Cooper Bussmann MDA-1/2-R Cartridge Time Delay Fuse 0.5A

Product Description

The COOPER BUSSMANN MDA-1/2-R is a mini cartridge time-delay fuse rated at 0.5 amps and 250 volts with a ceramic fuse body. It measures 1.25 inches in overall length and 0.25 inches in diameter, conforming to standard 1/4 x 1-1/4 inch miniature fuse dimensions. The time-delay characteristic allows brief inrush currents to pass without nuisance opening, while still protecting against sustained overloads and short-circuit conditions. Electricians and electronics technicians install this fuse in control circuits, instrumentation panels, small appliances, and low-current protective applications where precise overcurrent protection is required.

This fuse is suited for residential and light commercial control-circuit applications, including HVAC low-voltage control boards, electronic instrumentation, test equipment, and other panel-mounted fuse holders that accept 1/4 x 1-1/4 inch miniature fuse formats. Its time-delay behavior makes it appropriate for circuits with motor inrush or transformer magnetizing current that would otherwise trip a fast-acting fuse on startup. The ceramic body provides added mechanical durability and arc-suppression capability at the rated voltage.

Key Features

• Time-delay fusing accommodates brief inrush currents without nuisance tripping
• Ceramic body construction for enhanced arc suppression and mechanical durability
• 0.5A amp rating for low-current circuit protection
• 250V voltage rating suitable for standard control-circuit applications
• Mini cartridge form factor: 1.25 inches OAL x 0.25 inches diameter
• UL Listed, CSA Certified, and RoHS Compliant for broad installation acceptance

Compatibility

Designed as a direct-fit replacement for standard 1/4 x 1-1/4 inch miniature cartridge fuse holders accepting time-delay MDA-series fuses rated 0.5A 250V.

Installation Notes

Installation should be performed by a qualified electrician or trained technician. Always de-energize and lock out the circuit before removing or replacing a fuse. Confirm the replacement fuse matches the amp rating, voltage rating, and time-delay classification specified on the equipment nameplate or schematic. Do not substitute a higher-amperage or fast-acting fuse, as doing so may defeat the circuit protection and void equipment certifications.