ECNR300 - 300Amp Fuse

ECNR300 - 300Amp Fuse

When you're working with high-capacity electrical systems, protection needs to be solid, consistent, and built for real-world conditions. The Eaton Edison ECNR300 Fuse is a 300 Amp Class RK5 dual-element time-delay fuse designed specifically for demanding commercial and industrial applications where electrical loads can fluctuate and startup surges are part of normal operation.

Instead of reacting too quickly and disrupting equipment during startup, this fuse is engineered to handle temporary inrush currents from motors, transformers, compressors, and other inductive loads. That means fewer nuisance interruptions and more stable system performance. When a genuine overload or fault occurs, however, the ECNR300 responds quickly to protect downstream equipment and help prevent costly damage.

With a 200 kAIC interrupting rating, this fuse is built for environments where high fault current levels are expected. It provides dependable protection in systems where reliability isn’t optional—it’s required to keep operations running safely and efficiently. Whether it’s used in power distribution, motor control centers, or heavy-duty industrial equipment, the ECNR300 is designed to perform under pressure.

Key Features and Benefits

• 300 Amp rating for high-capacity industrial and commercial systems
• Class RK5 dual-element design for dependable time-delay performance
• Handles motor and transformer inrush currents without nuisance blowing
• High 200 kAIC interrupt rating for strong fault protection
• Helps reduce downtime and unnecessary fuse replacements
• Rated for 250 VAC and 125 VDC applications
• Non-indicating fuse design for straightforward replacement
• Suitable for heavy-duty electrical distribution and equipment protection
• Built for consistent performance in demanding environments

Technical Specifications

• Manufacturer: Eaton
  
• Series: Edison ECNR
  
• Catalog Number: ECNR300
  
• UPC: 782634507512
  
• Product Type: Fuse
  
• Fuse Class: RK5
  
• Amperage Rating: 300 A
  
• Voltage Rating: 250 VAC / 125 VDC
  
• Interrupt Rating: 200 kAIC
  
• Response Time: 10 seconds at 500% overload
  
• Number of Elements: Dual-element
  
• Fuse Indicator: Non-indicating
  
• Special Features: Non current limiting
  
• Dimensions:
  • 3 in L × 0.625 in W × 0.625 in H
• Weight: 0.113 lb
  
• Packaging Type: Standard
  

Material Compliance and Certifications

The Eaton ECNR300 fuse is CE Marked, indicating compliance with applicable safety and performance standards. It is manufactured under Eaton’s quality specifications for industrial electrical protection components and is intended for use in properly rated electrical systems.

Where It Works Best

The ECNR300 is commonly used in applications where electrical demand is high and equipment must operate reliably under varying load conditions:

• Motor control centers (MCCs)
• Industrial machinery and production equipment
• HVAC and large mechanical systems
• Power distribution panels and switchgear
• Transformers and inductive load circuits
• Pumping stations and compressor systems
• Commercial and industrial electrical infrastructure
• OEM heavy equipment applications
• Facility maintenance and replacement projects requiring a 300A RK5 fuse

For systems that demand both strong fault protection and tolerance for normal startup surges, the Eaton Edison ECNR300 delivers dependable performance that helps keep critical operations running safely and efficiently.