JLLN250 - 250Amp Fuse

JLLN250 - 250Amp Fuse

When your equipment calls for a 250-amp Class T fuse, a good compatibility check goes beyond the number printed on the fuse. The Littelfuse JLLN250 combines a 250A continuous current rating with fast-acting operation, a current-limiting design, and knife-blade/bolt-in construction. When the application requires these exact specifications, the JLLN250 is a straightforward electrical component built to last when properly selected, installed, and operated within its stated ratings.

Key Features and Benefits

• 250A continuous current rating: Clearly defined for equipment requiring a 250-amp fuse.
• Class T configuration: Provides an important compatibility checkpoint when replacing or identifying an existing fuse.
• Fast-acting opening: Littelfuse specifies the JLLN250 as Fast-Acting (F).
• Current-limiting design: Gives you another manufacturer-defined characteristic to match against the application's requirements.
• 300VAC maximum voltage: Rated for compatible AC applications up to 300 volts.
• 125VDC maximum voltage: Also carries a defined DC rating up to 125 volts.
• Knife-blade/bolt-in construction: Provides a distinct physical configuration that should match the equipment and mounting arrangement.
• Non-indicating design: The JLLN250 does not incorporate an indicating feature.

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: JLLN250
  
• Series: JLLN
  
• Manufacturer Description: FUS 300V F/A CLASS T 250A
  
• Continuous Current Rating: 250A
  
• Fuse Class: Class T
  
• Opening Characteristic: Fast-Acting (F)
  
• Family Style: Current Limiting
  
• Maximum AC Voltage: 300VAC
  
• Maximum DC Voltage: 125VDC
  
• AC Interrupting Rating: 200,000A (200 kA) at 300VAC
  
• DC Interrupting Rating: 20,000A (20 kA) at 125VDC
  
• Size / Construction: Knife-Blade/Bolt-In
  
• Indicating: No
  
• Mounting Method: Fuse Block / Clip / Holder
  
• PG Holder: LFT30400 Series
  

Material Compliance and Certifications

The manufacturer data supplied for the JLLN250 did not include specific UL, CSA, CE, RoHS, REACH, or other certification or material-compliance information. This should not be interpreted as meaning the fuse lacks any particular certification. If a specific approval or material-compliance requirement applies to your equipment or installation, verify it against current authoritative Littelfuse documentation and the markings on the fuse.

Where It Works Best

The Littelfuse JLLN250 250A Class T fuse is best suited to compatible electrical equipment specifically designed for a 250A, fast-acting, current-limiting Class T fuse with knife-blade/bolt-in construction. It is particularly easy to evaluate when equipment documentation provides the required fuse class, amperage, voltage, interrupting capacity, and physical mounting information. For AC applications, the relevant specifications are 300VAC maximum and 200 kA interrupting capacity at 300VAC. For DC applications, they are 125VDC maximum and 20 kA interrupting capacity at 125VDC.