A6D300R - 300Amp Fuse

A6D300R - 300Amp Fuse

When electrical systems are pushed hard every day, dependable circuit protection is not optional. The Mersen A6D300R Amp-Trap 2000® Class RK1 time-delay fuse is designed to help keep your industrial and commercial equipment running safely while protecting valuable electrical components from damaging overloads and short circuits. Rated at 300 amps with both 600VAC and 600VDC capability, this high-performance fuse combines fast fault-clearing protection with the time-delay performance needed to handle temporary motor startup surges without nuisance openings.

Built for demanding applications, the A6D300R reacts quickly during severe fault conditions to help reduce damage to your motor starters, switches, contactors, and other sensitive power distribution equipment. At the same time, its time-delay design allows normal motor inrush currents to pass during startup, helping improve uptime and reduce unnecessary maintenance interruptions. This makes it an excellent solution for motor control centers, manufacturing equipment, HVAC systems, pumps, conveyors, and other heavy-duty electrical applications where reliability matters.

Constructed with a durable PolyTube insulating body and tin-plated copper blade terminals, the A6D300R is built to perform in tough operating conditions while maintaining dependable conductivity and long service life. With a high 200 kA interrupting rating, this Class RK1 fuse is ready for applications where strong short-circuit protection is critical.

Key Features and Benefits

• 300A Class RK1 time-delay fuse: For industrial and commercial electrical systems.
• Equipment protection: Helps protect motors, feeders, branch circuits, and power distribution equipment.
• Time-delay design: Reduces nuisance fuse openings during motor startup.
• Fast-acting current limitation: Under high fault conditions.
• IEC Type 2 support: Supports IEC Type 2 “no damage” coordinated protection applications.
• SmartSpot® indication: Blown fuse indication for faster maintenance and troubleshooting.
• Dual-rated performance: Dual-rated for 600VAC and 600VDC systems.
• High interrupting capacity: High 200 kA interrupting rating for demanding fault-current environments.
• PolyTube construction: Durable PolyTube construction designed for long-term reliability.
• Tin-plated copper blade terminals: Help improve conductivity and corrosion resistance.
• Replacement compatibility: Suitable replacement for older Class H, K, and RK5 fuses.
  

Technical Specifications

• Manufacturer: Mersen
  
• Catalog Number: A6D300R
  
• Series: Amp-Trap 2000® A6D-R
  
• Product Type: Class RK1 Time-Delay Fuse
  
• Ampere Rating: 300A
  
• Voltage Rating AC: 600VAC
  
• Voltage Rating DC: 600VDC
  
• Frequency: 50/60 Hz
  
• Fuse Class: RK1
  
• Fuse Characteristic: Time Delay
  
• Interrupting Rating: 200 kA
  
• Indication System: SmartSpot®
  
• Connection Type: Blade
  
• Terminal Material: Tin-Plated Copper
  
• Mounting: Clip
  
• Body Material: PolyTube
  
• Product Diameter: 65 mm
  
• Product Length: 295.4 mm
  
• Product Weight: 1.4606 kg
  

Material Compliance and Certifications

• The Mersen A6D300R is manufactured for low-voltage UL and CSA applications and is engineered to support IEC Type 2 coordinated protection requirements when properly applied.
• Its durable insulating materials and high-quality conductive components are designed to deliver consistent performance in demanding industrial and commercial environments.
  

Where It Works Best

• Motor control centers (MCCs)
• Industrial automation equipment
• HVAC systems and compressors
• Manufacturing and processing facilities
• Pumps and conveyor systems
• Commercial power distribution equipment
• Feeders and branch circuits
• Retrofit projects replacing older Class H, K, or RK5 fuses
• Electrical systems with high available fault currents