Cooper Bussmann GMD-1-R Cartridge Time Delay Fuse 1A

Product Description

The COOPER BUSSMANN GMD-1-R is a glass-body cartridge time delay fuse rated at 1 amp, designed for overcurrent protection in low-amperage control circuits and electronic equipment. The time delay characteristic allows temporary inrush currents to pass without nuisance blowing, while still responding to sustained overload or short-circuit conditions. At 125 volts, it carries an interrupting rating of 10,000 amps, providing robust fault-current protection in its class. The compact midget form factor measures 20 mm in overall length and 5 mm in diameter. Electricians and electronics technicians install this fuse type in instrumentation panels, control boards, and small appliance circuits where precise overcurrent protection is required.

This fuse is suited for residential and light commercial applications involving low-current control circuits, instrumentation, and electronic equipment protection. The time delay design makes it appropriate for circuits with motors or transformers that draw brief inrush currents at startup. It fits standard 5 x 20 mm midget fuse holders common in panel-mount and PCB-mount configurations across a wide range of control and instrumentation equipment.

Key Features

• Time delay fuse action tolerates brief inrush current without nuisance blowing
• 1 amp rating for precise low-current circuit protection
• 10,000 amp interrupting rating at 125 volts for reliable fault protection
• 35 amp interrupting rating at 250 volts
• Glass cartridge body for visual inspection of fuse element condition
• Compact 5 x 20 mm midget form factor fits standard panel and PCB fuse holders
• Multiple certifications including UL Listed, CSA, RoHS, and PSE/JET

Compatibility

Designed as an OEM-style replacement for standard 5 x 20 mm glass cartridge time delay fuses in control circuits, instrumentation panels, and electronic equipment requiring a 1 amp time delay midget fuse.

Installation Notes

Installation should be performed by a qualified electrician or electronics technician in accordance with NEC guidelines. Always de-energize and verify the circuit is fully discharged before replacing any fuse. Confirm the replacement fuse matches the original amperage, voltage rating, and time delay classification before installation. Do not substitute a fast-acting fuse where a time delay type is specified, as this can result in nuisance trips or inadequate inrush tolerance.