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Littelfuse JLLS300 Powr-Gard® Class T Fast-Acting Fuse; 300 Amp, 600 Volt AC/300 Volt DC

  • Littelfuse JLLS300 Littelfuse JLLS300 Powr-Gard® Class T Fast-Acting Fuse; 300 Amp, 600 Volt AC/300 Volt DC
  • Littelfuse JLLS300 Powr-Gard® Class T Fast-Acting Fuse; 300 Amp, 600 Volt AC/300 Volt DC
Manufacturer: Littelfuse
Mfr. #: JLLS300
Item #: 7317
UPC: 079458190915
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Product Details

Size: 1 Inch x 1.563 Inch

Detailed Description: Littelfuse JLLS Powr-Gard® Class T Fast-acting fuse comes with an element window to visually inspect blown element and is rated at 300 Amps/600 VAC/300 VDC. Fuse offers a time-delay of minimum 10 seconds at 500% of rated current providing ultimate protection. It features blade ends and can be mounted on a holder with knife-blade termination. It is ideally used to provide protection to individual electric services and meter stacks. It measures 1 Inch x 1.563 Inch. Dual-element fuse can be used as a time-delay or a slow-blow fuse making it economical. Limits current for maximum short-circuit protection and reduced arc flash hazard.

Fuse offers low watt loss power consumption and its electrically isolated end caps provide additional safety. Also provides maximum protection to motors against burnout from overloads and single phasing. It can be holder mounted. It finds its application in lift trucks, scissor lifts, pallet Movers and low voltage battery powered equipment. Fuse is UL listed and CE/CSA certified.

Product Specification

Amperage Rating 300
Application Variable Speed Drives
Brand Littelfuse
Catalog Description JLLS UL CLASS T FAST-ACTING FUSE 300A. Space-saving Class T fuses are the most compact fuses available in ratings above 30 amperes ù less than one-third the size of comparable Class R fuses. When rated in accordance with the NEC, Class T fuses provide fast-acting overload and short circuit protection for non-inductive circuits and equipment. Used in inductive circuits, the ampere rating of Class T fuses must be increased to prevent opening on inrush currents. In such instances, Class T fuses may provide only short circuit protection.For motor and general purpose circuits where space is not critical, we recommend POWR-PROÖ JTD_ID Indicator series, LLNRK/LLSRK series, or FLSR_ID Indicator series. Applications: Protection of individual electric services and meters. Main switches containing Class T fuses may be used to provide compact protection for meter stacks. Molded case circuit breaker load centers and panelboards have increased interrupting ratings when ôseries ratedö with Littelfuse Class T fuses. Refer to panelboard manufacturersÆ literature for UL Listed combination of fuses and panelboards. Series ratings up to 200,000 amperes are available. Space Saving: Typical three-pole Class T fuse blocks require less than 50percent of the panel area required for Class R fuse blocks. Switch enclosures, fuse pullouts, and other equipment using Class T fuses are often correspondingly more compact. Safety: 200,000 A.I.R. ù Reliable interruption of all overcurrents up to 200,000 amperes. Extremely current limiting ù Stops damaging short circuit current faster than any mechanical protective device. Fast-Acting ù Provides fast-acting overload protection to equipment such as variable speed drives, rectifiers and other equipment containing surge-sensitive components. Longer Equipment Life: Current limiting design greatly reduces damage to equipment caused by heating and magnetic effects of short circuit currents. Economical: Extremely current limiting design often permits use of readily available, less costly equipment. Used as input or output fuses for surge-sensitive components, such as variable speed drives and rectifiers, fast-acting Class T JLLS fuses may prevent opening of expensive semiconductor fuses protecting individual components.


Height 1.7500
Height Unit IN
Interrupt Rating 200kA
Item Status A
Length 4.0000
Length UOM IN
Mfr. # JLLS300
Mounting Blade
Response Time Blade
Size 3.63L; 1.59D
Special Features Current-limiting
Standard 248-15 Class T
Type Class T
UNSPSC 39121627
Voltage Rating 600/300
Width 1.7500
Width UOM IN