Merit Brass A2D20R Time-delay Fuse 20A 250V RK1

Product Description

The MERIT BRASS A2D20R is a Class RK1 time-delay fuse rated at 20 amps and 250 volts. It is designed for overcurrent protection in electrical distribution systems where temporary inrush currents from motors or transformers must be tolerated without nuisance tripping. The time-delay characteristic allows the fuse to hold through startup surges while still providing fast response to sustained fault conditions. Licensed electricians install this fuse in panelboards, motor control centers, and disconnect enclosures. It ships in a 10-unit pack, weighing 0.42 pounds total.

The A2D20R suits residential and light commercial electrical installations where Class RK1 protection is specified. RK1 fuses offer a higher degree of current limitation compared to standard Class K fuses, making them a common choice in motor branch circuits, HVAC equipment disconnect boxes, and industrial control panels. The 250-volt rating covers single-phase and lower-voltage three-phase applications. Installers typically replace these on a scheduled maintenance cycle or following fault events that result in a blown fuse.

Key Features

• Class RK1 rating provides superior current-limiting performance over standard fuse classes
• Time-delay design tolerates motor and transformer inrush without nuisance opens
• 20-amp continuous current rating at 250 volts AC
• Packed 10 fuses per unit, reducing per-unit cost for service inventory
• Compact form factor: 3.000 inches x 2.060 inches x 1.190 inches

Compatibility

Designed as an OEM-style replacement for Class RK1 time-delay fuse positions in standard fusible disconnects and panelboards rated for 20A at 250 volts AC.

Installation Notes

Installation must be performed by a licensed electrician in accordance with applicable NEC requirements. Always de-energize and lock out the circuit before removing or installing fuses. Verify the replacement fuse class, ampere rating, and voltage rating match the original equipment specification before installing. Do not substitute a higher-amperage or lower-class fuse as a workaround for repeated fuse failures.

Technical Specifications

• Amperage: 20A
• Voltage Rating: 250V
• Fuse Class: RK1
• Fuse Type: Time-Delay
• Dimensions (L x W x H): 3.000 inches x 2.060 inches x 1.190 inches
• Package Quantity: 10 per pack
• Package Weight: 0.42 pounds
• UPC: 78200199084

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: A2D20R