Cooper Bussmann GMD-500-R 0.5A Time Delay Fuse

Product Description

The COOPER BUSSMANN GMD-500-R is a glass cartridge time delay fuse rated at 0.5 amps, designed for overcurrent protection in low-current electronic and control circuits. The time delay characteristic allows brief inrush currents to pass without nuisance tripping while still protecting downstream components from sustained overloads and short circuits. At 20 mm in overall length and 5 mm in diameter, this is a standard IEC mini fuse body size commonly found in HVAC control boards, instrumentation panels, and light commercial equipment. Licensed electricians and controls technicians are the typical installers for this component.

This fuse is suited for residential and light commercial applications where compact IEC-format fuse holders are specified. Typical installations include HVAC control circuit boards, low-voltage transformer secondary protection, electronic test instruments, and industrial control panels operating at 125 volts or 250 volts AC. The glass body allows visual inspection of the fuse element without removal, which speeds up diagnostic work in the field.

Key Features

• Time delay design tolerates inrush current without nuisance tripping
• Glass body enables visual fuse element inspection without removal
• 10,000 amp interrupting rating at 125 volts for robust short-circuit protection
• 35 amp interrupting rating at 250 volts
• IEC mini cartridge form factor: 20 mm overall length, 5 mm diameter
• Multi-standard certified including UL Listed, CSA, PSE/JET, and RoHS compliant

Compatibility

Designed as an OEM-style replacement for IEC 20 mm x 5 mm mini cartridge time delay fuse holders used in HVAC controls, instrumentation, and light commercial electrical panels.

Installation Notes

De-energize and lock out the circuit before replacing any fuse. Verify replacement fuse amperage and time delay rating match the original specification exactly — substituting a fast-acting fuse in a time delay application or oversizing the amperage rating can damage equipment or create a fire hazard. Use an insulated fuse puller when removing or inserting fuses in live-adjacent holders. Installation must comply with applicable NEC requirements for overcurrent protection and equipment labeling.