A6D400R - 400Amp Fuse

A6D400R - 400Amp Fuse

The Mersen A6D400R Amp-Trap 2000® Class RK1 time-delay fuse is designed for your electrical systems that need dependable protection without creating unnecessary downtime. Rated at 400 amps for both 600VAC and 600VDC applications, this fuse helps protect motors, feeders, branch circuits, and other power distribution equipment from overloads and short circuits while still allowing normal startup currents to pass during operation.

In many industrial and commercial systems, large motors draw extra current for a short time during startup. The A6D400R is built to handle those temporary inrush currents without opening too soon, helping equipment stay online and operations run more smoothly. If a serious fault occurs, the fuse reacts quickly to help reduce damage to switches, motor starters, contactors, and connected electrical components.

Part of Mersen’s Amp-Trap 2000® A6D-R series, the A6D400R is commonly used in manufacturing facilities, HVAC systems, motor control centers, pumps, compressors, conveyor systems, and commercial distribution equipment. It can also replace older Class H, K, and RK5 fuses already installed in existing systems, making maintenance and upgrade projects more straightforward for electricians and facility teams.

The built-in SmartSpot® indication system gives maintenance personnel a quick visual indication when the fuse has opened, helping reduce troubleshooting time during service work. Its blade-style terminals with tin-plated copper connections provide dependable conductivity, while the PolyTube body is designed for long service life in demanding electrical environments.

Key Features and Benefits

• 400A Class RK1 time-delay fuse: For industrial and commercial applications.
• Equipment protection: Helps protect motors, feeders, branch circuits, and distribution equipment.
• Time-delay performance: Helps reduce nuisance openings during motor startup.
• Fast current-limiting protection: During severe fault conditions.
• SmartSpot® indication: Helps simplify troubleshooting and maintenance.
• 600VAC / 600VDC rated: Rated for both 600VAC and 600VDC systems.
• High interrupting rating: 200 kA interrupting rating for high fault-current protection.
• Replacement compatibility: Replacement option for older Class H, K, and RK5 fuses.
• Blade-style terminals: With tin-plated copper connections.
• Durable construction: PolyTube insulating body designed for demanding environments.
  

Technical Specifications

• Manufacturer: Mersen
  
• Catalog Number: A6D400R
  
• Series: Amp-Trap 2000® A6D-R
  
• Product Type: Time-Delay Fuse
  
• Fuse Class: RK1
  
• Ampere Rating: 400A
  
• Voltage Rating: 600VAC / 600VDC
  
• Frequency: 50/60 Hz
  
• Current Type: AC/DC
  
• Interrupting Rating: 200 kA
  
• Fuse Characteristic: Time Delay
  
• Indication System: SmartSpot®
  
• Mounting Type: Clip
  
• Terminal Type: Blade
  
• Terminal Material: Tin-Plated Copper
  
• Body Material: PolyTube
  
• Product Diameter: 65 mm
  
• Product Length: 295.4 mm
  
• Product Weight: 1.4606 kg
  
• UPC/EAN: 782001992255
  

Material Compliance and Certifications

• The Mersen A6D400R fuse is part of the Amp-Trap 2000® low-voltage fuse family and is designed for UL and CSA electrical applications.
  

Where It Works Best

The A6D400R is commonly used in applications such as:

• Motor control centers (MCCs)
• Industrial manufacturing equipment
• HVAC and refrigeration systems
• Pumps and compressors
• Conveyor and automation systems
• Commercial power distribution panels
• Feeders and branch circuits
• Heavy-duty machinery
• Retrofit projects replacing older Class H, K, or RK5 fuses
• Electrical systems with high available fault currents

For facilities looking to improve equipment protection while reducing unnecessary interruptions, the Mersen A6D400R delivers dependable performance for demanding industrial and commercial electrical systems.