A2D45R - 45 Amp Fuse

A2D45R - 45 Amp Fuse

The Mersen A2D45R Amp-Trap 2000® Class RK1 time-delay fuse is made for electrical systems that need steady, dependable protection in day-to-day operation. Rated at 45 amps, this fuse helps you protect motors, feeders, branch circuits, and other equipment from overloads and short circuits that can lead to costly damage or downtime. Its time-delay design allows normal motor startup surges to pass through without opening the circuit too soon, which makes it especially useful in equipment that cycles on and off throughout the day.

During high fault conditions, the A2D45R responds fast to help protect connected components like starters, switches, and control equipment. The built-in SmartSpot® indicator gives your maintenance teams a quick visual way to identify when the fuse has opened, helping reduce troubleshooting time. This fuse is also commonly used as a replacement for older Class H, K, and RK5 fuses, making upgrades and maintenance simpler in existing systems.

Designed for both 250VAC and 250VDC applications, the A2D45R features a ferrule-style connection with tin-plated copper terminals for reliable conductivity. Its compact PolyTube construction holds up well in industrial and commercial environments where your consistent circuit protection is important.

Key Features and Benefits

• 45 Amp Class RK1 time-delay fuse: Designed for dependable overcurrent protection.
• Dual voltage capability: Rated for 250VAC and 250VDC applications.
• Motor and circuit protection: Helps protect motors, feeders, and branch circuits from overcurrent conditions.
• Time-delay design: Helps prevent nuisance openings during motor startup.
• Fast short-circuit response: Helps reduce equipment damage.
• High interrupting rating: Rated at 200 kA for high fault-current protection.
• SmartSpot® indication system: Provides quick fuse identification.
• Replacement compatibility: Can replace older Class H, K, and RK5 fuses in many applications.
• Tin-plated copper ferrule terminals: Support dependable electrical connections.
• Compact construction: Allows for easy installation in fuse clips.
  

Technical Specifications

• Manufacturer Part Number: A2D45R
  
• Product Series: A2D-R – Amp-Trap 2000®
  
• Fuse Class: Class RK1
  
• Fuse Type: Time-Delay
  
• Ampere Rating: 45A
  
• Rated AC Voltage: 250VAC
  
• Rated DC Voltage: 250VDC
  
• Frequency: 50/60 Hz
  
• Interrupting Rating: 200 kA
  
• Connection Type: Ferrule
  
• Terminal Material: Tin-Plated Copper
  
• Mounting Type: Clip
  
• Indication Type: SmartSpot®
  
• Body Material: PolyTube
  
• Product Diameter: 20.6 mm
  
• Product Length: 76.2 mm
  
• Product Weight: 0.054 kg
  

Material Compliance and Certifications

• RoHS Compliant: Supports environmental compliance standards.
• UL electrical system applications: Designed for dependable low-voltage fuse protection.
• AC and DC compatibility: Suitable for AC and DC circuit protection.
• Durable PolyTube body: Built for dependable insulating performance.
• Tin-plated copper terminals: Designed for long-term electrical conductivity and performance.
  

Where It Works Best

• The Mersen A2D45R works well in industrial facilities, commercial buildings, HVAC systems, motor control panels, manufacturing equipment, and electrical distribution systems where dependable overcurrent protection is needed. It is particularly useful in applications with motor startup loads, where temporary inrush current is expected but strong short-circuit protection is still required.