Merit Brass A2K150R 250V RK1 Time-delay Fuse 150 Amp

Product Description

The MERIT BRASS A2K150R is a 250-volt, Class RK1 time-delay fuse rated at 150 amps. RK1 fuses are a high-performance class known for their current-limiting capability and rejection-style ferrule design, which prevents installation in lower-rated fuse holders. This fuse provides overcurrent protection for motors, transformers, and other inductive loads where a brief startup surge must be tolerated without nuisance opening. Licensed electricians and industrial maintenance technicians install this type of fuse in disconnect switches, panelboards, and motor control centers requiring UL Class RK1-rated protection.

Class RK1 time-delay fuses are used in residential, commercial, and light industrial electrical systems where both short-circuit and overload protection are required in a single device. The 150-amp rating suits larger motor branch circuits, feeder circuits, and service-entrance equipment operating at 250 volts or less. This fuse is appropriate for use in fuse blocks and safety switches that accept Class RK1 rejection-style fuses.

Key Features

• 250-volt AC voltage rating suitable for single-phase and three-phase circuits
• 150-amp continuous current rating for large motor and feeder applications
• Class RK1 current-limiting design reduces let-through energy during fault conditions
• Time-delay characteristic tolerates motor inrush current without nuisance blowing
• Rejection-style ferrule prevents installation in Class H or lower-rated fuse holders

Compatibility

Designed as an OEM-style replacement for Class RK1 fuse applications in safety switches, disconnect enclosures, and motor control equipment rated for 250 volts and 150 amps.

Installation Notes

Installation must be performed by a licensed electrician in accordance with the National Electrical Code (NEC). Always de-energize and lock out the circuit before opening the fuse holder or disconnect enclosure. Verify that the fuse holder is rated for Class RK1 rejection fuses and matches the voltage and ampere rating of this device. Do not install this fuse in a holder rated below its Class RK1 specification.

Technical Specifications

• Voltage Rating: 250 volts
• Ampere Rating: 150 amps
• Fuse Class: RK1
• UPC: 78200191527

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: A2K150R