A2K400R - 400Amp Fuse

A2K400R - 400Amp Fuse

When electrical systems are exposed to high fault currents, dependable circuit protection becomes critical. The Mersen A2K400R Amp-Trap® Class RK1 Fast-Acting Fuse is built to help keep industrial and commercial power systems running safely and efficiently by reacting quickly to overloads and short circuits before costly damage can occur. Designed for demanding branch and feeder circuit applications, this 400A fast-acting fuse delivers advanced current-limiting protection that helps reduce stress on connected equipment while improving overall system reliability.

Built with durability and performance in mind, the A2K400R features a compact blade-style design with tin-plated copper terminals for solid electrical connections and dependable conductivity. Its rugged PolyTube insulating body stands up well in challenging environments often found in manufacturing plants, power distribution systems, and commercial facilities. Because it is rated for both 250VAC and 250VDC applications, this fuse gives maintenance teams and electrical professionals added flexibility across a wide range of installations.

Whether you are protecting switchboards, panelboards, motor control centers, or other critical electrical infrastructure, the Mersen A2K400R fuse provides the fast response and high interrupting capacity needed to help minimize downtime and protect valuable equipment.

Key Features and Benefits

• Fast-acting Class RK1 fuse engineered for rapid overload and short-circuit response
• Current-limiting protection helps reduce potential damage to downstream electrical equipment
• Rated for both 250VAC and 250VDC systems for versatile installation options
• High 200 kA interrupting rating supports applications with elevated available fault currents
• Blade terminal construction with tin-plated copper connections promotes reliable conductivity
• Excellent choice for branch circuit, feeder circuit, and backup protection applications
• PolyTube insulating body offers dependable durability in demanding operating conditions
• RoHS compliant materials support modern environmental and compliance standards
  

Technical Specifications

• Manufacturer: Mersen
  
• Catalog Number: A2K400R
  
• Product Type: Amp-Trap® Fuse
  
• Fuse Class: Class RK1
  
• Speed/Characteristic: Fast-Acting
  
• Ampere Rating: 400A
  
• Voltage Rating AC: 250VAC
  
• Voltage Rating DC: 250VDC
  
• Frequency: 50/60 Hz
  
• Interrupting Rating: 200 kA AC
  
• Terminal Type: Blade
  
• Terminal Material: Tin-Plated Copper
  
• Mounting Type: Clip
  
• Body Material: PolyTube
  
• Product Length: 219.2 mm
  
• Product Diameter: 52.4 mm
  
• Product Weight: 0.762 kg
  
• Compliance: RoHS Compliant
  

Material Compliance and Certifications

• The Mersen A2K400R fuse is RoHS compliant, making it suitable for facilities and projects that require environmentally conscious material standards. Manufactured using quality insulating and conductive materials, including a PolyTube body and tin-plated copper terminals, this fuse is designed to deliver dependable electrical performance and long service life in industrial and commercial applications.
  

Where It Works Best

It is commonly used in:

• Industrial power distribution systems
• Switchboards and panelboards
• Motor control centers
• Branch and feeder circuit protection
• Backup protection for electrical equipment
• Manufacturing and processing facilities
• Commercial electrical infrastructure
• Heavy-duty power distribution equipment