMANN GMA-1-R is a glass cartridge fast-acting fuse rated at 1 amp, designed for overcurrent protection in low-current electronic and control circuits. The GMA-1-R measures 20 mm in overall length and 5 mm in diameter, conforming to the standard IEC 5x20 mm form factor widely used in control boards, instrumentation, and light commercial equipment. It carries an interrupting rating of 10,000 amps at 125 volts and 35 amps at 250 volts. The glass body allows visual inspection of the fuse element without requiring removal. Electricians, HVAC technicians, and electronics service professionals install this fuse as a direct replacement in panel-mount fuse holders, PCB holders, and chassis-mount blocks.

The GMA-1-R is suited for residential and light commercial applications wherever a 5x20 mm fast-acting fuse is required. Common installations include transformer secondary circuits, low-voltage control wiring, instrumentation panels, power supplies, and HVAC control boards that specify a 1 A fast-blow protective element. The fast-acting response characteristic provides immediate interruption on overcurrent events, protecting sensitive downstream components from sustained fault current.

Key Features

• 1 amp fast-acting response for immediate overcurrent interruption
• Standard IEC 5x20 mm cartridge form factor fits widely available panel-mount and PCB fuse holders
• Glass body enables visual element inspection without removal
• Interrupting rating: 10,000 amps at 125 volts and 35 amps at 250 volts
• UL Listed (Guide JDYX, File E19180) and CSA Certified (Class 1422-01, File 53787)
• RoHS 2002/95/EC compliant and meets UL/CSA 248-14 standard

Compatibility

Designed as an OEM-style replacement for any application requiring a 5x20 mm, 1 amp fast-acting cartridge fuse in a compatible panel-mount, chassis-mount, or PCB-style fuse holder.

Installation Notes

This fuse is installed by qualified electricians or HVAC technicians following applicable NEC requirements. Always de-energize and lock out the circuit before replacing a fuse. Confirm the replacement fuse amperage and voltage rating match the equipment nameplate or schematic before inserting. Never substitute a higher-amperage fuse or use a jumper in place of a properly rated fuse element.