Merit Brass A6D250R 600V RK1 Time-delay Fuse 250A

Product Description

The MERIT BRASS A6D250R is a 250-amp, 600-volt Class RK1 time-delay fuse designed for overcurrent protection in industrial and commercial electrical distribution systems. The RK1 classification indicates a high-performance, rejection-style fuse that provides superior current-limiting capability compared to standard Class K fuses. The time-delay feature allows temporary inrush currents from motor loads to pass without nuisance tripping while still protecting downstream components from sustained fault conditions. Licensed electricians and electrical contractors install this type of fuse in disconnect switches, motor control centers, and panelboards where branch-circuit and feeder protection is required.

This fuse is suited for applications involving motor branch circuits, HVAC equipment feeders, and general-purpose electrical distribution panels operating at up to 600 volts AC. The RK1 rejection feature physically prevents installation of lower-rated fuse classes in the same fuseholder, helping enforce proper overcurrent protection schemes. Single-unit packaging makes it a practical replacement pull for service and maintenance calls.

Key Features

• 250-amp continuous current rating at 600 volts AC
• Class RK1 rejection-style design prevents substitution of lower-rated fuses
• Time-delay construction tolerates motor inrush without nuisance tripping
• Current-limiting performance reduces let-through energy during fault events
• Packaged individually, suitable for single-fuse replacement service work

Compatibility

Designed as an OEM-style replacement Class RK1 time-delay fuse for use in 600-volt-rated fuseholders and disconnect switches that accept RK1 rejection-style fuses.

Installation Notes

Installation must be performed by a qualified, licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out the circuit at the upstream disconnect or panelboard before removing or installing fuses. Verify the fuseholder is rated for Class RK1 fuses and confirm the replacement amperage matches the original overcurrent protection device. Never install a fuse with a higher amperage rating than the circuit or equipment is designed to carry.

Technical Specifications

• Amperage: 250 amps
• Voltage Rating: 600 volts
• Fuse Class: RK1
• Fuse Type: Time-Delay
• Package Dimensions (L x W x H): 11.750 inches x 2.620 inches x 2.620 inches
• Weight: 3.570 pounds
• Quantity per Pack: 1
• UPC: 78200199222

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: A6D250R