Littelfuse JLLN300 Class T Fuse – 300A – 300V Fast-Acting Current-Limiting Fuse

The Littelfuse JLLN300 is a 300 Amp Class T fast-acting fuse designed for superior protection in industrial and commercial electrical distribution systems. Part of the JLLN series, this current-limiting fuse responds rapidly to fault conditions, reducing let-through energy and minimizing equipment damage. Its compact knife-blade/bolt-in design makes it ideal for applications requiring high interrupting capacity, fast fault clearing, and space-efficient installation.

Electrical Rating

• Current Rating: 300 Amps
• Maximum AC Voltage: 300 VAC
• Maximum DC Voltage: 125 VDC
• Interrupting Rating:
  • 200 kA AC
  • 20 kA DC @ 125 VDC

Key Specifications

• Manufacturer: Littelfuse
• Catalog Number: JLLN300
• Series: JLLN
• Fuse Class: Class T
• Construction Type: Knife-Blade / Bolt-In
• Fuse Type: Fast-Acting Current-Limiting
• Indicating: No

Protection Characteristics

• Fast-acting operation for rapid fault interruption
• Current-limiting design reduces fault energy and equipment stress
• Provides exceptional short-circuit protection
• High interrupting capacity for demanding electrical systems
• Helps safeguard sensitive electrical and electronic equipment

Construction Features

• Compact Class T fuse design
• Knife-blade/bolt-in terminal construction
• Non-indicating fuse configuration
• Industrial-duty construction for long service life and dependable performance

Mounting & Compatibility

• Mounting Method: Fuse Block / Holder / Bolt-In Mounting
• Compatible with Class T fuse blocks and fuse holders
• Suitable for switchboards, panelboards, UPS systems, and industrial distribution equipment

Applications

• Industrial power distribution systems
• UPS and battery backup systems
• Switchboards and panelboards
• Motor control centers
• Current-limiting feeder and branch circuit protection
• Protection of sensitive electrical and electronic equipment

Product Data

• Manufacturer: Littelfuse
• Catalog Number: JLLN300
• Product Type: Fast-Acting Current-Limiting Fuse
• Series: JLLN
• Fuse Class: Class T

Returns are easy

You may return items within 30 days of delivery for a refund.

FREE Shipping on orders over $149.

My Circuit Breakers offers one to five day delivery in the United States. The variation depends on the chosen shipping speed and the warehouse location for the product(s).

Same Day Shipping

We strive to ship out your items within one business day.

In rare circumstances, My Circuit Breakers may reserve up to 5 business days to complete shipment. Feel free to contact us if your order is time sensitive.

My Circuit Breakers provides a comprehensive 1-year warranty on both new and reconditioned products. Rest assured, all products are authentic OEM (original equipment manufacturer). Extended warranties are available upon request.