JLLS Series Fuses

JLLS Series Fuses

UL Class T Fast-Acting Fuse

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, Littelfuse recommends POWR-PRO™ JTD_ID Indicator series or FLSR_ID Indicator series.

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Product Highlights

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.

Common Applications

• Variable speed drives
• Power conversion devices (inverters, rectifiers, UPS)
• Power supplies and power distribution units
• Compact main switches
• Individual electric services and meters

Available Products

Product 🔼 Description 🔼 Price 🔼 Amperage 🔼 Actions
JLLS200 200A 600V Fast Non-ID Class T Fuse $71.29 200A View
JLLS060 60A 600V Fast Non-ID Class T Fuse $30.28 60A View
JLLS040 40A 600V Fast Non-ID Class T Fuse $36.57 40A View
JLLS030 30A 600V Fast Non-ID Class T Fuse $20.27 30A View
JLLS020 20A 600V Fast Non-ID Class T Fuse $24.02 20A View
JLLS010 10A 600V Fast Non-ID Class T Fuse $22.50 10A View

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