Merit Brass TRS300R Time-delay Fuse 300A 600V RK5

Product Description

The MERIT BRASS TRS300R is a 300-amp, 600-volt Class RK5 time-delay fuse designed for overcurrent protection in industrial and commercial electrical distribution systems. It provides dual-element time-delay performance, allowing temporary inrush currents from motors and transformers to pass without nuisance tripping while still responding rapidly to sustained overloads and short-circuit faults. Licensed electricians and electrical contractors install this fuse in fusible disconnects, panelboards, and motor control centers where reliable, code-compliant overcurrent protection is required. At 3.85 pounds and measuring 2.62 inches x 2.62 inches x 11.75 inches, it is a full-size cartridge fuse suited to heavy-duty branch circuit and feeder applications.

This fuse is appropriate for use in residential, commercial, and light industrial electrical systems requiring Class RK5 overcurrent protection. Typical applications include motor branch circuits, feeder circuits, and service entrance equipment where time-delay characteristics are specified to accommodate motor starting inrush. It is packaged individually and intended for installation by qualified electricians working under applicable electrical codes.

Key Features

• 300-amp continuous current rating for heavy-duty branch and feeder circuits
• 600-volt AC rating suitable for standard North American distribution voltages
• Class RK5 dual-element time-delay design tolerates motor starting inrush without nuisance tripping
• Fast response to sustained overloads and short-circuit fault conditions
• Full-size cartridge form factor for compatibility with Class RK5 fusible equipment
• Sold individually, one fuse per pack

Compatibility

Designed as an OEM-style replacement Class RK5 time-delay cartridge fuse for use in fusible disconnects, panelboards, and motor control centers rated for 300A at 600V or below.

Installation Notes

Installation must be performed by a qualified electrician in accordance with the National Electrical Code (NEC) and all applicable local codes. Always de-energize and verify the absence of voltage on the circuit before removing or installing fuses. Use appropriately rated fuse pullers rated for the voltage and current class when handling cartridge fuses of this size. Never replace a fuse with one of a higher ampere rating than the circuit is designed and protected for.

Technical Specifications

• Amperage Rating: 300A
• Voltage Rating: 600V
• Fuse Class: RK5
• Fuse Type: Time-Delay
• Length: 11.75 inches
• Width: 2.62 inches
• Height: 2.62 inches
• Weight: 3.85 pounds
• Quantity per Pack: 1
• UPC: 78200174923

Standard Information

• Brand: MERIT BRASS
• Manufacturer Part Number: TRS300R