Semiconductor Fuses 150/250/500/600/700 VAC ■ Very Fast-Acting ■ 1 – 1000 Amperes 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 VAC 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 (File No. E71611) CSA Recognized (File No. LR29862-99) SPECIAL PURPOSE FUSES L15S series and L25S series fuses are Littelfuse Certified for DC ratings shown in Ratings Table. AMPERE RATINGS See Rating Table. RECOMMENDED FUSE BLOCKS LSCR series:Refer to Fuse Block section of this catalog for additional information. 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.” 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. 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. 72 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. Semiconductor Fuses 150/250/500/600/700 VAC ■ Very Fast-Acting ■ 1 – 1000 Amperes RATING TABLE Series & Voltage Ampere Ratings 1 2 3 4 5 6 7 8 9 10 12 15 171⁄2 20 25 30 35 40 45 50 60 70 80 90 100 110 125 150 175 200 225 250 275 300 350 400 450 500 550 600 700 800 900 1000 L15S L25S 150V AC 250V AC 150V DC (1 – 60A) 250V DC (1 – 200A) 100V DC (70 – 1000A) 200V DC (225 – 800A) L50S L60S KLC‡ L70S 500V AC 450V DC 600V AC 600V AC 700V AC 650V DC L15S 1 L15S 2 L15S 3 L15S 4 L15S 5 L15S 6 L15S 7 L15S 8 L15S 9 L15S 10 L15S 12 L15S 15 L25S 1 L25S 2 L25S 3 L25S 4 L25S 5 L25S 6 L60S 1 L60S 2 L60S 3 L60S 4 L60S 5 L60S 6 L25S 8 L60S 8 L25S 10 L25S 12 L25S 15 L50S 10 L50S 12 L50S 15 L15S 20 L15S 25 L15S 30 L15S 35 L15S 40 L15S 45 L15S 50 L15S 60 L15S 70 L15S 80 L15S 90 L15S 100 L25S 20 L25S 25 L25S 30 L25S 35 L25S 40 L25S 45 L25S 50 L25S 60 L25S 70 L25S 80 L25S 90 L25S 100 L50S 20 L50S 25 L50S 30 L50S 35 L50S 40 L15S 125 L15S 150 L25S 125 L25S 150 L25S 175 L25S 200 L25S 225 L25S 250 L25S 275 L25S 300 L25S 350 L25S 400 L25S 450 L25S 500 L15S 200 L15S 250 L15S 300 L15S 350 L15S 400 L15S 450 L15S 500 L15S 600 L15S 800 L25S 600 L25S 700 L25S 800 L50S 50 L50S 60 L50S 70 L50S 80 L50S 90 L50S 100 L50S 125 L50S 150 L50S 175 L50S 200 L50S 225 L50S 250 L50S 275 L50S 300 L50S 350 L50S 400 L50S 450 L50S 500 L50S 550 L50S 600 L50S 700 L50S 800 L60S 10 L60S 12 L60S 15 L60S 171⁄2 L60S 20 L60S 25 L60S 30 L60S 35 L60S 40 L60S 45 L60S 50 L60S 60 L60S 70 L60S 80 L60S 90 L60S 100 KLC 1 KLC 2 KLC 3 KLC 4 KLC 5 KLC 6 KLC 7 KLC 8 L60S 125 L60S 150 L60S 175 L60S 200 L60S 225 L60S 250 KLC 10 KLC 12 KLC 15 KLC 171⁄2 KLC 20 KLC 25 KLC 30 KLC 35 KLC 40 KLC 45 KLC 50 KLC 60 KLC 70 KLC 80 KLC 90 KLC 100 KLC 110 KLC 125 KLC 150 KLC 175 KLC 200 KLC 225 KLC 250 L70S 10 L60S 300 L60S 350 L60S 400 L60S 450 L60S 500 KLC 300 KLC 350 KLC 400 KLC 450 KLC 500 L70S 300 L70S 350 L70S 400 L70S 450 L70S 500 L60S 600 L60S 700 L60S 800 KLC 600 KLC 700 KLC 800 L70S 600 L70S 700 L70S 800 SPECIAL PURPOSE FUSES L70S 15 L70S 20 L70S 25 L70S 30 L70S 35 L70S 40 L70S 50 L70S 60 L70S 70 L70S 80 L70S 90 L70S 100 L70S 125 L70S 150 L70S 175 L70S 200 L70S 225 L70S 250 L15S 1000 ‡ KLC series fuses are recommended for replacement use only. 73 Semiconductor Fuses 150/250/500/600/700 VAC ■ Very Fast-Acting ■ 1 – 1000 Amperes L15S SERIES, 150* VOLTS AC (Replaces KLA, KLW, L13S) AMPERE RATING DIMENSIONS IN INCHES (mm in parentheses) FIG. NO. A B C D E F G H — 3/8 (9.5) 13/32 (10.3) — — — — 1 – 30 1 1-1/2 (38.1) 31 – 60 1 2 (50.8) — 5/8 (15.9) 13/16 (20.6) — — — — 61 – 450 3 1-5/32 (29.4) 1-7/8 (47.6) 2-3/16 (55.6) 2-21/32 (67.5) 1 (25.4) 43/64 (17.1) 5/16 (7.9) 3/16 (4.8) 451 – 1000 3 1-1/4 (31.8) 1-15/16 (49.2) 2-9/16 (65.1) 3-1/2 (88.9) 1-1/2 (38.1) 1 (25.4) 13/32 (10.3) 1/4 (6.4) L25S SERIES, 250 VOLTS AC (Replaces KLB) AMPERE RATING SPECIAL PURPOSE FUSES FIG. NO. DIMENSIONS IN INCHES (mm in parentheses) A B C D E F G H — 1/2 (12.7) 9/16 (14.3) — — — — 1 – 30 1 2 (50.8) 31 – 60 2 1-5/8 (41.3) 2-1/4 (57.2) 2-1/2 (63.5) 3-3/16 (81.0) 13/16 (20.6) 23/32 (18.3) 11/32 (8.7) 1/8 (3.2) 61 – 200 3 1-5/8 (41.3) 2-5/16 (58.7) 2-7/16 (61.9) 3-1/8 (79.4) 1-7/32 (31.0) 1 (25.4) 5/16 (7.9) 3/16 (4.8) 201 – 700 3 1-19/32 (40.5) 2-9/32 (57.9) 2-29/32 3-27/32 (73.8) (97.6) 1-1/2 (38.1) 1 (25.4) 13/32 (10.3) 1/4 (6.4) 701 – 800 3 1-19/32 (40.5) 2-9/32 (57.9) 2-29/32 3-27/32 (73.8) (97.6) 2 (50.8) 1-1/2 (38.1) 13/32 (10.3) 1/4 (6.4) L50S SERIES, 500 VOLTS AC / 450 VOLTS DC (Replaces KLH) DIMENSIONS IN INCHES (mm in parentheses) AMPERE RATING FIG. NO. A B C D E F G H 10 – 30 1 2 (50.8) — 1/2 (12.7) 9/16 (14.3) — — — — 31 – 60 2 1-5/8 (41.3) 2-1/4 (57.2) 2-1/2 (63.5) 3-3/16 (81.0) 13/16 (20.6) 23/32 (18.3) 11/32 (8.7) 1/8 (3.2) 61 – 100 3 2-1/8 (54.0) 2-11/16 (68.3) 3-1/32 (77.0) 3-5/8 (92.1) 1 (25.4) 3/4 (19.1) 11/32 (8.7) 1/8 (3.2) 101 – 200 3 2-1/8 (54.0) 2-13/16 2-15/16 (71.4) (74.6) 3-5/8 (92.1) 1-7/32 (31.0) 1 (25.4) 5/16 (7.9) 3/16 (4.8) 201 – 400 3 2-3/32 (53.2) 2-25/32 3-13/32 4-11/32 (70.6) (86.5) (110.3) 1-1/2 (38.1) 1 (25.4) 13/32 (10.3) 1/4 (6.4) 401 – 600 3 2-7/32 (56.4) 2-29/32 3-17/32 4-15/32 (73.8) (89.7) (113.5) 2 (50.8) 1-1/2 (38.1) 13/32 (10.3) 1/4 (6.4) 601 – 800 3 2-7/32 (56.4) 4-9/32 (108.7) 2-1/2 (63.5) 2 (50.8) 17/32 (13.5) 3/8 (9.5) D 6-15/32 (164.3) F G C A Fig. 1 74 4-5/8 (117.5) A B C D Fig, 2 H E Semiconductor Fuses 150/250/500/600/700 VAC ■ Very Fast-Acting ■ 1 – 1000 Amperes L60S SERIES, 600 VOLTS AC DIMENSIONS IN INCHES (mm in parentheses) AMPERE RATING FIG. NO. A B C D E F G H 1 – 30 1 5 (127.0) — 5/8 (15.9) 13/16 (20.6) — — — — 31 – 60 2 2-25/32 (70.6) 3-7/16 (87.3) 3-11/16 4-3/8 (93.7) (111.1) 13/16 (20.6) 23/32 (18.3) 11/32 (8.7) 1/8 (3.2) 61 – 100 2 2-29/32 3-17/32 3-25/32 4-15/32 (73.8) (89.7) (96.0) (113.5) 1-1/16 (27.0) 23/32 (18.3) 11/32 (8.7) 1/8 (3.2) 101 – 200 2 2-29/32 (73.8) 3-9/16 (90.5) 3-3/4 (95.3) 4-13/32 (111.9) 1-5/16 (33.3) 1 (25.4) 5/16 (7.9) 3/16 (4.8) 201 – 400 2 2-29/32 3-31/32 (73.8) (100.8) 4-5/32 (105.6) 5-1/8 (130.2) 1-37/64 (40.1) 1 (25.4) 13/32 (10.3) 1/4 (6.4) 401 – 600 2 2-7/8 (73.0) 3-31/32 (100.8) 4-9/64 (105.2) 5-1/8 (130.2) 2-1/16 (52.8) 1-1/2 (38.1) 13/32 (10.3) 1/4 (6.4) 601 – 800 2 3-1/32 (77.0) 5-5/32 (133.4) 5-11/32 7-1/4 (135.7) (184.2) 2-1/2 (63.5) 2 (50.8) 17/32 (13.5) 3/8 (9.5) L70S SERIES, 700 VOLTS AC / 650 VOLTS DC DIMENSIONS IN INCHES (mm in parentheses) FIG. NO. AMPERE RATING A B C D E F G H J — 1/2 (12.7) 9/16 (14.3) — — — — — 10 – 30 1 2 (50.8) 31 – 60 3 2-7/8 (73.0) 3-7/16 3-25/32 4-3/8 1 (87.3) (96.0) (111.1) (25.4) 43/64 (17.1) 11/32 (8.7) 1/8 (3.2) — 61 – 100 3 2-7/8 (73.0) 3-9/16 3-11/16 4-3/8 1-7/32 (90.5) (93.7) (111.1) (31.0) 29/32 (22.9) 5/16 (7.9) 3/16 (4.8) — 101 – 200 3 2-27/32 3-17/32 4-5/32 5-3/32 1-1/2 (72.2) (89.7) (105.6) (129.4) (38.1) 1 (25.4) 13/32 (10.3) 1/4 (6.4) — 201 – 400 3 2-27/32 3-17/32 4-5/32 5-3/32 (72.2) (89.7) (105.6) (129.4) 2 (50.8) 1-1/2 (38.1) 13/32 (10.3) 1/4 (6.4) — 401 – 600 3 2-27/32 4-29/32 5-1/4 7-3/32 2-1/2 (72.2) (124.6) (133.4) (180.2) (63.5) 2 (50.8) 17/32 (13.5) 3/8 (9.5) — 601 – 800 4 3-5/16 5-5/16 6-13/16 (84.1) (134.9) (173.0) 2 (50.8) 5/8 (15.9) 3/8 (9.5) 5/16 (7.9) — 2-7/8 (73.0) SPECIAL PURPOSE FUSES KLC SERIES, 600 VOLTS AC FIG. NO. AMPERE RATING DIMENSIONS IN INCHES (mm in parentheses) A B C D E F G H 2-1/2 (63.5) — 2-7/8 (73.0) 9/16 (14.3) 13/32 (10.3) 1/4 (6.4) 3/64 (1.2) 1 – 30 2 1-7/8 (47.6) 31 – 60 2 2-3/4 (69.9) 3-3/8 (85.7) 3-5/8 (92.1) 4-5/16 (109.5) 13/16 (20.6) 23/32 (18.3) 11/32 (8.7) 1/8 (3.2) 61 – 100 3 2-7/8 (73.0) 3-21/32 (92.9) 4-1/16 (103.2) 5 (127.0) 1 (25.4) 3/4 (19.1) 13/32 (10.3) 1/8 (3.2) 101 – 200 3 2-27/32 3-17/32 (72.2) (89.7) 4-3/8 (111.1) 5-3/32 (129.4) 1-1/2 (38.1) 1 (25.4) 13/32 (10.3) 1/4 (6.4) 201 – 400 3 2-27/32 4-21/32 4-27/32 6-1/4 (72.2) (118.3) (123.0) (158.8) 2 (50.8) 1-5/8 (41.3) 9/16 (14.3) 1/4 (6.4) 401 – 800 3 2-27/32 4-21/32 5-11/32 6-1/4 (72.2) (118.3) (135.7) (158.8) 2-1/2 (63.5) 2 (50.8) 9/16 (14.3) 3/8 (9.5) F F G A B C D Fig. 3 H E G A B C J H E Fig. 4 75