A2D300R - 300 Amp Fuse

A2D300R - 300 Amp Fuse

The Mersen A2D300R Amp-Trap 2000® Class RK1 Time-Delay Fuse is designed for electrical systems that need dependable protection without sacrificing performance during equipment startup. Rated at 300 amps, this fuse helps protect motors, feeders, and branch circuits from damaging short circuits and overcurrent conditions while still allowing temporary in-rush currents that are common during motor startup.

Built as part of Mersen’s trusted Amp-Trap 2000® series, the A2D300R reacts quickly during fault conditions to help reduce the risk of damage to switches, starters, and other important electrical components. At the same time, its time-delay design helps minimize nuisance fuse openings that can interrupt operations and create unnecessary downtime.

A standout feature is the built-in SmartSpot® blown fuse indicator, which gives maintenance teams a quick visual indication when the fuse has operated. That can save valuable troubleshooting time in busy industrial and commercial environments. The fuse can also serve as a replacement for older Class H, K, and RK5 fuses already installed in existing systems, making upgrades and maintenance more straightforward.

Whether you're installing it in a motor control center, HVAC system, manufacturing facility, or power distribution setup, the A2D300R is built for applications where reliable circuit protection matters every day.

Key Features and Benefits

• 300 Amp Class RK1 time-delay fuse: Designed for industrial and commercial applications.
• Overcurrent protection: Helps protect motors, feeders, and branch circuits from overcurrent damage.
• Time-delay operation: Helps handle temporary startup and in-rush currents.
• SmartSpot® indication: Provides quick visual fuse status identification.
• High interrupting rating: Rated up to 200 kA for demanding electrical systems.
• AC and DC compatibility: Suitable for both AC and DC applications.
• Replacement capability: Can replace existing Class H, K, and RK5 fuses in many systems.
• Tin-plated copper blade terminals: Support reliable conductivity.
• Durable PolyTube construction: Designed for long service life.
  

Technical Specifications

• Manufacturer: Mersen
  
• Catalog Number: A2D300R
  
• Product Series: A2D-R / Amp-Trap 2000®
  
• Product Type: Class RK1 Time-Delay Fuse
  
• Ampere Rating: 300A
  
• Rated AC Voltage: 250VAC
  
• Rated DC Voltage: 250VDC
  
• Frequency: 50/60 Hz
  
• Fuse Class: RK1
  
• Speed / Characteristic: Time Delay
  
• Interrupting Rating: 200 kA
  
• Indication System: SmartSpot®
  
• Mounting Type: Clip
  
• Terminal Type: Blade
  
• Terminal Material: Tin-Plated Copper
  
• Body Material: PolyTube
  
• Product Length: 219.2 mm
  
• Product Diameter: 52.3 mm
  
• Product Weight: 0.7439 kg
  

Material Compliance and Certifications

• RoHS Compliant: Manufactured to support modern environmental standards.
• Designed for UL applications: Suitable for demanding low-voltage fuse applications.
• AC and DC protection: Suitable for AC and DC circuit protection requirements.
• UL/CSA applications: Manufactured for low-voltage UL/CSA fuse applications.
  

Where It Works Best

• The Mersen A2D300R is commonly used in industrial facilities, commercial buildings, motor control centers, HVAC equipment, manufacturing systems, and power distribution applications. It’s especially useful in systems that experience high startup currents but still require strong short-circuit protection for sensitive electrical equipment.