A3T250 - 250Amp Fuse

A3T250 - 250Amp Fuse

The Mersen A3T250 Class T Fast-Acting Fuse is built for electrical systems that can’t afford unnecessary downtime. Designed for commercial and industrial applications, this 250A fuse provides fast response protection against overloads and short circuits while helping protect sensitive equipment from costly damage. Its compact Class T design makes it a practical choice for installations where panel space is limited but reliable protection is still a priority.

What makes the A3T250 stand out is its combination of high current limitation and quick fault-clearing performance. In the event of a short circuit, the fuse reacts rapidly to help reduce let-through energy and limit potential damage to connected equipment. That kind of protection is especially important in motor circuits, distribution panels, UPS systems, and other high-demand electrical setups where reliability matters every day.

The fuse features a glass melamine body for added durability and dimensional stability, along with copper blade terminals that provide a solid, dependable connection. Permanent markings on the blades also make identification easier during maintenance or replacement. With a 200kA interrupting rating, the A3T250 is capable of handling high fault-current environments commonly found in industrial and commercial facilities.

Whether you're maintaining existing equipment or building out a new electrical system, the Mersen A3T250 offers dependable overcurrent protection in a compact, easy-to-install design trusted by electricians, contractors, and maintenance teams alike.

Key Features and Benefits

• Fast-acting protection for overload and short-circuit conditions
• High current-limiting capability helps reduce equipment damage
• Compact Class T design saves space inside electrical equipment
• 250A rating for commercial and industrial power applications
• Rated for 300VAC and 160VDC systems
• 200kA interrupting rating for high fault-current protection
• Glass melamine body provides long-term dimensional stability
• Copper blade terminals support reliable conductivity and secure connections
• Bolted mounting design helps ensure dependable installation

Technical Specifications

• Manufacturer: Mersen
  
• Catalog Number: A3T250
  
• Product Series: A3T Class T Fast-Acting
  
• Fuse Class: Class T
  
• Fuse Type: Fast-Acting
  
• Ampere Rating: 250A
  
• Rated AC Voltage: 300VAC
  
• Rated DC Voltage: 160VDC
  
• Frequency: 50/60 Hz
  
• Interrupting Rating: 200kA AC
  
• Mounting Type: Bolted
  
• Terminal Type: Blade
  
• Terminal Material: Copper
  
• Body Material: GMG / Glass Melamine
  
• Product Length: 69.8 mm
  
• Product Diameter: 33.8 mm
  
• Product Weight: 0.1234 kg
  
• Compliance: RoHS Compliant
  

Material Compliance and Certifications

• The A3T250 fuse is RoHS compliant, helping support current environmental and material compliance standards for industrial and commercial electrical applications.
• It is designed for use in low-voltage UL/CSA fuse systems where dependable circuit protection is required.
  

Where It Works Best

• Industrial control panels
• Commercial power distribution equipment
• Motor protection circuits
• HVAC systems
• UPS and backup power equipment
• Renewable energy and solar applications
• OEM machinery and manufacturing equipment
• High fault-current electrical systems
• Its fast-acting performance makes it a strong choice for protecting sensitive electrical components and helping reduce unexpected downtime in demanding environments.