Space saving POWR-GARD 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 JLLN/JLLS fuses may prevent opening of
expensive semiconductor fuses protecting individual components.
