Merit Brass A2K125R 250V RK1 Time-delay Fuse 125A

Product Description

The MERIT BRASS A2K125R is a 125-amp, 250-volt Class RK1 time-delay fuse designed for overcurrent protection in industrial and commercial electrical systems. Class RK1 fuses provide high-performance current-limiting protection, helping to safeguard motors, transformers, feeders, and branch circuits from damage caused by overloads and short circuits. The time-delay design allows motors and other inductive loads to start without nuisance blowing, while still responding quickly to sustained fault conditions. Licensed electricians install this fuse type in accordance with NEC requirements for branch-circuit and feeder protection.

The A2K125R is suited for use in motor branch circuits, feeder circuits, and combination motor controllers in residential, commercial, and light industrial applications. The RK1 class designation indicates a rejection-style fuse that fits only RK1-rated fuse holders and blocks, preventing accidental substitution with lower-rated fuse classes. It is appropriate for installations where current-limiting protection is required or specified by the engineer of record.

Key Features

• 125-amp continuous current rating for high-ampacity branch and feeder circuits
• 250-volt AC voltage rating suitable for single-phase and three-phase systems
• Class RK1 current-limiting design provides superior arc energy reduction
• Time-delay action tolerates motor inrush without nuisance opening
• Rejection-style form factor prevents substitution with lower-performance fuse classes

Compatibility

Designed as an OEM-style replacement for Class RK1 fuse applications requiring a 125-amp, 250-volt time-delay current-limiting fuse in standard RK1-rated fuse holders and disconnects.

Installation Notes

Installation must be performed by a licensed electrician. Always de-energize and lock out the circuit at the panel before removing or installing any fuse. Verify that the fuse holder or disconnect is rated for Class RK1 fuses and matches the voltage and amperage of this fuse before installation. Follow applicable NEC guidelines for overcurrent protection device selection and circuit sizing.

Technical Specifications

• Amperage: 125 amps
• Voltage: 250 volts
• Fuse Class: RK1
• Fuse Type: Time-Delay, Current-Limiting
• UPC: 78200191526

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: A2K125R