Cooper Bussmann MDQ-5 Time Delay Fuse 5A Glass Mini

Product Description

The COOPER BUSSMANN MDQ-5 is a glass-body cartridge time-delay fuse rated at 5 amps. It is designed to handle temporary overloads and inrush currents without nuisance tripping, making it suitable for motor and transformer protection circuits in HVAC, electrical, and control panel applications. The MDQ-5 measures 1.25 inches in overall length and 0.25 inches in diameter, fitting standard mini cartridge fuse holders. Licensed electricians and HVAC technicians install this fuse as part of low-voltage control circuits, equipment protection, and general electrical assemblies where time-delay characteristics are required.

The MDQ-5 is used in residential and commercial applications wherever a mini cartridge time-delay fuse is specified. Common install scenarios include HVAC control boards, small motor circuits, transformers, and industrial control panels where brief current surges must be tolerated without opening the circuit. Its compact glass body allows visual inspection of the element without removal, a practical advantage during field troubleshooting.

Key Features

• Time-delay design tolerates inrush and startup surges without nuisance trips
• Glass body allows visual fuse element inspection in the field
• 5-amp rating suitable for low-current motor and control circuits
• Compact mini cartridge form factor: 1.25 inches OAL, 0.25 inches diameter
• Dual-element construction for reliable time-delay performance
• Meets CSA Class 1422-01, UL Listed 248-14, and UL Listed Guide JDYX File E19180

Compatibility

Designed as an OEM-style replacement for mini cartridge time-delay fuse applications requiring a 5-amp, 1.25-inch by 0.25-inch glass cartridge fuse in standard mini fuse holders.

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 replacing a fuse. Confirm the replacement fuse matches the amperage and time-delay rating specified for the circuit. Never substitute a higher-amperage fuse or a fast-acting fuse where a time-delay type is required.