Section Overview
Rely on Littelfuse for short circuit protection of telecommunications
circuits and sensitive DC power distribution circuits
Telecom products
Table of Contents
L17T Series Telecommunications Power Fuse..............................57
TLN Series Telecommunications Power Fuse............................. 58
TLS Series Telecommunications Power Fuse.............................. 59
Alarm Indicating Fuses................................................................. 60
LTFD 101 Series Telecommunications Disconnect Switch...........61
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56
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Fuses — Telecom Products
L17T Series Telecommunications Power Fuse
170 VDC • Current-Limiting • 70 -1200 Amperes
Ordering Information
70
80
90
ampere ratings
175
250
400
200
300
450
225
350
500
100
125
150
series
voltage
amperage
L17T
170
1200
600
800
900
Catalog
Number
L17T 1200
1000
1100
1200
System
Number
L17T1200V
Dimensions in inches (mm)
F
Ampere
Rating
Description
Specifically designed for short-circuit protection of
telecommunications circuits, the Littelfuse L17T series fuses
provide reliable protection of sensitive DC power distribution
systems. Constructed with silver plated elements for low
I2t and peak let-through, these advanced fuses virtually
eliminate equipment damage due to surges and spikes. The
L17T series fuse unique element geometry also provides
cooler running temperatures, helping to minimize heat within
enclosures.
H
A
B
C
D
E
Dimensions in Inches (mm)
C
D
E
F
A
B
G
H
70 – 250
1 5 ⁄32
(29.4)
1 7⁄ 8
(47.6)
2 3 ⁄16
(55.6)
2­ 21 ⁄32
(67.5)
1
(25.4)
78
⁄
(22.2)
5 16
⁄
(7.9)
⁄
(4.8)
300 – 800
11⁄4
(31.8)
1 15 ⁄16
(49.2)
2 9 ⁄16
(65.1)
3 1⁄ 2
(88.9)
11⁄2
(38.1)
1
(25.4)
13 32
⁄
(10.3)
14
⁄
(6.35)
900–1200
1 11 ⁄32
(34.0)
­—
­—
4 1⁄16
(103.1)
—
11⁄2
(38.1)
—
14
⁄
(6.35)
4 Telecom Fuses
G
3 16
Web Resources
For additional information, visit:
www.littelfuse.com/l17t
Features
Recommended Fuseholders
• Low I2t
LTFD 6001 and LTFD 1200 series–see website:
www.littelfuse.com/ltfd
• Extremely current-limiting
• Low operating temperature
• 170 VDC rating
Specifications
Voltage Rating:
170 VDC
Interrupting Rating:
100 kA
Ampere Range:
70 – 1200 A
Approvals:UL Recognized (File No. E71611)
CSA Recognized (File No. LR29862)
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Fuses — Telecom Products
TLN Series Telecommunications Power Fuse
170 VDC • Current-Limiting • 1-600 Amperes
Specifications
Voltage Rating:
170 VDC
Interrupting Rating:
100 kA
Ampere Range:
1 – 600 A
Approvals:UL Recognized (File No. E71611)
Ordering Information
Telecom Products 4
1
3
5
6
10
ampere ratings
40
80
150
45
90
175
50
100
200
60
110
225
70
125
250
15
20
25
30
35
series
voltage
amperage
TLN
170VDC
6
300
350
400
450
500
Catalog
Number
TLN006
600
—
—
—
—
System
Number
0TLN006.T
Replaces competitors’ TPN and TGN Series.
Description
The TLN Series fuses are specifically designed for the
protection of telecommunications DC power distribution
circuits.
Web Resources
For additional information, visit:
www.littelfuse.com/tln
Features
• 170 VDC rating
Recommended Fuseholders
• Fast-acting and current-limiting
LFR25 Series................................................................. pg. 90
• 1 to 600 amperes rating
• Dimensionally similar to 250 V Class R fuses
Dimensions in inches (mm)
F
G
A
A
K
D
B
E
C
B
H
F
D
J
C
FG 2
FG 1
Figure 1
Ampere Rating
1 – 30
35 – 60
Dimensions in Inches (mm)
A
2 (50.8)
3 (76.2)
B
12
⁄ (12.7)
3 4
⁄ (19.1)
C
12
⁄ (12.7)
58
⁄ (15.9)
D
9 16
⁄ (14.3)
13 16
⁄ (20.6)
A
5 7⁄8 (149.2)
7 1⁄8 (181.0)
8 5 ⁄8 (219.1)
10 3 ⁄8 (263.5)
B
1 (25.4)
11⁄2 (38.1)
2 (50.8)
2 1⁄2 (63.5)
C
11 ⁄16 (27.0)
115 ⁄32 (37.3)
115 ⁄16 (49.2)
2 3 ⁄8 (60.3)
D
11 ⁄16 (27.0)
119 ⁄ 32 (40.5)
2 3 ⁄ 32 (53.2)
2 19 ⁄32 (65.9)
E
⁄ (2.0)
3 32
⁄ (2.4)
5 64
F
⁄ (4.0)
3 16
⁄ (4.8)
5 32
G
⁄ (9.5)
5 8
⁄ (15.9)
H
—
—
G
11⁄4 (31.6)
1 27⁄32 (46.8)
2 11 ⁄ 32 (59.5)
2 27⁄ 32 (72.2)
H
⁄ (6.4)
7 16
⁄ (11.1)
5 8
⁄ (15.9)
3 4
⁄ (19.1)
3 8
J
—
—
K
—
—
Figure 2
Ampere Rating
70 – 100
110 – 200
225 – 400
450 – 600
www.littelfuse.com
Dimensions in Inches (mm)
⁄
3 16
⁄
14
⁄
14
⁄
18
58
E
(3.2)
(4.8)
(6.4)
(6.4)
F
⁄ (19.1)
11⁄8 (28.6)
15 ⁄ 8 (41.3)
2 (50.8)
3 4
14
⁄
9 32
⁄
13 32
⁄
17 32
⁄
9 32
J
(7.1)
(7.1)
(10.3)
(13.5)
K
⁄ (12.7)
11 16
⁄ (17.5)
15 16
⁄ (23.8)
11⁄ 8 (28.6)
12
© 2010 Littelfuse POWR-GARD® Products Catalog
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Fuses — Telecom Products
TLS Series Telecommunications Power Fuse
170 VDC • Current-Limiting • 1-125 Amperes
Specifications
Voltage Rating:
Interrupting Rating:
Ampere Range:
Approvals:
Construction: Body:
170 VDC
100 kA
1 – 125 A
UL Recognized (File No. E71611)
Caps: Silver-plated brass
Glass melamine
Ordering Information
6
10
15
20
ampere ratings
25
30
35
40
50
60
70
80
90
100
110*
125*
4 Telecom Fuses
1
2
3
5
*Available in cartridge only.
Note: To order leaded versions of TLS fuses, add suffix V, L, LB, or LS to part number.
Description
Littelfuse TLS Series fuses are designed specifically for
the protection of telecommunications equipment. TLS
fuses have been engineered to operate up to 170 VDC to
provide current-limiting short-circuit protection for cables
and components found in the DC power distribution circuits
of telecommunications systems. The compact design and
multiple mounting configurations of the TLS series allow it
to be used in a variety of applications.
series
voltage
amperage
TLS
170VDC
6
Catalog
Number
TLS006V
System
Number
0tLS006.TXV
Replaces competitors’ TPS and TGS Series.
Web Resources
For additional information, visit: www.littelfuse.com/tls
Features
Recommended Fuseholders
• 170 VDC rating
LTFD series disconnect switches...................................pg. 61
LFT30060 for TLS series cartridge style fuse.................pg. 95
Contact factory for more information.
• Current-limiting
• 1 to 125 amperes rating
• Multiple mounting configurations
• RoHS Compliant
Contact Littelfuse for characteristic curves. Dimensions for
reference only.
Dimensions in inches (mm)
TLS
TLS-V
TLS-L
.195
(4.953)
.37
(9.4)
.563
(14.3)
TLS-LS
.348
(8.839)
1.58
(40.132)
1.26
(32)
© 2010 Littelfuse POWR-GARD® Products Catalog
.944
(23.977)
.88 ± .06
(22.35 ± 1.52)
.032
(.813)
.74
(18.8)
Vertical Mount
.562
(14.275)
.28
(7.11)
1.367
(34.72)
1.74
(44.196)
.88
(22.35)
Cartridge
TLS-LB
Leaded
59
Bolt-In
Solder
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Fuses — Telecom Products
Telecommunications Power Fuses
Alarm Indicating Fuses
Ordering Information
Telecom Products 4
100 mA
150 mA
180 mA
10 Minute
Rating
100 mA
150 mA
180 mA
200 mA
250 mA
250 mA
350 mA
500 mA
750 mA
1.33 A
2A
3A
3.5 A
5A
8A
10 A
70 Series Alarm Indicating Fuses
Description
The 70 Series alarm indicating fuses are designed for use in
telecommunications equipment. A color coded tip provides
visual identification of the ampere rating and the fuse status.
Features
• Color coded tip
• Rated 125 VAC, 300 VDC
ampere ratings
500 mA
750 mA
1.33
Catalog
Number
70P
70R
70E
70X
70F
70K
70S
70G
70H
70A
70B
70C
70J
70D
70M
70N
System
Number
70P00000Z
70R00000Z
70E00000Z
70X00000Z
70F00000Z
70K00000Z
70S00000Z
70G00000Z
70H00000Z
70A00000Z
70B00000Z
70C00000Z
70J00000Z
70D00000Z
70M00000Z
70N00000Z
2
3
3.5
5
8
10
Color
Code
Grey/White
Red/White
Yellow
Black
Violet
Violet/White
Gray
Red
Brown
White
Orange
Blue
Black/White
Green/Black
Tan/White
Yellow/Purple
Web Resources
Specifications
Voltage Ratings:
Interrupting Ratings:
200 mA
250 mA
350 mA
For additional information, see website:
www.littelfuse.com/70
125 VAC
300 VDC
1,000 A @ 125 VAC
1,000 A @ 300 VDC
Ordering Information
/
1/5
1/4
18 100
/
1/2
65/100
3 8
ampere ratings
/
1 1/2
3
1
2
3 1/2
1/3
1/2
4
3 4
series
voltage
amperage
481
125 AC/DC
2
Catalog
Number
481002L
481 Series Alarm Indicating Fuses
Note: For 481 Dummy fuse, order 481000.
Description
Recommended Fuseholders
For telecommunications equipment and similar applications.
Color coded indicator flags indicate ampere rating. Body is
constructed of black polyphenylene sulfide with UL94-V0
flammability rating, contacts are of bright alloy-plated
beryllium copper. Available with or without protective lens.
12
15
20
System
Number
0481002.VXL
482 Series, see website: www.littelfuse.com/482
Available 1-20 pole with PCB or panel mounting.
To order with protective lens add suffix XL.
Web Resources
For additional information, see website:
www.littelfuse.com/481
Specifications
Voltage Rating:
125 VAC/DC
Approvals:UL Recognized
CSA Recognized
www.littelfuse.com
5
7 1/2
10
60
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Fuses — Telecom Products
LTFD 101 Series Telecommunications Disconnect Switch
80 VDC • 1-125 Amperes
Specifications
Voltage Rating:
Ampere Range:
Approvals:
80 VDC
1­ – 125 A
UL Recognized (File No. E122674)
Recommended Fuses
Littelfuse TLS Series fuses........................................... pg. 59
Ordering Information
series
amperage
Catalog
Number
System
Number
terminal
type
125 A Max
LTFD101-1
LTFD0101ZX1
Bullet
125 A Max
LTFD101-2
LTFD0101ZX2
Screw
LTFD
125 A Max
LTFD101-3
LTFD0101ZX3
Stud
LTFD
70 A Max
LTFD101-4
LTFD0101ZX4
CLIP
Web Resources
Description
4 Telecom Fuses
LTFD
LTFD
For additional information, visit:
www.littelfuse.com/ltfd101
Littelfuse compact LTFD 101 fuseholders for TLS fuses
are designed for quick installation into telecom equipment
panels. Their modular design fits into spaces originally
designed for circuit breakers and can be front panel
mounted or rear mounted using bullet connectors.
The innovative new pull-out design eliminates the
need for tools to replace fuses and includes an
alarm signaling circuit to identify the blown fuse.
Features
• Extremely compact
• Quick mounting
• Replaces circuit breakers
• Includes alarm signaling circuit
Dimensions in inches (mm)
6-32 NSER
0 75"
(19 05)
CL
3 75"
(95 25)
2 00"
(50 8)
0 305" (7 747) Dia
Bullet Terminal
0 85"
(21 59)
LOAD
2 50"
(63 5)
2 062"
(52 375)
1 940"
(49 276)
Alarm pin
0 02" ( 508) x 0 11" (2 794)
position optional
L NE
Dimensions for reference only. For additional options and dimensions, contact the factory.
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