Littelfuse JLLS040 Class T Fuse 40A 600VAC 300VDC Fast-Acting Industrial Cartridge

The Littelfuse JLLS Series fuses are expertly engineered for the protection of individual electric services and meters, ensuring that your electrical systems operate safely and reliably. With an impressive interrupting rating of up to 200,000 amperes, these fast-acting devices are designed to stop damaging short circuit currents more rapidly than traditional mechanical protective devices, thereby minimizing the risk of equipment damage. Their current limiting design is particularly advantageous for surge-sensitive applications, such as variable speed drives and rectifiers, where they can prevent costly failures of semiconductor components. Additionally, the compact design of Class T fuse blocks allows for efficient use of panel space, as they occupy less than 50% of the area required for larger Class R fuse blocks. This makes them an ideal choice for applications that demand both performance and space efficiency, including meter stacks and other compact enclosures. Whether used as input or output fuses, the JLLS040 offers reliable overload protection and a high level of performance to enhance the safety of your electrical systems.

• Stops damaging short circuit currents faster than mechanical devices
• Current limiting design reduces equipment damage from short circuits
• High interrupting rating up to 200,000 amperes
• Fast-acting overload protection for surge-sensitive components
• Reliable protection of individual electric services and meters
• Compact size occupying less than one-third the space of Class R fuses
• Suitable for 600V AC and up to 300V DC applications
• Optimized for variable speed drives, rectifiers, and meter stacks
• Melamine body with copper caps for electrical insulation and conductivity
• UL Listed Class T fuse meeting industrial power and safety standards

• Voltage: 600V AC, 300V AC, 300V DC, 125V DC
• Amperage Range: 1-1200A
• Interrupting Rating: 20000A @ 300V DC, 200 kA AC rms symmetrical, 20 kA DC
• Opening Speed: Fast-Acting (F)
• Ampere Rating: 40 A
• Material: Melamine body, copper caps
• Size: Less than one-third size of Class R fuses
• Country of Origin: Mexico

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