AJT300 – Mersen | CLASS J TD 600V 300A

Description

The Mersen AJT300 is a Class J time-delay fuse designed for high-current applications. This fuse offers robust protection for circuits while being compact and efficient compared to traditional fuse options.

Key Features

• Visual Indication: Available in non-indicating or SmartSpot visual open fuse indicator versions for easy detection of fuse status.
• Time-Delay Function: Time-delay capability allows the fuse to manage motor starting and transformer inrush currents, reducing nuisance blows.
• Current-Limiting: Provides high current-limiting performance to manage low peak let-thru currents effectively.
• Interrupting Rating: Features a 300kA interrupting rating, supported by self-certification and UL witnessed tests.
• Compact Design: Requires less mounting space than 600VAC Class RK fuses, enabling the use of smaller and more economical fuse blocks.
• Arc Flash Reduction: Recommended for reducing arc flash energy, enhancing operational safety.
• Selectivity: Facilitates easy 2-to-1 selectivity to prevent unwanted shutdowns.
• Dimensional Integrity: Unique Class J dimensions help avoid replacement errors.
• Durable Construction: High-visibility orange label for quick brand recognition, with metal-embossed date and catalog number for traceability.
• Robust Material: Constructed with a fiberglass body and high-grade silica filler for stability in harsh environments and effective arc quenching.
• Optional Indicator: Optional EI indicator/switch mount available for AJT70 to 600 for open fuse indication.

Specifications

• Manufacturer Part Number: AJT300
• Voltage Rating (AC): 600 V
• Ampere Rating: 300 A
• Fuse Class: Class J
• Interrupting Rating: 300kA
• Body Material: Fiberglass with high-grade silica filler
• Standards Approvals:
  • UL listed to standard 248-8
  • DC listed to UL standard 248
  • CSA certified to standard C22.2 No. 248.8
  • IEC 60269-2-1
• Applications:
  • Motor circuits
  • Mains
  • Feeders
  • Branch circuits
  • Lighting, heating, and general loads
  • Transformers
  • Control panels
  • Circuit breaker back-up
  • Bus duct
  • Load centers

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