Littelfuse JLLS003 Class T Fast-Acting Fuse, 600VAC/300VDC, 3A

Littelfuse JLLS003 Class T Fast-Acting Fuse, 600VAC/300VDC, 3A

Littelfuse's JLLS Series Class T fuse delivers fast-acting overload and short-circuit protection in an extremely compact, current-limiting design, less than one-third the size of comparable Class R fuses. Rated 3A at 600VAC/300VDC with an Industrial Cartridge package size, this fuse is engineered for non-inductive circuits and equipment where panel space is limited. With an interrupting rating of 20,000A@300VDC, it provides reliable protection for individual electric services, meters, and surge-sensitive components such as variable speed drives and rectifiers.

Key Features

• Compact Class T Design: Industrial Cartridge package size, less than one-third the size of comparable Class R fuses, ideal for space-constrained panels and meter stacks.
• Ampere Rating: 3A rating suited for individual electric service and meter protection.
• Voltage Rating: 600VAC / 300VDC rating supports a wide range of industrial and commercial circuits.
• Fast-Acting Operation: Fast-Acting (F) opening characteristic provides quick overload protection for surge-sensitive components such as variable speed drives and rectifiers.
• Interrupting Rating: 20,000A@300VDC interrupting rating for reliable clearing of overcurrent conditions.
• Extremely Current-Limiting: Stops damaging short-circuit current faster than mechanical protective devices; Class T fuses are rated up to 200,000 A.I.R., reducing equipment damage from the heating and magnetic effects of short-circuit currents.
• Series Rated Compatibility: Increases the interrupting ratings of molded case circuit breaker load centers and panelboards when series rated with Littelfuse Class T fuses; refer to panelboard manufacturer literature for UL Listed combinations.

Certifications & Compliance

• UL Listed
• CSA Certified

Technical Specifications

• VAC (V): 600
• VDC (V): 300
• Ampere Rating (A): 3

Typical Applications

• Protection of Individual Electric Services and Meters
• Meter Stack Protection via Main Switches Containing Class T Fuses
• Input/Output Protection for Variable Speed Drives and Rectifiers
• Series-Rated Molded Case Circuit Breaker Panelboards
• Commercial and Industrial Electrical Panels

Why Littelfuse?

Littelfuse Class T fuses combine an extremely current-limiting, fast-acting design with a compact Industrial Cartridge package, giving electrical professionals reliable, code-compliant overcurrent protection without sacrificing panel space. Backed by UL Listing and CSA Certification, the JLLS Series is built for demanding commercial and industrial applications where dependable interruption performance is critical.