Merit Brass A6D150R Time-delay Fuse 150A 600V RK1

Product Description

The MERIT BRASS A6D150R is a Class RK1 time-delay fuse rated for 150 amps at 600 volts. It provides overcurrent protection in industrial and commercial electrical systems where motor loads, transformers, and other inductive equipment require a fuse that can tolerate brief startup surges without nuisance tripping. The RK1 classification indicates a rejection-style fuse body that prevents installation in lower-rated fuse holders, an important safety feature in properly coordinated systems. Licensed electricians and maintenance technicians install this fuse as part of branch circuit and feeder protection schemes.

This fuse is suited for use in motor branch circuits, disconnect switches, combination starters, and panelboards where a 600-volt, Class RK1 time-delay fuse is specified. Its time-delay characteristic makes it appropriate for single-phase and three-phase motor applications in residential service entrance equipment, light commercial HVAC systems, and industrial control panels. The fuse is typically specified by electrical engineers and installed per NEC Article 240 requirements.

Key Features

• 150-amp continuous current rating for heavy motor and feeder circuit protection
• 600-volt rating suitable for standard commercial and industrial distribution voltages
• Class RK1 rejection design prevents installation in non-RK1 fuse holders
• Time-delay action tolerates motor inrush and transformer magnetizing currents without nuisance opening
• Single-unit packaging for individual replacement or spare inventory

Compatibility

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

Installation Notes

Installation must be performed by a qualified electrician in accordance with NEC Article 240 and any applicable local codes. De-energize and lockout/tagout the circuit at the upstream overcurrent device before removing or installing the fuse. Verify that the fuse holder is rated for Class RK1 bodies and that the replacement ampere rating matches the circuit design. Never use a fuse as a substitute for proper circuit coordination analysis.

Technical Specifications

• Ampere Rating: 150 amps
• Voltage Rating: 600 volts
• Fuse Class: RK1
• Fuse Type: Time-Delay
• Dimensions (L x W x H): 10.000 inches x 1.940 inches x 1.940 inches
• Weight: 1.720 pounds
• Quantity per Pack: 1
• UPC: 78200199216

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: A6D150R