LH600303C - Littelfuse - Datasheet.Directory

Blocks and Holders

111

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Blocks and Holders

Fuse Blocks

General Information

Fuse Block Selection

The following guidelines should help simplify the selection of proper

fuse blocks:

1. Determine the system voltage

Since fuses are selected on the basis of system voltage, fuse blocks are

selected to match the voltage rating of the fuse.

2. Determine the design short-circuit current

Available and/or design short-circuit current is an important

consideration when determining the class of fuse and fuse blocks to

use. If available short-circuit current cannot be determined, or if it will

vary with equipment location, select fuses with a 200,000 ampere

interrupting rating (A.I.R.) and mating fuse blocks with a withstand rating

of 200,000 amperes for maximum safety.

Class H fuse blocks will accept Class H or K5 fuses (which have an

interrupting rating of up to 50,000 amperes) and Class R fuses (which

have a 200,000 A.I.R.). To prevent the possibility of inserting a fuse

with the incorrect interrupting rating, the use of Class R fuse blocks is

recommended for use with Class R fuses. Use Class H fuse blocks with

Class H or K5 fuses. These fuse blocks are dimensionally the same, but

the Class R fuse blocks incorporate a rejection feature which allows only

Class R fuses to be inserted.

3. Determine the type and ampere rating of the fuse to be used

In addition to voltage and interrupting rating as discussed above, the

fuse ampere rating, opening characteristics (fast acting or time-delay)

and size are other important considerations in fuse selection. Once the

fuse type is selected, the mating fuse block can be chosen. Fuse blocks

are available in 30, 60, 100, 200, 400 and 600 amp ratings, and may be

used with a fuse rated at the corresponding amperage rating or below.

For example, a fuse block rated at 30 amperes may be used with a fuse

rated from 0 to 30 amperes.

4. Determine if NEC, CSA, UL, or other requirements

are applicable

If fuse blocks will be installed in equipment to be submitted for agency

approval, the requirements should be obtained from the approving

agency in advance of fuse and fuse block selection.

5. Select the type of wire termination

A choice of three types of wire termination is available:

a) Screw* — for use with spade lugs or ring terminals.

b) Screw with Pressure Plate* — for use with solid or stranded wire

without terminal. Recommended where vibration will be a factor.

c) Box Lug — the most durable. For use with all types of solid wire and

Class B and Class C stranded wire. Not for use with welding cable or

other rope-stranded conductors.

* 1/4” Quick Connect terminals rated for up to 20A are

available on the Midget and Class CC fuse blocks.

6. Decide on the number of poles in each block

The number of poles for each set of fuses is determined by the

characteristics of the circuit. The option to gang individual fuse blocks

into long strips will be determined by the available space and by the

type of wire being used.

7. Determine if fuse clips need to be reinforced

Fuse clips may have a tendency to lose some of their tension over a

period of time. This may be prevented by specifying reinforced fuse

clips. Reinforced clips are standard on certain fuse blocks (see individual

product pages).

Ordering Information

The Littelfuse fuse block part number consists of 6 or 7 components, as

shown below and in the individual fuse block data tables.

For all Class R, H, J, T and 15, 20

& 60A Class G Fuse Blocks

For all Class CC, Midget and 30A

Class G Fuse Blocks

Screw

with

Pressure

Plate

(P)

Screw

(S)

Box

Lug

(C)

Blocks and Holders

112 www.littelfuse.com

Blocks and Holders

Class H/K5 and R Fuse Blocks

250 and 600 Volt

Class H 600V

Amp

Rating

No. of

Poles

Catalog

Number

Connector Type

(Add Suffix Shown) Maximum Wire

Size

Screw

Pressure

Plate

Box

Lug

1 LH60030-1 S (R) P (R) C (R) S & P = #10 CU

30 2 LH60030-2 S (R) P (R) C (R) C = #6 CU-AL

3 LH60030-3 S (R) P (R) C (R)

1 LH60060-1 C (R) S = #10 CU

60 2 LH60060-2 C (R) C = #2 CU-AL

3 LH60060-3 C (R)

1 LH60100-1 C

100 2 LH60100-2 C #2/0 CU-AL

3 LH60100-3 C

1 LH60200-1 C

200 3 LH60200-3 C 250 MCM CU-AL

1 LH60400-1 CR

400 3 LH60400-3 CR (2) 350 MCM CU-AL

1 LH60600-1 C

600 3 LH60600-3 C (2) 500 MCM CU-AL

Note: Reinforcing springs standard on all Class H fuse blocks 100 amperes and above.

Class H 250V

Amp

Rating

No. of

Poles

Catalog

Number

Connector Type

(Add Suffix Shown) Maximum Wire

Size

Screw

Pressure

Plate

Box

Lug

1 LH25030-1 S (R) P (R) C (R) S & P = #10 CU

30 2 LH25030-2 S (R) P (R) C (R) C = #6 CU-AL

3 LH25030-3 S (R) P (R) C (R)

1 LH25060-1 S (R) C (R) S = #10 CU

60 2 LH25060-2 S (R) C (R) C = #2 CU-AL

3 LH25060-3 S (R) C (R)

1 LH25100-1 C

100 2 LH25100-2 C #2/0 CU-AL

3 LH25100-3 C

1 LH25200-1 C

200 3 LH25200-3 C 250 MCM CU-AL

1 LH25400-1 CR

400 3 LH25400-3 CR (2) 350 MCM CU-AL

1 LH25600-1 C

600 3 LH25600-3 C (2) 500 MCM CU-AL

Note: Reinforcing springs standard on all Class H fuseblocks 100 amperes and above.

Class R 250V

Amp

Rating

No. of

Poles

Catalog

Number

Connector Type

(Add Suffix Shown) Maximum Wire

Size

Screw

Pressure

Plate

Box

Lug

1 LR25030-1 SR PR CR S & P = #10 CU

30 2 LR25030-2 SR PR CR C = #6 CU-AL

3 LR25030-3 SR PR CR

1 LR25060-1 CR S = #10 CU

60 2 LR25060-2 CR C = #2 CU-AL

3 LR25060-3 CR

1 LR25100-1 C

100 2 LR25100-2 C #2/0 CU-AL

3 LR25100-3 C

1 LR25200-1 C

200 3 LR25200-3 C 250 MCM CU-AL

1 LR25400-1 CR

400 3 LR25400-3 CR (2) 350 MCM CU-AL

1 LR25600-1 C

600 3 LR25600-3 C (2) 500 MCM CU-AL

Note: Reinforcing springs standard on all Class R fuse blocks.

Class R 600V

Amp

Rating

No. of

Poles

Catalog

Number

Connector Type

(Add Suffix Shown) Maximum Wire

Size

Screw

Pressure

Plate

Box

Lug

1 LR60030-1 SR PR CR S & P = #10 CU

30 2 LR60030-2 SR PR CR C = #6 CU-AL

3 LR60030-3 SR PR CR

1 LR60060-1 CR S = #10 CU

60 2 LR60060-2 CR C = #2 CU-AL

3 LR60060-3 CR

1 LR60100-1 C

100 2 LR60100-2 C #2/0 CU-AL

3 LR60100-3 C

1 LR60200-1 C

200 3 LR60200-3 C 250 MCM CU-AL

1 LR60400-1 CR

400 3 LR60400-3 CR (2) 350 MCM CU-AL

1 LR60600-1 C

600 3 LR60600-3 C (2) 500 MCM CU-AL

Note: Reinforcing springs standard on all Class R fuse blocks.

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

• Class H and Class R fuse blocks feature clip designs to maximize

electrical contact and minimize heat rise.

• Reinforcing clips are standard on all Class H fuse blocks rated 100

amp and higher. Note: For reinforcing clips on Class H blocks rated 30-60

amp, add “R” suffix to connector type.

• Reinforcing clips are standard on all Class R fuse blocks

Specifications

Voltage Rating: 250 Volts; 600 Volts

Ampere Ratings: 0 – 600 amperes

Approvals: UL Listed (File No. E14721)

CSA Certified (File No. LR73091)

Recommended Fuses

Note: For optional fuse block covers, refer to POWR-Covers section of this catalog.

Class H Blocks Class R Blocks

250V 600V 250V 600V

NLN NLS FLNR/FLNR_ID FLSR/FLSR_ID

RLN RLS KLNR KLSR

LLNRK LLSRK/LLSRK_ID

TLN IDSR

Blocks and Holders

113

www.littelfuse.com

Blocks and Holders

.28 (7.1) THRU

.53 (13.5) C'BORE x .60 (15.2) DP

6.13

.61

.63

1.56

TYP.

1.56

TYP. FUSE q

2.37

1.88

.187 HEX

SOCKET

3 POLE 2 POLE 1 POLE

STRIP

GAUGE

STRIP

GAUGE

STRIP

GAUGE

STRIP

GAUGE

3.49

[88.6]

1.93

[49.0]

5.05

[128.3]

2.44

[62.0]

Class H/K5 and R Fuse Blocks

250 Volt

3.00"

[76.2]

.50"

[13]

1.25"

[31.8]

.22/5.6 DIA. HOLE THRU

4 PLACES

.75"

[19]

1.25"

[31.7]

1.12"

[28.4]

1.91"

[48.5]

2.95"

[74.9]

2.50"

[63.5]

.22"

[5.7]

.33"

[8.4]

.19"

[4.8]

1.38"

[35.1]

.53"

[13]

1.50"

[38.1]

1.50"

[38.1]

1 POLE 2 POLE 3 POLE

2.01"

[51.1]

.74"

[19]

4.23"

[108]

.50"

[12.7]

.49

[12] 1.33"

[33.7]

4.83"

[122.7]

1.33"

[33.7]

1.24"

[31.5]

1.79"

[45.6]

2.86"

[72.7]

.50"

[12.7]

.49"

[12]

4.83"

[122.7]

1.33"

[33.7]

1.24"

[31.5]

1.79"

[45.6]

1.48"

[37.6]

.50"

[12.7]

4.83"

[122.7]

.49"

[12]

1.24"

[31.5]

1.79"

[45.6]

.218/[5.54] DIA.

C'BORE .400/[10.16] DIA. X .63[16] DP

1 POLE 2 POLE 3 POLE

250V 30A

250V 60A

250V 100A

Blocks and Holders

114 www.littelfuse.com

Blocks and Holders

[355.6]

[279.4]

[19]

[111]

4.37"

4.50"

[317.5]

[114.3]

14.00"

.75"

5.00"

12.50"

[127]

11.00"

[355.6]

4.50"

[114.3]

14.00"

4.50"

[114.3]

5.00"

[127]

10.50"

3.31"

9.25"

[235] [84]

[266.7]

3.75"

[292.1]

11.50"

[95.3]

3.75

[292.1]

11.50"

4.00"

[101.6] 4.00"

[101.6]

[95.2]

3.50"

[88.9]

.66"

2.00"

9.00"

.50"

[229]

[52.3]

2.06"

3.01"

1.06"

[76.5]

[102]

4.00"

[16.8]

[26.9]

3.00"

[31.2] [76.2]

1.23"

[50.8]

[13]

2.00"

3.00"

.50"

[76.2]

3.00"

[76.2]

3.00"

[76.2]

[52.3]

2.06"

.312" HEX.

7.13"

[181.1]

7.13"

[181.1]

[50.8]

[13]

1 POLE 3 POLE

[355.6]

[279.4]

[19]

[111]

4.37"

4.50"

[317.5]

[114.3]

14.00"

.75"

5.00"

12.50"

[127]

11.00"

[355.6]

4.50"

[114.3]

14.00"

4.50"

[114.3]

5.00"

[127]

10.50"

3.31"

9.25"

[235] [84]

[266.7]

3.75"

[292.1]

11.50"

[95.3]

3.75

[292.1]

11.50"

4.00"

[101.6] 4.00"

[101.6]

[95.2]

3.50"

[88.9]

.66"

2.00"

9.00"

.50"

[229]

[52.3]

2.06"

3.01"

1.06"

[76.5]

[102]

4.00"

[16.8]

[26.9]

3.00"

[31.2] [76.2]

1.23"

[50.8]

[13]

2.00"

3.00"

.50"

[76.2]

3.00"

[76.2]

3.00"

[76.2]

[52.3]

2.06"

.312" HEX.

7.13"

[181.1]

7.13"

[181.1]

[50.8]

[13]

1 POLE 3 POLE

Class H/K5 and R Fuse Blocks

250 Volt

[355.6]

[279.4]

[19]

[111]

4.37"

4.50"

[317.5]

[114.3]

14.00"

.75"

5.00"

12.50"

[127]

11.00"

[355.6]

4.50"

[114.3]

14.00"

4.50"

[114.3]

5.00"

[127]

10.50"

3.31"

9.25"

[235] [84]

[266.7]

3.75"

[292.1]

11.50"

[95.3]

3.75

[292.1]

11.50"

4.00"

[101.6] 4.00"

[101.6]

[95.2]

3.50"

[88.9]

.66"

2.00"

9.00"

.50"

[229]

[52.3]

2.06"

3.01"

1.06"

[76.5]

[102]

4.00"

[16.8]

[26.9]

3.00"

[31.2] [76.2]

1.23"

[50.8]

[13]

2.00"

3.00"

.50"

[76.2]

3.00"

[76.2]

3.00"

[76.2]

[52.3]

2.06"

.312" HEX.

7.13"

[181.1]

7.13"

[181.1]

[50.8]

[13]

1 POLE 3 POLE

250V 400A

250V 200A

250V 600A

Blocks and Holders

115

www.littelfuse.com

Blocks and Holders

8.13

.87

.61 1.81

TYP.

4.26

1.93

3 POLE

.187 HEX

SOCKET

.28 (7.1) DIA. THRU

.59 (14.9) C'BORE x .64 (16.2) DP.

TYP.

2 POLE 1 POLE

2.10

[53.3]

3.91

[99.3]

5.73

[145.5]

2.60

[66.0]

STRIP

GAUGE

STRIP

GAUGE

STRIP

GAUGE

STRIP

GAUGE

Class H/K5 and R Fuse Blocks

600 Volt

6.25"

[159]

6.25"

[159]

6.25"

[159]

1.69"

[42.9]

1.63"

[41.4] 2.94"

[74.7]

4.25"

[108]

3.13"

[79.2]

.62"

[16]1.56"

[39.6]

3.13"

[79.4]

3.13"

[79.4]

3.13"

[79.4]

.34"

[8.7]

.31"

[7.9]

.38"

[97]

.25"

[6.5] .69"

[18]

.265" [6.7] DIA. THRU

.05" [12.7] C'BORE

x .44 [11.2] DP.

1 POLE 2 POLE 3 POLE

6R30

3.51"

[89.2]

.77"

[19.6]

.27"

[6.8]

.66"

[19.6]

.62"

[15.7]

3.12"

[79.2]

6.75"

[171.4]

1.95"

[49.5]

.281" D.

[7.1]

.50" D.

[12.7]

1.81"

[46]

1.29"

[32.8]

1.56"

[39.6]

1.56"

[39.6]

5.08"

[1.29]

3.12"

[79.2]

3.12"

[79.2]

2.12"

[53.8]

1 POLE 2 POLE 3 POLE

6R60

600V 30A

600V 60A

600V 100A

Blocks and Holders

116 www.littelfuse.com

Blocks and Holders

[431.8]

[279.4]

[19]

[109.5]

4.31"

4.50"

[317.5]

[114]

17.00"

.75"

8.00"

12.50"

[203]

11.00"

[431.8]

4.50"

[114]

17.00"

4.50"

[114.3]

8.00"

[203]

10.50"

3.31"

9.25"

[235] [84.1]

[266.7][57.2]

3.75"

7.00"

[177.8]

[95.3]

2.25"

[76.2 ]

3.00"

3.75

[368.3]

14.50"

[368.3]

14.50"

7.00"

[177.8]

[95.3]

3.50 "

[88.9]

.66"

2.00"

9.00"

.50"

[229]

[84.1]

3.31"

3.00"

[76.2]

3.01"

1.06"

[76.5]

[102]

4.00"

[244]

[16.8]

[26.0]

3.00"

[31.2] [76.2]

1.23"

[50.8]

[13]

2.00"

3.00"

.50"

[76.2]

[84.1]

3.31"

3.00"

[76.2]

.312" HEX.

9.62" 9.62"

[244]

[50.8]

[13]

1 POLE 3 POLE

[431.8]

[279.4]

[19]

[109.5]

4.31"

4.50"

[317.5]

[114]

17.00"

.75"

8.00"

12.50"

[203]

11.00"

[431.8]

4.50"

[114]

17.00"

4.50"

[114.3]

8.00"

[203]

10.50"

3.31"

9.25"

[235] [84.1]

[266.7][57.2]

3.75"

7.00"

[177.8]

[95.3]

2.25"

[76.2 ]

3.00"

3.75

[368.3]

14.50"

[368.3]

14.50"

7.00"

[177.8]

[95.3]

3.50 "

[88.9]

.66"

2.00"

9.00"

.50"

[229]

[84.1]

3.31"

3.00"

[76.2]

3.01"

1.06"

[76.5]

[102]

4.00"

[244]

[16.8]

[26.0]

3.00"

[31.2] [76.2]

1.23"

[50.8]

[13]

2.00"

3.00"

.50"

[76.2]

[84.1]

3.31"

3.00"

[76.2]

.312" HEX.

9.62" 9.62"

[244]

[50.8]

[13]

1 POLE 3 POLE

[431.8]

[279.4]

[19]

[109.5]

4.31"

4.50"

[317.5]

[114]

17.00"

.75"

8.00"

12.50"

[203]

11.00"

[431.8]

4.50"

[114]

17.00"

4.50"

[114.3]

8.00"

[203]

10.50"

3.31"

9.25"

[235] [84.1]

[266.7][57.2]

3.75"

7.00"

[177.8]

[95.3]

2.25"

[76.2 ]

3.00"

3.75

[368.3]

14.50"

[368.3]

14.50"

7.00"

[177.8]

[95.3]

3.50 "

[88.9]

.66"

2.00"

9.00"

.50"

[229]

[84.1]

3.31"

3.00"

[76.2]

3.01"

1.06"

[76.5]

[102]

4.00"

[244]

[16.8]

[26.0]

3.00"

[31.2] [76.2]

1.23"

[50.8]

[13]

2.00"

3.00"

.50"

[76.2]

[84.1]

3.31"

3.00"

[76.2]

.312" HEX.

9.62" 9.62"

[244]

[50.8]

[13]

1 POLE 3 POLE

Class H/K5 and R Fuse Blocks

600 Volt

600V 200A

600V 400A

600V 600A

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Littelfuse:

LH250602SR LR600302SR LH600303SR LH254003CR LH250602CR LR600302CR LH251001C LH250302S

LR600301PR LR602001C LR600301CR LR604003CR LH254001CR LH25030PC LR250303CR LH250302SR

LH602003C LH604003CR LH252001C LR600601CR LH250603C LH600303P LH250601C LH25100PC

LR250301CR LH250602C LH250301SR LH252003C LH600603C LH600601CR LR250601CR LH250303S

LR600602CR LH250301CR LH600303C LH600603CR LH251003C LH60060PC LR254003CR LR602003C

LR250603CR LR600303SR LR601003C LR251003C LH256003C LR252003C LH250303CR LH250303P

LR250302CR LR256003C LR600303CR LH600301PR LR254001CR LR600303PR LR250303SR LR600302PR

LH606003C LH601001C LH250301PR LH256001C LH25060PC LH250303SR LR250301SR LH604001CR

LH250302P LH600301S LH600301P LH600302CR LH602001C LH600303S LH250301C LH600302P LH250301P

LH600302C LH600602CR LH600301C LH600301CR LR250303PR LH600601C LH250303C LR600603CR

LR606003C LR606001C LR250302PR LR601001C LR250602CR LH250601CR LH250302PR LR251001C

LH250302C LR250302SR LR604001CR LH600303CR LH600602C LH250603CR LH250301S LR252001C

LH600302S LH250303PR LR256001C