Merit Brass A6D90R 600V Class RK1 Time-delay Fuse 90A 5pk

Product Description

The MERIT BRASS A6D90R is a 600-volt, Class RK1 time-delay fuse rated at 90 amps, sold in a 5-pack. Time-delay fuses in the RK1 class provide a high degree of current limitation combined with the ability to hold through brief inrush currents without nuisance opening. This makes the A6D90R well suited for motor loads, HVAC equipment, and industrial control circuits where startup surge currents would otherwise trip a fast-acting fuse. Licensed electricians install these fuses as part of branch-circuit or feeder overcurrent protection in accordance with NEC requirements.

Class RK1 fuses deliver tighter current-limitation performance than Class RK5, making them the preferred choice in applications where equipment and wiring must be protected from high fault-current let-through. Typical installations include motor-disconnect fuseholders, HVAC unit disconnects, distribution panelboards, and industrial control panels rated up to 600 volts AC. The 90-amp rating fits mid-size motor branch circuits and equipment circuits commonly found in light commercial and industrial settings.

Key Features

• 600-volt AC voltage rating covers most commercial and industrial branch circuits
• Class RK1 current-limiting design reduces fault-current let-through compared to Class RK5
• Time-delay action tolerates motor inrush without nuisance opening
• 90-amp rating suitable for mid-size motor and equipment protection
• 5-pack quantity reduces per-unit cost and supports stocking common replacement sizes

Compatibility

Designed for use in Class RK1-rated fuseholders and disconnect switches rated for 600 volts AC and 90 amps or greater. Verify fuseholder class acceptance before installation.

Installation Notes

Installation must be performed by a licensed electrician in compliance with the National Electrical Code (NEC) and any applicable local codes. De-energize and lock out the circuit at the upstream overcurrent device before opening the fuseholder or disconnect. Use an insulated fuse puller sized for the fuse body to remove and install cartridge fuses safely. Never replace a fuse with a higher ampere rating than the circuit or equipment is designed for.

Technical Specifications

• Voltage Rating: 600 volts
• Ampere Rating: 90 amps
• Fuse Class: RK1
• Fuse Type: Time-Delay
• Quantity per Pack: 5
• Package Dimensions (L x W x H): 8.000 inches x 6.660 inches x 1.380 inches
• Package Weight: 3.41 pounds
• UPC: 78200199210

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: A6D90R