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JLLN/JLLS POWR-T™ Class T Fuses
300/600 VAC • Fast-Acting • 1 – 1200 Amperes
Applications
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.
Features/Benefits
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.
Specifications
Ampere Ratings
Voltage Ratings:
AC: 300 Volts (JLLN); 600 Volts (JLLS)
1
30
90
250
800
DC: 125 Volts (JLLN 1 – 30A)
2
35
100
300
900*
160 Volts (JLLN 35 – 60A)
3
40
110
350
1000
125 Volts (JLLN 110 – 1200A)
6
45
125
400
1100
300 Volts (JLLS)
10
50
150
450
1200
Interrupting Ratings:
AC: 200,000 a­peres r­s sy­­etrical
15
60
175
500
DC: 20,000 a­peres
20
70
200
600
(JLLN 110 – 1200A)
25
80
225
700
(JLLS 1 – 1200A)
Ampere Range:
1– 1200 a­peres
* JLLS only
Exa­ple part nu­ber (series & a­perage): JLLS 100
Approvals:
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)