JLLN/JLLS POWR-T™ Class T Fuses
300/600 VAC • Fast-Acting • 1 – 1200 Amperes
Littelfuse Class T fuses can be used in applications that require fast-
acting protection, such as equipment containing variable speed drives,
rectifiers, and other surge-sensitive components. Main switches
containing Class T fuses may be used to provide protection to individual
electric services and meter stacks. Molded case circuit breaker load
centers and Panelboards also will have increased interrupting ratings
when “series rated” with Class T fuses.
Space-Saving – Switch enclosures, fuse pullouts, and other equipment
using Class T fuses are usually more compact. Typical three-pole Class
T fuse blocks require less than 50% of the panel space required by
similar Class R blocks.
Longer Equipment Life and Increased Safety – Class T fuses provide
fast, reliable protection against overcurrents up to 200,000 amperes.
Extremely current-limiting design minimizes the damaging heating and
magnetic effects caused by short-circuit currents.
Space saving POWR-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 ® , POWR-T fuses
provide fast acting overload and short-circuit protection for non-inductive
circuits and equipment. Used in inductive circuits, the ampere rating of
POWR-T fuses must be increased to prevent opening on in-rush currents.
In such instances, POWR-T fuses may provide only short-circuit protection.
Optional Mounting Types – In addition to the Class T dimensions,
Littelfuse offers select ratings with PC board mounting tabs for specialty
applications. PC board mount versions are UL Recognized. Contact the
factory for more information.
NOTE: JLLN Class T 300 volt fuses are UL Listed for circuits not
exceeding 300 volts to ground. However, since UL does not include
testing 300 volt Class T fuses on 277/480 volt three-phase bolted faults,
Littelfuse does not recommend using 300 volt Class T fuses where
phase-to-phase voltage exceeds 300 volts.
AC: 300 Volts (JLLN); 600 Volts (JLLS)
DC: 125 Volts (JLLN 1 – 30A)
160 Volts (JLLN 35 – 60A)
125 Volts (JLLN 110 – 1200A)
300 Volts (JLLS)
AC: 200,000 aperes rs syetrical
DC: 20,000 aperes
(JLLN 110 – 1200A)
(JLLS 1 – 1200A)
1– 1200 aperes
* JLLS only
Exaple part nuber (series & aperage): JLLS 100
AC: Standard 248-15, Class T
UL Listed (File No: E81895):
JLLN/JLLS (1 – 800A)
Recommended Fuse Blocks
UL Recognized (File No: E71611):
JLLS (900 – 1200A)
CSA Certified (File No: LR29862):
LT300 series (for JLLN series fuses)
LT600 series (for JLLS series fuses)
LSCR002 (for JLLN/JLLS 700-1200A fuses)
Refer to the Blocks and Holders section of this catalog for additional inforation.
JLLN/JLLS (1 – 600A)
DC: UL Listed (File No: E81895):
JLLN (110 – 1200A)
Littelfuse self-certified: JLLN 1-60A
JLLS (1 – 1200A)