A2D40R - 40 Amp Fuse

A2D40R - 40 Amp Fuse

When your electrical systems face demanding startup loads and potentially damaging fault currents, the Mersen A2D40R Amp-Trap 2000® Class RK1 Time-Delay Fuse is built to keep critical equipment protected and operations moving smoothly. Designed for industrial and commercial power distribution systems, this 40 Amp fuse combines advanced time-delay performance with fast-acting short-circuit protection, giving motors and electrical equipment the protection they need without nuisance openings during temporary inrush currents.

What makes the A2D40R especially valuable in motor control and branch circuit applications is its ability to respond quickly under severe fault conditions while still allowing normal motor startups to occur uninterrupted. That balance helps you reduce unnecessary downtime and protects expensive electrical components such as motor starters, switches, and control equipment from damaging overloads. The built-in SmartSpot® visual indication system also makes maintenance easier by providing a clear visual signal when the fuse opens, helping your technicians identify issues faster and restore systems more efficiently.

It also serves as an excellent upgrade or replacement for older Class H, K, and RK5 fuses already installed in existing systems.

Key Features and Benefits

• Designed for industrial and commercial overcurrent protection
• Advanced Class RK1 time-delay performance helps prevent nuisance fuse openings
• Delivers fast short-circuit protection for motors, feeders, and branch circuits
• Helps protect motor starters, switches, and electrical components from fault damage
• Built-in SmartSpot® blown fuse indication speeds up troubleshooting and maintenance
• High 200 kA interrupting rating enhances system protection under extreme fault conditions
• Suitable for both AC and DC applications
• Direct replacement option for many Class H, K, and RK5 fuses
  

Technical Specifications

• Manufacturer: Mersen
  
• Catalog Number: A2D40R
  
• Product Series: A2D-R / Amp-Trap 2000®
  
• Fuse Class: Class RK1
  
• Fuse Type: Time-Delay
  
• Ampere Rating: 40A
  
• Rated AC Voltage: 250VAC
  
• Rated DC Voltage: 250VDC
  
• Frequency: 50/60 Hz
  
• Interrupting Rating: 200 kA AC
  
• Terminal Type: Ferrule
  
• Mounting Type: Clip
  
• Indication Type: SmartSpot®
  
• Terminal Material: Tin-Plated Copper
  
• Body Material: PolyTube
  
• Product Diameter: 20.6 mm
  
• Product Length: 76.2 mm
  
• Product Weight: 0.054 kg
  
• Compliance: RoHS Compliant
  

Material Compliance and Certifications

• The Mersen A2D40R fuse is RoHS compliant, helping support environmental and material safety standards commonly required in modern industrial and commercial facilities. Manufactured to meet demanding UL and CSA performance expectations, this fuse delivers dependable circuit protection for critical electrical infrastructure.
  

Where It Works Best

• The A2D40R is a smart choice for applications where motors, feeders, and branch circuits require reliable overcurrent protection without sacrificing uptime. Common applications include:
• Motor control centers
• Industrial automation equipment
• HVAC systems and compressors
• Manufacturing and processing facilities
• Commercial electrical distribution systems
• Control panels and switchgear
• Pumps, conveyors, and heavy-duty machinery
• Existing systems using Class H, K, or RK5 fuses