Merit Brass A6D1-1/4R 600V RK1 Time Delay Fuse 10 Pack

Product Description

The MERIT BRASS A6D1-1/4R is a 600-volt, Class RK1 time delay fuse designed for overcurrent protection in industrial and commercial electrical systems. Class RK1 fuses provide a higher level of current-limiting performance compared to standard RK5 fuses, making them well-suited for protecting motors, transformers, and sensitive downstream equipment. The time delay characteristic allows harmless inrush currents to pass without nuisance blowing while still responding quickly to sustained fault conditions. Licensed electricians and industrial maintenance technicians are the primary installers of this fuse type.

This fuse is appropriate for use in motor branch circuits, feeder protection, and general-purpose overcurrent protection applications where 600-volt AC systems are present. The RK1 classification meets a higher interrupting rating and tighter current-limiting standards than Class K or standard RK5 devices, which makes it a common specification in commercial and light industrial panel and disconnect applications. The fuse ships in a 10-pack, sized at 5.120 inches x 4.120 inches x 1.750 inches per package.

Key Features

• 600-volt rating suitable for commercial and industrial branch circuit protection
• Class RK1 current-limiting design provides superior short-circuit protection over Class RK5
• Time delay action accommodates motor inrush without nuisance blowing
• 10 fuses per pack for convenient stocking and service calls

Compatibility

Designed as an OEM-style replacement Class RK1 time delay fuse for 600-volt electrical distribution and motor branch circuit applications where a Class RK1 or RK5 fuse holder is installed.

Installation Notes

Installation must be performed by a qualified electrician in accordance with applicable NEC requirements. Always de-energize and lockout/tagout the circuit before removing or installing fuses. Use an appropriate fuse puller rated for the voltage class when servicing fused disconnects. Verify the replacement fuse amperage and voltage rating match the circuit requirements before reinstalling.

Technical Specifications

• Voltage Rating: 600 volts
• Fuse Class: RK1
• Type: Time Delay
• Package Quantity: 10 per pack
• Package Dimensions (L x W x H): 5.120 inches x 4.120 inches x 1.750 inches
• Weight: 1.47 pounds
• UPC: 78200199160

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: A6D1-1/4R