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POWR-GARD® Blocks and Holders Datasheet
1 of 6 © 2016 Littelfuse POWR-GARD® Products
Rev: 4-A-012516
LF SERIES CLASS H/K5 AND R FUSE BLOCKS
250 V • 600 V
Description
The Littelfuse Class H/K5 and R blocks offer many benefits
such as indication, snap-to-release DIN rail mounting and
universal mounting holes. Class H and Class R fuse blocks
are dimensionally the same, but Class R blocks incorporate
a rejection feature, which only allows Class R fuses to
be inserted.
Features/Benefits
• Universal mounting holes for easy replacement
• Indication offered on most 250 V and 600 V versions
• One hand release from DIN rail for ferrule style fuses
• Reinforced fuse clips are standard on all Class H and
Class R fuse blocks
• Covers available for 100 A and lower to enhance safety
Specifications
Voltage Rating 250 V, 600 V
Ampere Ratings 0-600 A
Leakage Current <0.6 mA at 600 V
Withstand Rating Class H: 10 kA RMS SYM
Class R: 200 kA RMS SYM
Flammability Rating UL94 V-0
Approvals UL Listed (File: E14721)
CSA Certified (File: LR7316)
Environmental RoHS Compliant, Lead (Pb) Free
Web Resources
Sample requests, downloadable CAD drawings and other
technical information: littelfuse.com/lfh
littelfuse.com/lfr
Recommended Fuses
Class H/K5 Blocks – 250 V
NLN
Class R Blocks – 250 V
FLNR/FLNR_ID, KLNR, LLNRK
Class H/K5 Blocks – 600 V
NLS
Class R Blocks – 600 V
FLSR/FLSR_ID, KLSR, LLSRK/LLSRK_ID, IDSR
Ordering Information (Class H 250 V)
AMP
RATING
POLES
ORDERING NUMBER
TORQUE
TERMINAL
WIRE
RANGE WIRE TYPE
BASE
TEMP
RATING
DIN
RAIL
INDICATION
COVER
ORDERING
NUMBER*
BASE PART
NUMBER
SUFFIX
BOX
LUG
PRES SURE
PLATE SCREW
30
1 LFH250301 C P S
2.8 N-m (25 in-lbs)
C 6-14 AWG
CU Only
Solid/
Stranded
125˚C • — LFH25030FBC2 LFH250302 C P S P 10-14 AWG
3 LFH250303 C P S S 10-22 AWG
60
1 LFH250601 CID — — 5.6 N-m (50 in-lbs) 2-4 AWG CU-AL 125˚C • • LFH25060FBC2 LFH250602 CID — — 2.8 N-m (25 in-lbs) 6-14 AWG
3 LFH250603 CID — —
100 1 LFH251001 CID — — 13.6 N-m (120 in-lbs) 2/0-6 AWG
CU-AL 130˚C — • LFH25100FBC4.5 N-m (40 in-lbs) 8 AWG
3 LFH251003 CID — — 4.0 N-m (35 in-lbs) 10-14 AWG
200 1 LFH252001 C — — 31.1 N-m (275 in-lbs) 250 kcmil-6 CU-AL 130˚C — — —
3 LFH252003 C — —
400 1 LFH254001 C — — 31.1 N-m (275 in-lbs) (2) 350 kcmil-1/0 CU-AL 130˚C — — —
3 LFH254003 C — —
600 1 LFH256001 C — — 42.4 N-m (375 in-lbs) (2) 500 kcmil-4 CU-AL 130˚C — — —
3 LFH256003 C — —
Note: Reinforcing springs standard on all Class H fuse blocks. *Covers sold individually. One cover needed for each pole.
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POWR-GARD® Blocks and Holders Datasheet
2 of 6 © 2016 Littelfuse POWR-GARD® Products
Rev: 4-A-012516
LF SERIES CLASS H/K5 AND R FUSE BLOCKS
Note: Reinforcing springs standard on all Class H fuse blocks.
Note: Reinforcing springs standard on all Class R fuse blocks.
Note: Reinforcing springs standard on all Class R fuse blocks. *Covers sold individually. One cover needed for each pole.
Ordering Information (Class H 600 V)
AMP
RATING
POLES
ORDERING NUMBER
TORQUE
TERMINAL
WIRE
RANGE WIRE TYPE
BASE
TEMP
RATING
SNAP
TO
RELEASE
INDICATION
COVER
ORDERING
NUMBER*
BASE
ORDERING
NUMBER
SUFFIX
BOX
LUG
PRES SURE
PLATE SCREW
30
1LFH600301 CID PID SID
2.8 N-m (25 in-lbs)
C 6-14 AWG
CU Only
Solid/
Stranded
130˚C • • LFH60030FBC2 LFH600302 CID PID SID P 10-14 AWG
3 LFH600303 CID PID SID S 10-22 AWG
60
1 LFH600601 CID — — 5.6 N-m (50 in-lbs) 2-4 AWG CU-AL 130˚C • • LFH60060FBC2 LFH600602 CID — — 2.8 N-m (25 in-lbs) 6-14AWG
3 LFH600603 CID — —
100 1 LFH601001 CID — — 13.6 N-m (120 in-lbs) 2/0-6AWG
CU-AL 130˚C — • LFH60100FBC4.5 N-m (40 in-lbs) 8 AWG
3 LFH601003 CID — — 4.0 N-m (35 in-lbs) 10-14 AWG
200 1 LFH602001 C — — 31.1 N-m (275 in-lbs) 250 kcmil-6 CU-AL 130˚C — — —
3 LFH602003 C — —
400 1 LFH604001 C — — 31.1 N-m (275 in-lbs) (2) 350 kcmil-1/0 CU-AL 130˚C — — —
3 LFH604003 C — —
600 1 LFH606001 C — — 42.4 N-m (375 in-lbs) (2) 500 kcmil-4 CU-AL 130˚C — — —
3 LFH606003 C — —
Ordering Information (Class R 250 V)
AMP
RATING
POLES
ORDERING NUMBER
TORQUE
TERMINAL
WIRE
RANGE WIRE TYPE
BASE
TEMP
RATING
SNAP
TO
RELEASE
INDICATION
COVER
ORDERING
NUMBER*
BASE
ORDERING
NUMBER
SUFFIX
BOX
LUG
PRES SURE
PLATE SCREW
30
1 LFR250301 C P S
2.8 N-m (25 in-lbs)
C 6-14 AWG
CU Only
Solid/
Stranded
125˚C • — LFH25030FBC2 LFR250302 C P S P 10-14 AWG
3 LFR250303 C P S S 10-22 AWG
60
1 LFR250601 CID — — 5.6 N-m (50 in-lbs) 2-4 AWG CU-AL 125˚C • • LFH25060FBC2 LFR250602 CID — — 2.8 N-m (25 in-lbs) 6-14 AWG
3 LFR250603 CID — —
100 1 LFR251001 CID — — 13.6 N-m (120 in-lbs) 2/0-6 AWG
CU-AL 130˚C — • LFH25100FBC4.5 N-m (40 in-lbs) 8 AWG
3 LFR251003 CID — — 4.0 N-m (35 in-lbs) 10-14 AWG
200 1 LFR252001 C — — 31.1 N-m (275 in-lbs) 250 kcmil-6 CU-AL 130˚C — — —
3 LFR252003 C — —
400 1 LFR254001 C — — 31.1 N-m (275 in-lbs) (2) 350 kcmil-1/0 CU-AL 130˚C — — —
3 LFR254003 C — —
600 1 LFR256001 C — — 42.4 N-m (375 in-lbs) (2) 500 kcmil-4 CU-AL 130˚C — — —
3 LFR256003 C — —
Ordering Information (Class R 600 V)
AMP
RATING
POLES
ORDERING NUMBER
TORQUE
TERMINAL
WIRE
RANGE WIRE TYPE
BASE
TEMP
RATING
SNAP
TO
RELEASE
INDICATION
COVER
ORDERING
NUMBER*
BASE
ORDERING
NUMBER
SUFFIX
BOX
LUG
PRES SURE
PLATE SCREW
30
1 LFR600301 CID PID SID
2.8 N-m (25 in-lbs)
C 6-14 AWG
CU Only
Solid/
Stranded
130˚C • • LFH60030FBC2 LFR600302 CID PID SID P 10-14 AWG
3 LFR600303 CID PID SID S 10-22 AWG
60
1 LFR600601 CID — — 5.6 N-m (50 in-lbs) 2-4 AWG CU-AL 130˚C • • LFH60060FBC2 LFR600602 CID — — 2.8 N-m (25 in-lbs) 6-14 AWG
3 LFR600603 CID — —
100 1 LFR601001 CID — — 13.6 N-m (120 in-lbs) 2/0-6 AWG
CU-AL 130˚C — • LFH60100FBC4.5 N-m (40 in-lbs) 8 AWG
3 LFR601003 CID — — 4.0 N-m (35 in-lbs) 10-14 AWG
200 1 LFR602001 C — — 31.1 N-m (275 in-lbs) 250 kcmil-6 CU-AL 130˚C — — —
3 LFR602003 C — —
400 1 LFR604001 C — — 31.1 N-m (275 in-lbs) (2) 350 kcmil-1/0 CU-AL 130˚C — — —
3 LFR604003 C — —
600 1 LFR606001 C — — 42.4 N-m (375 in-lbs) (2) 500 kcmil-4 CU-AL 130˚C — — —
3 LFR606003 C — —
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POWR-GARD® Blocks and Holders Datasheet
3 of 6 © 2016 Littelfuse POWR-GARD® Products
Rev: 4-A-012516
CLASS H/K5 AND R FUSE BLOCKS
31.9
[1.26]
28.6 [1.13] 48.5 [1.91]
6.8 [.27]
74.7 [2.94]
40.1 [1.58]
8.4
[.33]
5.6 [.22]
R2.8 [.11]
TYP
.2 THRU
R2.8 [.11]
TYP
76.5
[3.01]
3.6 [.14]
38.2
[1.51]
44.6
[1.76]
4.8 [.19]
13.0 [.51]
15.6 [.61]
23.8 [.94]
16.3 [.64]
32.2 [1.27]
15.9 [.63]
31.8 [1.25]
42.9 [1.69]
119.7 [4.71]
37.3 [1.47]
70.7 [2.78] 104.1 [4.10] 57.4 [2.26]
24.9 [.98]
R2.8 [.11]
TYP
43.9 [1.73]
75.7 [2.98]
9.7 [.38]
14.8 [.58]
22.4 [.88]
55.8 [2.20]
43.1 [1.70]
5.5 [.21]
89.2 [3.51]
76.5 [3.01]
177.8 [7.00]
46.0 [1.81]
126.3 [4.97]
66.0 [2.60]
22.9 [.90]
R3.4 [.13]
TYP
53.6 [2.11]
72.6 [2.86]
133.0 [5.23]
11.3 [.45]
20.3 [.80]
34.7 [1.37] 60.5 [2.38]
100.6 [3.96]
51.5 [2.03]
91.6 [3.61]
250 V 30 A
250 V 60 A
250 V 100 A
Dimensions mm (inches)
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POWR-GARD® Blocks and Holders Datasheet
4 of 6 © 2016 Littelfuse POWR-GARD® Products
Rev: 4-A-012516
CLASS H/K5 AND R FUSE BLOCKS
181.1
[7.13]
76.2 [3.00]
228.6 [9.00]
Ø.3 THRU
72.4 [2.85]
15.9 [.63]
R4.3 [.17]
TYP.
63.5 [2.50]
12.7 [.50]
63.5 [2.50]
52.6
[2.07]
128.5
[5.06]
12.7 [.50]
19.1 [.75]
165.1 [6.50]
184.2 [7.25]
215.9 [8.50]
Ø.3 THRU
Ø.8 .4
88.9 [3.50]
292.1
[11.50]
95.3
[3.75]
15.9 [.63]
266.7 [10.50] 84.4 [3.32]
15.9 [.63]
108.0
[4.25]
184.2
[7.25]
22.2 [.88]
66.7 [2.63]
95.3 [3.75]
196.9 [7.75]
15.9 [.63]
250.8 [9.88]
Ø.3 THRU
Ø.8 .4
Ø.3 THRU
Ø.8 .4
355.6
[14.0]
114.3 [4.5]
114.3
[4.5]
317.5 [12.5]
19.1 [.8]
114.3 [4.5]
110.6 [4.4]
15.9 [.6]
139.7
[5.5]
215.9
[8.5]
19.1 [.8]
34.9 [1.4]
79.4 [3.1]
241.3 [9.5]
298.5 [11.8]
Ø.3 THRU
Ø.6 .4
Ø.3 THRU
Ø.8 .4
Ø.3 THRU
Ø.6 .4
250 V 200 A
250 V 400 A
250 V 600 A
Dimensions mm (inches)
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POWR-GARD® Blocks and Holders Datasheet
5 of 6 © 2016 Littelfuse POWR-GARD® Products
Rev: 4-A-012516
CLASS H/K5 AND R FUSE BLOCKS
166.
7
[6.56]
38.4 [1.51]
73.1 [2.88]
R3.4 [.13]
TYP
R2.6 [.10]
TYP
47.6
[1.87]
56.0
[2.20]
118.6
[4.67]
127.1
[5.00]
16.8 [.66]
21.5 [.85]
6.4 [.25]
19.2 [.76] 51.6 [2.03]
41.1 [1.62]
107.9 [4.25]
20.7 [.82]
52.5 [2.07]
75.9 [2.99]
86.4 [3.40]
184.2
[7.25]
43.8 [1.73]
.5 .5
R3.4 [.13]
TYP
83.6 [3.29] 123.2 [4.85]
59.7 [2.35]
22.9 [.90]
55.2
[2.18]
74.2
[2.92]
134.6
[5.30]
11.4 [.45]
19.9 [.78]
29.8 [1.17]
32.4 [1.28]
59.6 [2.35]
69.5 [2.74]
99.4 [3.91]
109.3 [4.30]
.2 THRU
600 V 30 A
600 V 60 A
600 V 100 A
Dimensions mm (inches)
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POWR-GARD® Blocks and Holders Datasheet
6 of 6 © 2016 Littelfuse POWR-GARD® Products
Rev: 4-A-012516
CLASS H/K5 AND R FUSE BLOCKS
244.3
[9.62]
76.2 [3.00]
12.7 [.50]
52.3
[2.06]
84.2
[3.32]
228.6 [9.00]
12.7 [.50]
31.8 [1.25]
Ø.3 THRU
Ø.3 THRU
Ø.3 THRU
Ø.3 THRU
Ø.8 .4
R4.3 [.17]
TYP.
52.3
[2.06]
72.4
[2.85]
15.9
[.63]
160.1
[6.31]
192.0
[7.56]
63.5 [2.50] 44.5 [1.75]
63.5 [2.50] 165.1 [6.50]
76.7
[3.02]
84.1
[3.31]
160.3
[6.31]
196.9 [7.75]
Ø.7 .4
Ø.8 .4
88.9 [3.50]
368.3
[14.50]
15.9 [.63]
22.2 [.88]
95.3
[3.75]
146.1
[5.75]
266.7 [10.50]
15.9 [.63]
84.4 [3.32]
15.9 [.63]
222.3
[8.75]
273.1
[10.75]
66.7 [2.63]
73.0 [2.88]
250.8 [9.88]
Ø.8 .4
Ø.3 THRU
114.3 [4.50]
431.8
[1
7.00]
19.1 [.75]
114.3
[4.50]
177.8
[7.00]
317.5 [12.50]
110.6 [4.3
6]
15.9 [.63]
254.0
[10.00]
34.9 [1.38]
79.4 [3.13]
95.3 [3.75]
19.1 [.75]
298.5 [11.75]
Ø.8 .4
Ø.3 THRU
Ø.6 .4
Ø.3 THRU
600 V 200 A
600 V 400 A
600 V 600 A
Dimensions mm (inches)