300 V • 600 V
Specifications
Voltage Ratings 300 V/600 V
Ampere Ratings 0–600 A
Leakage Current <0.6 mA at 600 V
Withstand Rating 200 kA RMS SYM
Materials:
Base Thermoplastic
Fuse Clip Tin plated copper alloy
Box Lug Aluminum
Fuse Studs Zinc plated steel
Pressure Plate Zinc plated steel
Screw Zinc plated steel
Flammability Rating UL 94 V-0
Approvals UL Listed (File: E14721)
CSA Certified (File: LR7316)
Environmental RoHS Compliant, Lead (Pb) Free
Recommended Fuses
300 V JLLN
600 V JLLS
Web Resources
Sample requests, downloadable CAD drawings and other
technical information:
Littelfuse.com/lft
Littelfuse.com/fuseblocks
Description
The Littelfuse Class T fuse blocks offer many advantages
such as space saving design, universal mounting holes,
snap-to-release DIN rail mounts and available covers.
Features/Benefits
Space-saving design
Universal mounting holes for easy replacement
One hand release from DIN rail for 30–60 A fuses
Reinforced fuse clips are standard
Covers available for most amperages to enhance safety
Ordering Information
(Class T 600 V)
AMP
RATING
ORDERING NUMBER
TORQUE WIRE
RANGE
WIRE
TYPE
BASE TEMP
RATING
DIN RAIL
MOUNT
COVER
ORDERING
NUMBER*
BASE
ORDERING
NUMBER
POLES TERMINAL SUFFIX
123BOX
LUG
PRES SURE
PLATE SCREW
30 LFT60030 1 2 3 C P S 5.6 N-m (50 in-lbs) 2–4 AWG † see
note
Solid/Stranded
125˚C • LFT60030FBC
2.8 N-m (25 in-lbs) 6–14 AWG
60 LFT60060 1 2 3 C — — 5.6 N-m (50 in-lbs) 2–4 AWG
CU-AL
125˚C • LFT60060FBC
2.8 N-m (25 in-lbs) 6–14 AWG
100 LFT60100 1 — 3 CS — —
13.6 N-m (120 in-lbs) 2/0–6 AWG
130˚C — LT60100FBC4.5 N-m (40 in-lbs) 8 AWG
4.0 N-m (35 in-lbs) 10–14 AWG
200 LFT60200 1 — 3 CS — — 31.1 N-m (275 in-lbs) 250 kcmil-6 130˚C — LT60200FBC
400 LFT60400 1 — 3 CS — — (2) 31.1 N-m (275 in-lbs) 250 kcmil-6 130˚C — LT60400FBC
600 LFT60600 1 — 3 CS — — (2) 42.4 N-m (375 in-lbs) 500 kcmil-6 130˚C — LT60600FBC
* Covers sold individually. One cover needed for each pole.
† Wire type for pressure plate and screw terminal is CU only
Ordering Information
(Class T 300 V)
AMPERE
RATING
ORDERING NUMBER
TORQUE WIRE
RANGE
WIRE
TYPE
BASE TEMP
RATING
DIN RAIL
MOUNT
COVER
ORDERING
NUMBER*
BASE
ORDERING
NUMBER
POLES TERMINAL SUFFIX
123BOX
LUG
PRES SURE
PLATE SCREW
30 LFT30030 1 2 3 C — — 5.6 N-m (50 in-lbs) 2–4 AWG
CU-AL
Solid/Stranded
125 ˚C • LFT30030FBC
2.8 N-m (25 in-lbs) 6–14 AWG
60 LFT30060 1 2 3 C — — 5.6 N-m (50 in-lbs) 2–4 AWG 125 ˚C • LFT30060FBC
2.8 N-m (25 in-lbs) 6–14 AWG
100 LFT30100 1 — 3 CS — —
13.6 N-m (120 in-lbs) 2/0–6 AWG
130 ˚C —LFT30100FBC4.5 N-m (40 in-lbs) 8 AWG
4.0 N-m (35 in-lbs) 10–14 AWG
200 LFT30200 1 — 3 CS — — 31.1 N-m (275 in-lbs) 250 kcmil-6 130 ˚C ——
400 LFT30400 1 — 3 CS — — (2) 31.1 N-m (275 in-lbs) 250 kcmil-6 130 ˚C ——
600 LFT30600 1 — 3 CS — — (2) 42.4 N-m (375 in-lbs) 500 kcmil-6 130 ˚C ——
POWR-GARD® Blocks & Holders
LF SERIES CLASS T FUSE BLOCKS
Littelfuse.com/lft
© 2019 Littelfuse, Inc.
Rev: 091819
1 of 5
Dimensions mm (inches)
21.8 [.86]
71.1
[2.80]
3.7 [.15]
TYP.
35.6
[1.40]
6.9 [.27]
40.9 [1.61]
15.0 [.59]
25.9 [1.02] 44.9 [1.77]
59.9 [2.36] 35.6 [1.40]
Ø4.5 [.18]
300 V 30 A
73.7
[2.90]
4.5 [.18]
24.6 [.97]
36.8
[1.45]
8.2 [.32]
16.4 [.65]
46.9 [1.85]
30.5 [1.20]
69.1 [2.72]
52.7 [2.07]
41.9 [1.65]
Ø4.5 [.18]
TYP.
34.8 [1.37]
133.4
[5.25]
7.9 [.31]
17.4 [.69]
66.7
[2.63]
104.6 [4.12]
R3.2 [.13]
TYP.
17.4 [.69] 15.9 [.63]
47.6 [1.88]
7.9 [.31]
9.5 [.38]
26.9 [1.06]
26.0 [1.03]
42.8 [1.69]
Ø.2 THRU
Ø.4 .5
Ø.2 THRU
Ø.4 .5
Ø.2 THRU
Ø.5 .4
300 V 60 A
300 V 100 A
POWR-GARD® Blocks & Holders
LF SERIES CLASS T FUSE BLOCKS
Littelfuse.com/lft
© 2019 Littelfuse, Inc.
Rev: 091819
2 of 5
38.1 [1.50]
177.8
[7.00]
19.1 [.75]
9.5 [.38]
114.3 [4.50]
R3.6 [.14]
TYP.
15.9 [.63]
57.2 [2.25]
168.3
[6.63]
88.9
[3.50]
9.5 [.38]
22.2 [.88]
92.1 [3.63]
Ø.3 THRU
Ø.5 .5
206.2
[8.12]
57.2 [2.25]
9.5 [.38]
28.6 [1.13]
171.5 [6.75]
15.9 [.63]
60.6 [2.38]
12.7 [.50]
103.1
[4.06]
85.7 [3.38]
127.0 [5.00]
Ø.3 THRU
Ø.5 .5
Ø.3 THRU
Ø.6 .5
Dimensions mm (inches)
222.3
[8.75]
69.9 [2.75]
8.8 [.35]
9.5 [.38]
209.6 [8.25]
60.3 [2.38]
15.9 [.63]
74.4 [2.93]
213.5
[8.41]
60.3 [2.38]
54.0 [2.13]
79.4 [3.13]
111.1
[4.38]
Ø.3 THRU
Ø.8 .5
Ø.3 THRU
Ø.5 .5
POWR-GARD® Blocks & Holders
LF SERIES CLASS T FUSE BLOCKS
300 V 200 A
300 V 400 A
300 V 600 A
Littelfuse.com/lft
© 2019 Littelfuse, Inc.
Rev: 091819
3 of 5
Dimensions mm (inches)
39.9 [1.57]
72.3
[2.85]
3.7 [.15]
9.5 [.38]
36.2
[1.42]
76.1 [3.00]
45.7 [1.80]
112.3 [4.42]
81.9 [3.23]
54.0 [2.13]
89.7
[3.53]
7.6 [.30]
24.6 [.97]
17.0 [.67]
R2.9 [.11]
TYP.
46.9 [1.85]
29.8 [1.17]
44.8
[1.77]
69.1 [2.72] 41.9 [1.65]
52.0 [2.05]
34.8 [1.37]
153.9 [6.06]
9.5 [.38]
17.5 [.69]
77.0 [3.03]
104.6 [4.12]
7.9 [.31] 15.9 [.63]
47.6 [1.88]
7.9 [.31] 26.0 [1.03]
42.8 [1.69]
77.0
[3.03]
R3.2 [.13]
TYP.
Ø.3 THRU
Ø.5 .4
Ø.2 THRU
Ø.4 .5
POWR-GARD® Blocks & Holders
LF SERIES CLASS T FUSE BLOCKS
600 V 30 A
600 V 60 A
600 V 100 A
Littelfuse.com/lft
© 2019 Littelfuse, Inc.
Rev: 091819
4 of 5
Dimensions mm (inches)
38.1 [1.50]
196.9 [7.75]
9.5 [.38]
19.1 [.75]
114.3 [4.50]
9.5 [.38]
98.4 [3.88]
15.9 [.63]
57.2 [2.25]
19.1 [.75]
Ø.3 THRU
Ø.6 .5
Ø.3 THRU
Ø.5 .5
57.2 [2.25]
228.6 [9.00]
9.5 [.38]
28.6 [1.13]
12.7 [.50]
114.3 [4.50]
171.5 [6.75]
15.9 [.63]
60.3 [2.38]
85.7 [3.38]
127.0 [5.00]
44.5 [1.75]
Ø.3 THRU
Ø.5 .5
Ø.3 THRU
Ø.6 .5
69.9 [2.75]
2
47.7 [9.75]
9.5 [.38] 9.5 [.38]
209.6 [8.25]
60.3 [2.38]
123.8 [4.88]
15.9 [.63]
74.4 [2.93]
54.0 [2.13]
79.4 [3.13]
130.2 [5.13]
60.3 [2.38]
149.2 [5.88]
Ø.3 THRU
Ø.8 .5
Ø.3 THRU
Ø.5 .5
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own
applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/product-disclaimer.
POWR-GARD® Blocks & Holders
LF SERIES CLASS T FUSE BLOCKS
600 V 200 A
600 V 400 A
600 V 600 A
Littelfuse.com/lft
© 2019 Littelfuse, Inc.
Rev: 091819
5 of 5
