A6D40R - 40 Amp Fuse

A6D40R - 40 Amp Fuse

When electrical systems are pushed hard every day, dependable circuit protection is not optional. The Mersen A6D40R Amp-Trap 2000® Class RK1 time-delay fuse is engineered to help keep industrial and commercial equipment running safely while minimizing unnecessary downtime. Built for demanding applications, this 40A fuse combines fast short-circuit protection with the time-delay performance needed to handle temporary motor startup currents without nuisance openings. That means better protection for motors, control panels, feeders, branch circuits, and other valuable electrical components that facilities rely on every day.

Part of Mersen’s trusted Amp-Trap 2000® A6D-R series, the A6D40R responds quickly during severe fault conditions to help limit damage to switches, contactors, motor starters, and downstream equipment. At the same time, its time-delay design allows motors and transformers to handle inrush currents during startup, helping operations stay productive instead of dealing with avoidable interruptions. Whether you are maintaining an existing electrical system or upgrading older Class H, K, or RK5 fuses, the A6D40R offers a reliable solution trusted across manufacturing plants, HVAC systems, commercial buildings, and industrial facilities.

One feature electricians and maintenance teams appreciate is the built-in SmartSpot® indication system. When the fuse opens, the visual indicator helps identify the blown fuse quickly, reducing troubleshooting time and making maintenance faster and more efficient. Designed with ferrule terminals, tin-plated copper connections, and a durable PolyTube body, this fuse is made for long-term performance in demanding electrical environments where reliability matters.

Key Features and Benefits

• 40A Class RK1 time-delay fuse: Designed for commercial and industrial applications.
• Equipment protection: Helps protect motors, feeders, branch circuits, and sensitive electrical equipment.
• Time-delay characteristics: Help reduce nuisance fuse openings caused by motor inrush currents.
• Fast current-limiting protection: Helps minimize damage during short-circuit events.
• SmartSpot® visual indication system: Speeds up troubleshooting and maintenance.
• 600VAC / 600VDC rated: Rated for both 600VAC and 600VDC applications.
• High interrupting rating: High 200 kA interrupting rating for added protection in high fault-current systems.
• Replacement compatibility: Ideal replacement for older Class H, K, and RK5 fuses.
• Ferrule terminal construction: With tin-plated copper connections for dependable conductivity.
• Durable PolyTube body: Built for demanding operating conditions.
  

Technical Specifications

• Manufacturer: Mersen
  
• Catalog Number: A6D40R
  
• Series: Amp-Trap 2000® A6D-R
  
• Product Type: Time-Delay Fuse
  
• Fuse Class: RK1
  
• Ampere Rating: 40A
  
• 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: Ferrule
  
• Terminal Material: Tin-Plated Copper
  
• Body Material: PolyTube
  
• Product Diameter: 26.9 mm
  
• Product Length: 139.7 mm
  
• Product Weight: 0.1542 kg
  
• UPC/EAN: 782001992019
  

Material Compliance and Certifications

• The Mersen A6D40R fuse is part of the Amp-Trap 2000® low-voltage fuse family designed for UL and CSA applications. Its Class RK1 construction provides high current-limiting protection and supports IEC Type 2 “no damage” protection when properly applied in motor and branch circuit systems.
  

Where It Works Best

The A6D40R is a strong fit for applications where dependable overcurrent protection and reduced downtime are priorities, including:

• Motor control centers (MCCs)
• Industrial manufacturing equipment
• HVAC and refrigeration systems
• Pumps and compressors
• Commercial electrical distribution systems
• Feeders and branch circuits
• Conveyor systems and automated machinery
• Switchgear and control panels
• Retrofit projects replacing older Class H, K, or RK5 fuses
• Facilities with high available fault-current levels

From industrial plants to commercial facilities, the Mersen A6D40R delivers the combination of safety, performance, and reliability electricians and maintenance professionals count on to keep critical systems protected and operations moving forward.