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POWR-GARD

Blocks and Holders Datasheet

1 of 6

Products

Rev: 011513

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

Littelfuse.com/fuseblocks

Recommended Fuses

Class H/K5 Blocks – 250 V

NLN, RLN

Class R Blocks – 250 V

FLNR/FLNR_ID, KLNR, LLNRK

Class H/K5 Blocks – 600 V

NLS, RLS

Class R Blocks – 600 V

FLSR/FLSR_ID, KLSR, LLSRK/LLSRK_ID, IDSR

Note: Reinforcing springs standard on all Class H fuse blocks. *Covers sold individually. One cover needed for each pole.

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

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

1 LFH250601 CID — —

5.6 N-m (50 in-lbs)

2.8 N-m (25 in-lbs)

2-4 AWG

6-14 AWG

CU-AL 125˚C • • LFH25060FBC2 LFH250602 CID — —

3 LFH250603 CID — —

100

LFH251001

LFH251003

CID

—

13.6 N-m (120 in-lbs)

2/0-6 AWG

CU-AL 130˚C — • LFH25100FBC

4.5 N-m (40 in-lbs) 8 AWG

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 — —

1 2 3 4 5 6

Summary of Contents

Page 1 - Blocks and Holders Datasheet

Page 2

Page 3 - CLaSS H/K5 and r FuSe bLoCKS

Page 4

Page 5

Page 6

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Littelfuse LFR Series User Manual

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Summary of Contents

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