LITTELFUSE L70S90, L70S800, L70S700, L70S70, L70S100 Datasheet

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Semiconductor Fuses

150/250/500/600/700 V A C■Very Fast-Acting■1 – 1000 Amperes

Designed to protect today’s equipment and systems,
Littelfuse semiconductor fuses are manufactured with
Littelfuse-developed technology that sets tomorrow’s stan­dards for accuracy, consistent quality, reliability, and predict­able performance. By using advanced metallurgical, polymer,
and materials research; mathematical modeling, and comput­erized statistical analysis;Littelfuse engineers have redefined
“State-of-the-Art.”

APPLICATIONS

Designed specifically for supplementary protection of
semiconducting devices such as silicon controlled rectifiers
(SCR’s), diodes, thyristors, triacs, transistors, and similar
solid-state devices. These devices are used in power
equipment including variable speed drives, power rectifiers,
UPS systems, DC power supplies, and in a wide range of
electronic equipment.

May be used wherever extremely fast-acting, current-limiting
fuses with no time delay are required.

SPECIFICATIONS

Voltage Ratings: L15S:150 V AC/DC (1 – 60A)

150 VAC (70 – 1000A)
100 VDC (70 – 1000A)

L25S:250 V AC/DC (1 – 200A)

250 VAC (225 – 800A)

200 VDC (225 – 800A)
L50S:500 VAC/450VDC
L60S:600 VAC
KLC: 600 V A C
L70S:700VAC/650VDC

Interrupting Rating:AC: 200,000 rms amperes

(L15S series 100,000 amperes)

DC: 20,000 amperes

Ampere Range: 1 – 1000 amperes

See Rating Table for ratings available
in each series.

Approvals: UL Recognized under the Components Program

and CSA Recognized under the Component
Acceptance Program.
UL File No: E71611
CSA File No: LR29862

L15S and L25S series fuses are Littelfuse
Certified for DC ratings shown in Rating Table.

AMPERE RATINGS

See Rating Table.

RECOMMENDED FUSE BLOCKS

LSCR series:Refer to Fuse Block section of this catalog for

additional information.

SAFETY

■

200,000 A.I.R. — Reliable interruption of all overcurrents up
to 200,000 amperes . . . meets present and future system
requirements. (Note: L15S series has 100,000 A.I.R.)

■

Extremely Current Limiting — Low I2t and peak let-through
currents meet most semiconductor requirements.

■

UL Recognized — Littelfuse semiconductor fuses are
recognized under the components program of Underwriters
Laboratories, Inc., and carry the mark. UL Recognized
semiconductor fuses may be used to provide supplemen­tary protection in UL listed equipment.

LONGER EQUIPMENT LIFE

■

Low Watt Losses — Means less heating and power
consumption in circuit.

■

Controlled Transient Overvoltages — All circuits are subject
to transient overvoltages during fault current interruption.
These transient overvoltages (arc voltages) start when fuse
links melt or circuit breaker contacts part, and subside
when circuit is interrupted. Semiconductors are very
sensitive to overvoltages. Littelfuse semiconductor fuse
designs keep transient overvoltages to low levels and help
reduce semiconductor failure.

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‡ KLC series fuses are recommended for replacement use only.

Semiconductor Fuses

150/250/500/600/700 V A C■Very Fast-Acting■1 – 1000 Amperes

Series & Voltage

L15S L25S L50S L60S KLC‡ L70S

150V AC 250V AC

150V DC (1 – 60A) 250V DC (1 – 200A)

500V AC

600V AC 600V AC

700V AC

100V DC (70 – 1000A) 200V DC (225 – 800A)

450V DC 650V DC

1 L15S 1 L25S 1 L60S 1 KLC 1
2 L15S 2 L25S 2 L60S 2 KLC 2
3 L15S 3 L25S 3 L60S 3 KLC 3
4 L15S 4 L25S 4 L60S 4 KLC 4
5 L15S 5 L25S 5 L60S 5 KLC 5

6 L15S 6 L25S 6 L60S 6 KLC 6
7 L15S 7 KLC 7
8 L15S 8 L25S 8 L60S 8 KLC 8
9 L15S 9

10 L15S 10 L25S 10 L50S 10 L60S 10 KLC 10 L70S 10
12 L15S 12 L25S 12 L50S 12 L60S 12 KLC 12

15 L15S 15 L25S 15 L50S 15 L60S 15 KLC 15 L70S 15

171⁄2 L60S 171⁄2 KLC 171⁄2

20 L15S 20 L25S 20 L50S 20 L60S 20 KLC 20 L70S 20
25 L15S 25 L25S 25 L50S 25 L60S 25 KLC 25 L70S 25

30 L15S 30 L25S 30 L50S 30 L60S 30 KLC 30 L70S 30
35 L15S 35 L25S 35 L50S 35 L60S 35 KLC 35 L70S 35
40 L15S 40 L25S 40 L50S 40 L60S 40 KLC 40 L70S 40
45 L15S 45 L25S 45 L60S 45 KLC 45
50 L15S 50 L25S 50 L50S 50 L60S 50 KLC 50 L70S 50

60 L15S 60 L25S 60 L50S 60 L60S 60 KLC 60 L70S 60
70 L15S 70 L25S 70 L50S 70 L60S 70 KLC 70 L70S 70
80 L15S 80 L25S 80 L50S 80 L60S 80 KLC 80 L70S 80
90 L15S 90 L25S 90 L50S 90 L60S 90 KLC 90 L70S 90

100 L15S 100 L25S 100 L50S 100 L60S 100 KLC 100 L70S 100
110 KLC 110

125 L15S 125 L25S 125 L50S 125 L60S 125 KLC 125 L70S 125
150 L15S 150 L25S 150 L50S 150 L60S 150 KLC 150 L70S 150
175 L25S 175 L50S 175 L60S 175 KLC 175 L70S 175
200 L15S 200 L25S 200 L50S 200 L60S 200 KLC 200 L70S 200

225 L25S 225 L50S 225 L60S 225 KLC 225 L70S 225
250 L15S 250 L25S 250 L50S 250 L60S 250 KLC 250 L70S 250
275 L25S 275 L50S 275
300 L15S 300 L25S 300 L50S 300 L60S 300 KLC 300 L70S 300
350 L15S 350 L25S 350 L50S 350 L60S 350 KLC 350 L70S 350

400 L15S 400 L25S 400 L50S 400 L60S 400 KLC 400 L70S 400
450 L15S 450 L25S 450 L50S 450 L60S 450 KLC 450 L70S 450
500 L15S 500 L25S 500 L50S 500 L60S 500 KLC 500 L70S 500
550 L50S 550
600 L15S 600 L25S 600 L50S 600 L60S 600 KLC 600 L70S 600

700 L25S 700 L50S 700 L60S 700 KLC 700 L70S 700
800 L15S 800 L25S 800 L50S 800 L60S 800 KLC 800 L70S 800
900

1000 L15S 1000

Ampere
Ratings

RA TING T ABLE