Cooper Bussmann MDA-20-R Cartridge Time Delay Fuse 20A

Product Description

The COOPER BUSSMANN MDA-20-R is a ceramic cartridge time delay fuse rated at 20 amps. It measures 1.25 inches in overall length and 0.25 inches in diameter, fitting the standard mini cartridge form factor. The time delay design allows brief inrush currents to pass without nuisance blowing, making it well suited for motor loads, transformers, and control circuits that draw startup current above the continuous rating. The MDA-20-R carries an interrupting rating of 10,000 amps at 125 volts and 1,500 amps at 250 volts. Licensed electricians and HVAC technicians are the primary installers. It meets UL, CSA, and MIL-STD-202 standards, confirming suitability for demanding commercial and light industrial panel and equipment applications.

The MDA-20-R is used in control panels, HVAC equipment, motors, and light industrial machinery where a compact 1/4-inch diameter cartridge fuse position is present. Its time delay characteristic suits applications with motors or transformers where momentary inrush current would open a fast-acting fuse unnecessarily. The ceramic body provides thermal stability under repeated overcurrent events. This fuse is sold in a minimum order quantity of 5 units, with each package containing 1 fuse.

Key Features

• 20-amp time delay rating handles motor inrush without nuisance blowing
• Ceramic body for thermal stability under repeated overcurrent stress
• Interrupting rating of 10,000 amps at 125 volts and 1,500 amps at 250 volts
• Mini cartridge form factor: 1.25 inches OAL, 0.25 inches diameter
• UL Listed, CSA Class 1422-01 Certified, and RoHS Compliant
• MIL-STD-202 Method 204 qualified for demanding environments

Compatibility

Designed as an OEM-style replacement for standard mini cartridge fuse holders accepting a 1/4-inch diameter by 1-1/4-inch time delay fuse in HVAC control boards, motor circuits, and light industrial control panels.

Installation Notes

Installation should be performed by a licensed electrician or qualified HVAC technician. De-energize and lockout the equipment before removing or replacing any fuse. Verify the replacement fuse matches the amperage, voltage, and time delay rating specified on the equipment nameplate. Do not substitute a fast-acting fuse in a time delay application, as this may cause nuisance opening on motor start.