LT60100FBC - Littelfuse - Product.Network

Blocks and Holders

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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

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Blocks and Holders

Class T Fuse Blocks

300 and 600 Volt

.31"

[7.9]

2.88"

[73.0]

2.25"

[57.2]

1.19"

[30.2]

1.13"

[28.6]

0.62"

[15.9]

3.50"

[88.9]

1.12"

[28.5]

1.13"

[28.6]

0.218" [5.54] THRU

0.39" [9.91] C'BORE

x 0.44" [9.91] DP.

2.88

[73.0]

2.25

[57.2]

1.19

[30.2]

1.13

[28.6]

2.38

[60.3]

.31

[7.9]

2 POLE 3 POLE

LT30030

Class T 300V

Amp

Rating

No. of

Poles

Catalog

Number

Connector Type

(Add Suffix Shown) Maximum

Wire Size

Screw Box Lug

30 2 LT30030-2 CR S = #10 CU

3 LT30030-3 CR C = #2 CU

2 LT30060-2 CR

C = #2 CU-AL3 LT30060-3 CR

4 LT30060-4 CR

100

1 LT30100-1 C

#2 ⁄0 CU-AL2 LT30100-2 C

3 LT30100-3 C

200 1 LT30200-1 C 250 MCM CU-AL

400 1 LT30400-1 C (2) 250 MCM CU-AL

600 1 LT30600-1 C (2) 500 MCM CU-AL

Note: Reinforcing springs standard on all 300 volt Class T fuse blocks up to 100

amperes. 300 volt Class T blocks 200 amperes and larger have stud mountings.

Class T 600V

Amp

Rating

No. of

Poles

Catalog

Number

Connector Type

(Add Suffix Shown) Maximum

Wire Size

Screw Box Lug

1 LT60030-1 SR CR S = #10 CU

2 LT60030-2 SR CR C = #2 CU-AL

3 LT60030-3 SR CR

1 LT60060-1 CR

C = #2 CU-AL2 LT60060-2 CR

3 LT60060-3 CR

100

1 LT60100-1 C

#2 ⁄0 CU-AL2 LT60100-2 C

3 LT60100-3 C

200 1 LT60200-1 C 250 MCM CU-AL

400 1 LT60400-1 C (2) 250 MCM CU-AL

600 1 LT60600-1 C (2) 500 MCM CU-AL

Note: Reinforcing springs standard on all 600 volt Class T fuse blocks up to 60

amperes. 600 volt Class T blocks 100 amperes and larger have stud mountings.

Features/Benefits

Bases are molded phenolic. To provide a low resistance connection and

long-range reliability, steel reinforcing springs are supplied as standard.

Larger blocks employ an integral heat sink for maximum heat dissipation.

Specifications

Voltage Ratings: 300 Volts AC

600 Volts AC

Ampere Ratings: 0 – 600 amperes

Approvals: UL Listed (File No. E14721)

CSA Certified (File No. LR73091)

Recommended Fuses

JLLN (300V) and JLLS (600V) series fuses

300 and 600 volt fuse blocks are designed for use with miniaturized Class T

fuses. Class T fuses are very fast acting, current-limiting, and approximately

one-third the size of electrically comparable Class RK1 fuses.

Blocks and Holders

121

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Blocks and Holders

.31"

[7.9]

2.88"

[73.0]

2.25"

[57.2]

1.19"

[30.2]

1.13"

[28.6]

0.62"

[15.9]

3.50"

[88.9]

1.28"

[32.5]

1.13"

[28.6]

0.20"

[5.2]

1.20"

[30.6]

2.06"

52.4]

0.44"

[11.1]

3.09"

[78.6]

4.47"

[113.5]

0.218" [5.54] THRU

0.39" [9.91] C'BORE

x 0.44" [9.91] DP.

2.88

[73.0]

2.25

[57.2]

1.19

[30.2]

1.13

[28.6]

2.38

[60.3]

0.31

[7.9]

2 POLE 3 POLE 4 POLE

4.50"

[114.3]

5.25"

[133.3]

3.09"

[78.6]

1.56"

[39.6]

1.37

[34.8]

.203" [5.1]

DIA.HOLE

0.69"

[17.5]

.37" [9.5]

C'BORE

4.78"

[121.4]

2.39"

[60.7]

0.18"

[4.6]

1.87"

[47.5]

1 POLE 2 POLE

1.41"

[35.7]

4.50"

[114.3]

5.25"

[133.3]

4.12"

[104.6]

2.75"

[69.8]

0.69"

[17.5]

3 POLE

3T600

6.25"

[158.7]

7.00"

[177.8]

1.69"

[42.9]

1.50"

[38.1]

.281" [7.1]

DIA.HOLE

.69"

[17.5]

.50" [12.7]

C'BORE

1 POLE

.18"

[4.6]

2.25"

[57.1]

1 POLE

8.12"

[206.2]

7.37"

[187.3]

1.12"

[28.6]

1.84"

[46.7]

0.28" [7.1] DIA HOLE

0.50" [12.7] C'BORE

x 0.43" [10.9] DEEP

2.25"

[57.1]

0.19"

[48]

2.37"

[60.2]

0.62"

[15.7]

1 POLE

8.75"

[222.2]

8.06"

[203.2]

2.03"

[51.6]

0.28" [7.1] DIA HOLE

0.50" [12.7] C'BORE

x 0.43" [10.9] DEEP

2.75"

[69.8]

0.37"

[9.5]

0.19"

[4.8]

2.62"

[66.5]

0.62"

[15.7]

Class T Fuse Blocks

300 Volt

LT30060

LT30100

LT30200 LT30400 LT30600

Blocks and Holders

122 www.littelfuse.com

Blocks and Holders

5.31"

[134.9]

[153.9]

2.36"

[6.0]

1.37

[34.8]

0.203" [5.1]

DIA.HOLE

0.69"

[17.5]

0.37" [9.5]

C'BORE

5.31"

[134.9]

2.39"

[60.7]

4.78"

[121.4]

6.06"

[153.9]

3.09'"

[78.6]

1.41"

[35.7]

4.12"

[104.6]

2.75"

[69.8]

0.69"

[17.5]

0.18"

[4.6]

1.87"

[47.5]

1 POLE 3 POLE

2 POLE

6T100

6.06'

3.13"

[79.4]

1.56"

[39.7]

0.218" x 0.655"

[5.54 x 16.64]

SLOT 2 PLS.

0.78"

[20]

3.38"

[85.7]

1.69"

[42.9]

2 POLE1 POLE

1.81"

[46.0]

2.31"

[58.7]

0.91"

[23.0]

0.63"

[16]

1.74"

[44.2]

0.218" x 0.655"

[5.54 x 16.64]

SLOT 2 PLS.

4.69"

[119]

1.56"

[39.7]

0.78"

[20]

3.38"

[85.7]

1.69"

[42.9]

3 POLE

3.13"

[79.4]

0.91"

[23.0]

0.33"

[8.3]

1.44"

[36.5]

0.33"

[8.3]

0.55"

[13.9]

1.56"

[39.7]

0.218" x 0.655"

[5.54 x 16.64]

SLOT 2 PLS.

0.78"

[20]

3.38"

[85.7]

1.69"

[42.9]

0.218" x 0.655"

[5.54 x 16.64]

SLOT 2 PLS.

4.69"

[119]

1.56"

[39.7]

0.78"

[20]

3.38"

[85.7]

1.69"

[42.9]

2 POLE1 POLE 3 POLE

0.62"

[15.9]

1.28"

[32.5]

3.19"

[81.0]

Class T Fuse Blocks

600 Volt

LT60030

LT60060

LT60100

Blocks and Holders

123

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Blocks and Holders

7.0"

[177.8]

7.75"

[196.8]

2.50"

[63.5]

1.50"

[38.1]

0.281" [7.1]

DIA.HOLE

0.75"

[19.0]

0.50" [12.7]

C'BORE

1 POLE

.18"

[4.6]

2.25"

[57.1]

6T200

9.00"

[228.6]

8.25"

[209.5]

1.12"

[28.6]

2.72"

[69.1]

0.28" [7.1] DIA HOLE

0.50" [12.7] C'BORE

x 0.43" [10.9] DEEP

2.25"

[57.1]

0.19"

[4.8]

2.37"

[60.2]0.62"

[15.7]

1 POLE

6T400

9.75"

[247.6]

9.0"

[228.6]

2.95"

[75.0]

0.28" [7.1] DIA HOLE

0.50" [12.7] C'BORE

x 0.43" [10.9] DEEP

2.75"

[69.8]

0.37"

[9.5]

0.19"

[4.8]

2.62"

[66.5] 0.62"

[15.7]

1 POLE

6T600

Class T Fuse Blocks

600 Volt

LT60200 LT60400

LT60600