Cooper Bussmann MDA-4-R Cartridge Time Delay Fuse 4A

Product Description

The COOPER BUSSMANN MDA-4-R is a ceramic cartridge time delay fuse rated at 4 amps and 250 volts. It belongs to the mini fuse class, measuring 1.25 inches in overall length and 0.25 inches in diameter. The time delay characteristic allows brief inrush currents to pass without nuisance tripping, making it well suited for circuits where motors, transformers, or capacitive loads draw elevated current on startup. Licensed electricians and electronics technicians install this fuse in control panels, instruments, and low-current branch circuits where compact fuse holders are specified.

The MDA-4-R is used in residential and light commercial electrical and HVAC control applications. Its compact mini cartridge form factor fits standard 1/4-inch by 1-1/4-inch fuse holders commonly found in control boards, test equipment, and industrial instruments. The ceramic fuse body provides mechanical durability and helps contain arc energy during an overcurrent event, making it appropriate for environments where vibration or high fault energy may be present.

Key Features

• Time delay action accommodates inrush currents and prevents nuisance tripping on motor and transformer loads
• Ceramic fuse body for arc containment and mechanical durability
• Compact mini cartridge size: 1.25 inches OAL x 0.25 inches diameter
• Rated 4 amps at 250 volts for reliable overcurrent protection
• UL Listed under Guide JDYX File E19180
• CSA Class 1422-01 Certified and MIL-STD-202 Method 204 RoHS Compliant

Compatibility

Designed as a direct-fit replacement for standard 1/4-inch by 1-1/4-inch mini cartridge fuse holders used in residential and commercial control boards, instruments, and electrical panels requiring a 4-amp time delay fuse.

Installation Notes

Installation should be performed by a qualified electrician or HVAC technician in accordance with the NEC and applicable local codes. Always de-energize and lock out the circuit before replacing any fuse. Verify the replacement fuse matches the original amperage, voltage, and time delay ratings before installing. Never substitute a higher-amperage fuse or bypass the fuse holder.