ECNR400 - 400Amp Fuse

ECNR400 - 400Amp Fuse

When you’re dealing with large electrical systems, there’s no margin for guesswork. Equipment has to start smoothly, run consistently, and still be fully protected when something goes wrong. The Eaton Edison ECNR400 Fuse is a 400 Amp Class RK5 dual-element time-delay fuse designed for exactly that kind of environment—where heavy electrical loads, motor startups, and industrial power demands all happen as part of everyday operation.

With a 200 kAIC interrupting rating, the ECNR400 is built for demanding industrial environments where fault current levels can be significant. It is rated for 250 VAC and 125 VDC systems, making it suitable for a wide range of heavy-duty commercial and industrial applications. Whether it’s installed in a motor control center, main distribution panel, or large-scale OEM equipment, this fuse is designed to deliver dependable performance under pressure.

Key Features and Benefits

• 400 Amp Class RK5 fuse for high-capacity industrial electrical systems
• Dual-element time-delay design helps handle motor and transformer inrush currents
• Reduces nuisance fuse openings during normal startup conditions
• High 200 kAIC interrupting rating for strong fault-current protection
• Rated for 250 VAC and 125 VDC applications
• Helps improve system uptime and reduce unexpected shutdowns
• Suitable for motors, transformers, compressors, and heavy electrical loads
• Non-indicating design for straightforward field replacement
• Built for demanding commercial and industrial environments

Technical Specifications

• Manufacturer: Eaton
  
• Series: Edison ECNR
  
• Catalog Number: ECNR400
  
• UPC: 782634507536
  
• Product Type: Fuse
  
• Fuse Class: RK5
  
• Amperage Rating: 400 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: 2.875 in L × 0.625 in W × 0.625 in H
  
• Weight: 0.114 lb
  
• Packaging Type: Standard
  

Material Compliance and Certifications

The Eaton ECNR400 fuse is CE Marked, confirming compliance with applicable safety and performance standards. It is manufactured under Eaton’s quality control systems and intended for use in properly rated electrical installations following all applicable electrical codes and engineering practices.

Where It Works Best

The ECNR400 is commonly used in high-demand electrical environments where loads are large and system uptime is critical:

• Motor control centers (MCCs)
• Heavy industrial machinery and production systems
• HVAC systems and large mechanical equipment
• Power distribution panels and switchgear
• Transformer and inductive load circuits
• Pumping stations and compressor systems
• Commercial and industrial electrical infrastructure
• OEM heavy-duty equipment applications
• Facility maintenance and large-scale fuse replacement projects

For systems that need strong fault protection but also have to handle everyday startup surges without interruption, the Eaton Edison ECNR400 delivers a dependable, field-proven solution that helps keep operations running safely and consistently.