JLLS Series -
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,
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.
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