JLLS040 - 40Amp Fuse

JLLS040 - 40Amp Fuse

When your equipment specifies a 40-amp Class T fuse, the other ratings matter as much as the label number. The Littelfuse JLLS040 combines a 40A continuous current rating with fast-acting operation, current-limiting characteristics, and industrial cartridge construction.

Key Features and Benefits

• 40A continuous current rating: Clearly identifies the amperage for equipment requiring a 40-amp fuse.
• Class T fuse: Provides the specified fuse class for applications designed around a Class T configuration.
• Fast-acting opening: Manufacturer-designated Fast-Acting (F) operation provides another essential specification for matching the fuse to the equipment.
• Current-limiting characteristics: JLLS040 belongs to Littelfuse's current-limiting family style.
• 600VAC maximum voltage: Supports compatible AC applications within its stated maximum voltage.
• 300VDC maximum voltage: Also carries a defined DC voltage rating for compatible equipment.
• Industrial cartridge construction: Provides an important physical characteristic to confirm when checking fit and compatibility.
• Non-indicating: The fuse does not include an indicating function.

Technical Specifications

• Manufacturer: Littelfuse
  
• Catalog Number: JLLS040
  
• Series: JLLS
  
• Manufacturer Description: FUS 600V F/A CLASS T 40A
  
• Continuous Current Rating: 40A
  
• Fuse Class: Class T
  
• Opening Characteristic: Fast-Acting (F)
  
• Family Style: Current Limiting
  
• Maximum AC Voltage: 600VAC
  
• Maximum DC Voltage: 300VDC
  
• AC Interrupting Rating: 200,000A (200 kA) at 600VAC
  
• DC Interrupting Rating: 20,000A (20 kA) at 300VDC
  
• Size / Construction: Industrial Cartridge
  
• Indicating: No
  
• Mounting Method: Fuse Block / Clip / Holder
  
• PG Holder: LFT60060 Series
  

Material Compliance and Certifications

The supplied manufacturer information for the Littelfuse JLLS040 does not specify UL, CSA, CE, RoHS, REACH, or other certification or material-compliance details. That does not mean the product lacks any particular certification. If your installation requires an approval or material-compliance standard, verify the product markings and current authoritative manufacturer documentation before use.

Where It Works Best

The JLLS040 40A Class T fuse is a logical fit for compatible electrical equipment specifically requiring a 40A, fast-acting, current-limiting industrial cartridge fuse with matching voltage, interrupting, and mounting requirements. It is particularly useful in maintenance and replacement situations where the equipment documentation specifies JLLS040 or where the complete set of manufacturer-defined characteristics matches the original fuse requirements.