JLLS Series - UL Class T Fast-Acting Fuse

JLLS Fuses

Space-saving Class T fuses are the most compact fuses available in ratings above 30 amperes — 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-PRO™ 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 “series rated” with Littelfuse Class T fuses. Refer to panelboard manufacturers’ 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 50% 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. — Reliable interruption of all overcurrents up to 200,000 amperes.
  • Extremely current limiting — Stops damaging short circuit current faster than any mechanical protective device.
  • Fast-Acting — 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.

Access specifications, certifications, check availability and order parts below

Catalog #Amps (A)VAC (V)VDC (V)Interrupting RatingOpeningSizeStockSamplesCompare
JLLS001160030020000A@300VDCFast-Acting (F)Industrial CartridgeCheckOrder
JLLS002260030020000A@300VDCFast-Acting (F)Industrial CartridgeCheckOrder
JLLS003360030020000A@300VDCFast-Acting (F)Industrial CartridgeCheckOrder
JLLS006660030020000A@300VDCFast-Acting (F)Industrial CartridgeCheckOrder
JLLS0101060030020000A@300VDCFast-Acting (F)Industrial CartridgeCheckOrder
JLLS0151560030020000A@300VDCFast-Acting (F)Industrial CartridgeCheckOrder
JLLS0202060030020000A@300VDCFast-Acting (F)Industrial CartridgeCheckOrder
JLLS0252560030020000A@300VDCFast-Acting (F)Industrial CartridgeCheckOrder
JLLS0303060030020000A@300VDCFast-Acting (F)Industrial CartridgeCheckOrder
JLLS03535600300200000A@600VACFast-Acting (F)Industrial CartridgeCheckOrder
JLLS0404060030020000A@300VDCFast-Acting (F)Industrial CartridgeCheckOrder
JLLS0454560030020000A@300VDCFast-Acting (F)Industrial CartridgeCheckOrder
JLLS0505060030020000A@300VDCFast-Acting (F)Industrial CartridgeCheckOrder
JLLS0606060030020000A@300VDCFast-Acting (F)Industrial CartridgeCheckOrder
JLLS0707060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS0808060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS0909060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS10010060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS11011060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS12512560030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS15015060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS17517560030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS20020060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS22522560030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS25025060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS30030060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS35035060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS40040060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS45045060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS50050060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS60060060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS700700600300200000A@600VACFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS80080060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS90090060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS1000100060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS1100110060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder
JLLS1200120060030020000A@300VDCFast-Acting (F)Knife-Blade/Bolt-InCheckOrder

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