Cooper Bussmann GMD-250-R Cartridge Time Delay Fuse 0.25A

Product Description

The COOPER BUSSMANN GMD-250-R is a glass-body cartridge time delay fuse rated at 0.25 amps. It measures 20 mm (approximately 0.787 inches) in overall length and 5 mm (approximately 0.197 inches) in diameter, fitting the standard midget fuse footprint used across control panels, instrumentation, and low-voltage equipment. The time delay characteristic allows the fuse to absorb brief inrush currents without nuisance opening, while still protecting the circuit from sustained overloads or short-circuit faults. Licensed electricians and service technicians commonly install this fuse in industrial controls, HVAC equipment, and precision instrumentation where reliable overcurrent protection is required.

This fuse is suited for use in residential, commercial, and light industrial equipment that calls for a 5 x 20 mm time delay cartridge fuse. Typical applications include transformer secondary circuits, motor control boards, HVAC control panels, and electronic instrumentation requiring low-amperage protection. Its glass body allows visual confirmation of fuse condition without removal, reducing diagnostic time during troubleshooting. The 0.25 A rating makes it appropriate for sensitive low-draw circuits where precision protection is critical.

Key Features

• Time delay design absorbs inrush currents without nuisance tripping on motor or transformer starts
• Glass body enables visual inspection for quick fault diagnosis in the field
• Interrupting rating of 10,000 A at 125 volts and 35 A at 250 volts
• Meets UL, CSA, PSE/JET, and RoHS certifications for broad application compliance
• Standard 5 x 20 mm cartridge form factor fits widely available panel fuse holders
• Lightweight at approximately 0.01 pounds for easy handling and inventory

Compatibility

Designed as an OEM-style replacement for standard 5 x 20 mm time delay cartridge fuse positions in control panels, instrumentation enclosures, and HVAC equipment fuse holders rated for midget-style glass cartridge fuses.

Installation Notes

Installation should be performed by a qualified electrician or trained service technician. Always de-energize and lock out the circuit before replacing the fuse, following applicable NFPA 70 (NEC) lockout/tagout procedures. Verify the replacement fuse amperage, voltage rating, and time delay classification match the original equipment specification before inserting. Do not use a higher-amperage fuse as a substitute, as this will defeat the overcurrent protection intended by the original circuit design.