General Purpose Fuses
General Purpose Fuses
26 www.littelfuse.com © 2005 Littelfuse • POWR-GARD™ Products Catalog
KLLU series UL Listed, time-delay, Class L fuses are quality fuses,
developed to provide a somewhat lower priced alternate to the
POWR-PRO® KLPC series fuses. KLLU series fuses meet or exceed
all UL requirements for Class L fuses. For superior protection and
performance, specification-grade POWR-PRO KLPC series fuses are
the recommended fuse. Complete information on KLPC fuses may
be found in the POWR-PRO Fuse section of this catalog.
Applications
Service switches
Switchboard mains and feeders
Bolted pressure contact switches
Motor control center mains
Large motor branch circuits
UL Listed series rated protection for molded case circuit breaker
panelboards and loadcenters. See panelboard manufacturers’
literature for recommended fuse rating.
Safety
• 200,000 A.I.R. — Provides reliable interruption of all overcurrents up
to 200,000 amperes.
• When used for motor branch circuit protection, KLLU fuses may be
sized close to the motor full load current, providing excellent protection
to branch circuit conductors, motor control equipment and motors.
Longer Equipment Life
• Current-Limiting — Reduces short-circuit damage to systems and
equipment.
• Reduced downtime.
• Ten second minimum time-delay at 500% current eliminates
needless downtime caused by heavy starting currents of large
motors and other inductive loads.
• Selective coordination — KLLU fuses coordinate well with other
Class L fuses and with all current-limiting Littelfuse fuses rated 600
amps or less. This means less time spent trying to locate short-
circuits or overloaded equipment, because only the fuse immediately
on the line side of the affected circuit opens.
Easy To Use
• 200,000 A.I.R. rating minimizes need for short-circuit calculations,
while meeting present and future system requirements.
• KLLU fuse time-current characteristics closely match typical time-
current curves of circuit breakers. Although fuse/circuit breaker systems
can seldom be 100% coordinated, KLLU series fuses permit use of a
wider range of breaker setting than fast acting Class L fuses.
Excellent protection for a single breaker or a group of breakers.
KLLU Class L Fuses
600 VAC • Time-Delay • 601 – 4000 Amperes
Specifications
Voltage Ratings: AC: 600 Volts
DC: Contact factory
Interrupting Ratings: 200,000 amperes rms symmetrical
Ampere Range: 601 – 4000 amperes
Approvals: Standard 248-10, Class L
UL Listed (File No: E81895)
CSA Certified (File No: LR29862)
Ampere Ratings
601 750 1000 1400 1800 3000
650 800 1200 1500 2000 3500
700 900 1350 1600 2500 4000
Example part number (series & amperage): KLLU 1000
General Purpose Fuses
General Purpose Fuses
27
www.littelfuse.com
© 2005 Littelfuse • POWR-GARD™ Products Catalog
KLLU Class L Fuses
600 VAC • Time-Delay • 601 – 4000 Amperes
B
C
J
F
M
FIG.1
AABC
J
D E F
N
M
FIG.2
D E F
ABC
G
H
N
M
J
FIG. 3
N
MG
D E F
ABC
H
J
FIG. 4
K
L
Amperes Fig.
No.
Dimensions In Inches (mm in parentheses)
A B C D E F G H J K L M N
601 – 800 133⁄4
(95.3)
53⁄4
(146.1)
63⁄4
(171.5) — —85⁄8
(219.1) — — 2
(50.8)
21⁄2
(63.5)
3⁄8
(9.5)
5⁄8 x 11⁄8
(15.9) x (28.6)
—
801 – 1200 233⁄4
(95.3)
53⁄4
(146.1)
63⁄4
(171.5)
91⁄4
(235.0)
91⁄2
(241.3)
103⁄4
(273.1) — — 2
(50.8)
21⁄2
(63.5)
3⁄8
(9.5)
5⁄8 x 3⁄4
(15.9) x (19.1)
5⁄8 x 11⁄8
(15.9) x (28.6)
1201 – 1600 233⁄4
(95.3)
53⁄4
(146.1)
63⁄4
(171.5)
91⁄4
(235.0)
91⁄2
(241.3)
103⁄4
(273.1) — — 23⁄8
(60.3)
3
(76.2)
7⁄16
(11.1)
5⁄8 x 3⁄4
(15.9) x (19.1)
5⁄8 x 11⁄8
(15.9) x (28.6)
1601 – 2000 233⁄4
(95.3)
53⁄4
(146.1)
63⁄4
(171.5)
91⁄4
(235.0)
91⁄2
(241.3)
103⁄4
(273.1) — — 23⁄4
(69.9)
31⁄2
(88.9)
1⁄2
(12.7)
5⁄8 x 3⁄4
(15.9) x (19.1)
5⁄8 x 11⁄8
(15.9) x (28.6)
2001 – 2500 34
(101.6)
53⁄4
(146.1)
63⁄4
(171.5)
91⁄4
(235.0)
91⁄2
(241.3)
103⁄4
(273.1)
15⁄8
(41.3)
13⁄4
(44.5)
31⁄2
(88.9)
5
(127.0)
3⁄4
(19.1)
5⁄8 x 3⁄4
(15.9) x (19.1)
5⁄8 x 11⁄8
(15.9) x (28.6)
2501 – 3000 34
(101.6)
53⁄4
(146.1)
63⁄4
(171.5)
91⁄4
(235.0)
91⁄2
(241.3)
103⁄4
(273.1)
15⁄8
(41.3)
13⁄4
(44.5)
4
(101.6)
5
(127.0)
3⁄4
(19.1)
5⁄8 x 3⁄4
(15.9) x (19.1)
5⁄8 x 11⁄8
(15.9) x (28.6)
3001 – 4000 44
(101.6)
53⁄4
(146.1)
63⁄4
(171.5)
91⁄4
(235.0)
91⁄2
(241.3)
103⁄4
(273.1)
13⁄4
(44.5)
31⁄4
(82.6)
43⁄4
(120.7)
53⁄4
(146.1)
3⁄4
(19.1)
5⁄8 x 13⁄8
(15.9) x (34.9)
5⁄8 x 13⁄8
(15.9) x (34.9)
General Purpose Fuses
General Purpose Fuses
28 www.littelfuse.com © 2005 Littelfuse • POWR-GARD™ Products Catalog
KLLU Class L Fuses
600 VAC • Time-Delay • 601 – 4000 Amperes
1000
800
600
400
300
200
100
80
60
40
30
20
10
8
6
4
3
2
1
.8
.6
.4
.3
.2
.1
.08
.06
.04
.03
.02
.01
2000
3000
4000
6000
8000
10000
20000
30000
40000
60000
80000
100000
200000
300000
400000
600000
800000
1000000
80
100
200
300
400
600
800
1000
50
601A
800A
1200A
1600A
2000A
3000A
3500A
4000A
TIME IN SECONDS
CURRENT IN AMPERES
565001
SYMMETRICAL R.M.S. AMPERES
AVAILABLE FAULT CURRENT
PEAK LET-THRU IN AMPERES
800A
1200A
1600A
2000A
3000A
4000A
10000000
1000000
100000
10000
1000
1000
100
200000
100000
10000
Current-Limiting Effects of KLLU (600V) fuses
Short-Circuit Current* Apparent RMS Symmetrical Current for Various Fuse Ratings
800A 1200A 1600A 2000A 3000A 4000A
5,000 5,000 5,000 5,000 5,000 5,000 5,000
10,000 10,000 10,000 10,000 10,000 10,000 10,000
15,000 11,900 15,000 15,000 15,000 15,000 15,000
20,000 13,000 18,500 20,000 20,000 20,000 20,000
25,000 14,000 20,000 25,000 25,000 25,000 25,000
30,000 14,500 21,000 26,500 30,000 30,000 30,000
35,000 15,000 22,000 28,500 34,000 35,000 35,000
40,000 16,000 23,000 30,000 35,000 37,000 40,000
50,000 17,000 24,000 32,000 38,000 39,000 44,000
60,000 18,000 26,000 34,000 42,000 43,000 50,000
80,000 19,000 28,000 36,000 44,000 46,000 54,500
100,000 21,000 30,000 38,000 46,000 48,000 57,500
150,000 24,000 35,000 44,000 50,000 51,000 68,000
200,000 26,000 38,000 48,000 53,000 60,000 74,000
* Prospective RMS Symmetrical Amperes Short-Circuit Current
Note: Data Derived from Peak Let-Thru Curves
