A4J250 - 250 Amp Fuse

A4J250 - 250 Amp Fuse

Protecting critical electrical equipment starts with choosing the right fuse, and the Mersen A4J250 Amp-Trap® Class J Fast-Acting Fuse is built for exactly that purpose. Designed for demanding commercial and industrial environments, this 250A fuse reacts quickly to overloads and short circuits before they can cause costly damage to electrical systems. Whether you’re maintaining a power distribution panel, upgrading motor protection, or servicing industrial equipment, the A4J250 delivers the fast-acting performance and current-limiting protection professionals count on to keep your operations running safely and efficiently.

Part of Mersen’s trusted Amp-Trap® A4J series, the A4J250 combines high interrupting capacity with a compact Class J footprint, helping reduce the risk of installing incorrect replacement fuses with lower performance ratings. Its fast response time helps protect sensitive components from excessive fault current, reducing downtime and helping extend the life of connected equipment. Rated for 600VAC and 300VDC applications, this fuse is suitable for a wide range of AC and DC electrical systems commonly found in manufacturing facilities, commercial buildings, HVAC systems, control panels, and heavy-duty industrial applications.

Built with durable GMG insulating material and brass alloy blade terminals, the A4J250 is engineered for dependable long-term performance in challenging environments. With a 200 kA interrupting rating, it’s capable of handling high fault-current conditions while maintaining reliable circuit protection where it matters most. For electricians, facility managers, and maintenance professionals looking for dependable overcurrent protection, the Mersen A4J250 offers the combination of safety, speed, and performance modern electrical systems demand.

Key Features and Benefits

• Fast-acting Class J fuse: Designed for rapid fault interruption.
• 250A ampere rating: Suitable for demanding industrial and commercial applications.
• 600VAC and 300VDC ratings: Support both AC and DC systems.
• Advanced current-limiting protection: Helps minimize equipment damage.
• High 200 kA interrupting rating: Suitable for challenging fault-current conditions.
• Compact Class J design: Helps prevent incorrect fuse replacement.
• Brass alloy blade terminals: Provide secure electrical connections.
• Helps reduce downtime and improve electrical system reliability: Supports dependable system performance.
• Ideal for protecting sensitive electrical and power distribution equipment: Suitable for commercial and industrial electrical systems.
  

Technical Specifications

• Manufacturer: Mersen
  
• Catalog Number: A4J250
  
• Series: Amp-Trap® A4J
  
• Fuse Class: Class J
  
• Fuse Type: Fast-Acting
  
• Ampere Rating: 250A
  
• Rated Voltage AC: 600VAC
  
• Rated Voltage DC: 300VDC
  
• Frequency: 50/60 Hz
  
• Interrupting Rating: 200 kA AC
  
• Mounting Type: Clip
  
• Connection Type: Blade
  
• Terminal Material: Brass Alloy
  
• Insulating Material: GMG
  
• Product Diameter: 54 mm
  
• Product Length: 181.1 mm
  
• Product Weight: 0.7938 kg
  

Material Compliance and Certifications

• ROHS Compliant: Designed to support environmental compliance requirements.
• Low Voltage UL/CSA Applications: Designed for Low Voltage UL/CSA fuse applications.
  

Where It Works Best

• The Mersen A4J250 is commonly used in power distribution systems, motor control centers (MCCs), industrial machinery and automation equipment, HVAC and refrigeration systems, commercial electrical panels, manufacturing facilities, branch circuit protection, and control panels and switchgear applications.