L50S010.T

L50S LITTELFUSE | Alldatasheet

Document overview

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Technical content

littelfuse.com © 2015 Littelfuse POWR-GARD® Products Rev: 082615 1 of 7 POWR-GARD® Fuse Datasheet Specifications Voltage Rating 500 Vac

450 Vdc

Amperage Rating 10, 12, 15, 20, 25, 30, 35, 40, 50, 60, 70, 80, 90, 100, 125, 150, 175, 200, 225, 250, 275, 300, 350, 400, 450, 500, 550, 600, 700, 800 Interrupting Rating AC: 200 kAIC DC: 20 kAIC Material Body: Melamine Terminals: Copper (silver plated) Mounting Type Cylindrical (10 - 30 A) Bolted Tags (35 - 800 A) Operating Temperature -55 ˚ C to +125˚ C Storage Temperature Up to 35˚ C with relative humidity less than 65% Approvals UL Recognized (File: E71611) CSA Recognized (File: LR29862) Environmental RoHS Compliant Country of Origin Mexico

Description

Littelfuse L50S Series High-Speed Fuses are designed to protect today’s equipment and systems, and are manufactured with Littelfuse-developed technology that sets tomorrow’s standards for accuracy, consistent quality, reliability, and predictable performance. Littelfuse engineers have redefined High-Speed Fuse Technology by using advanced metallurgical, polymer, and materials research, mathematical modeling, and computerized statistical analysis. Features/Benefits

• Extremely Current Limiting
• Low Watt Losses
• Controlled Transient Over-voltages
• UL Recognized

Applications

• AC & DC Drives
• DC Common Bus Protection
• Power Converters
• UPS
• Soft-Starters Recommended Fuse Holder LSCR001 (35-200 A) LSCR002 (225-800 A) Web Resources Download technical documents: littelfuse.com/L50S L50S SERIES HIGH-SPEED FUSE

500 Vac • 450 Vdc • 10-800 A • Traditional Round Body Style

SERIES AMP CATALOG NUMBER ORDERING NUMBER L50S 10 L50S010 L50S010.T L50S 500 L50S500 L50S500.X Part Numbering System L50S xxx .T Package Quantity Series Amp Code Refer to Amp Code Column in Ordering Information Table Refer to Pack Qty. Column in Ordering Information Table

littelfuse.com © 2015 Littelfuse POWR-GARD® Products Rev: 082615 2 of 7 POWR-GARD® Fuse Datasheet Dimensions SERIES AMPERAGE RATING AMP CODE CATALOG NUMBER ORDERING NUMBER PACK QUANTITY UPC L50S 10 010 L50S010 L50S010.T 10 Pcs/ Box 07945885010 L50S 12 012 L50S012 L50S012.T 10 Pcs/ Box 07945885012 L50S 15 015 L50S015 L50S015.T 10 Pcs/ Box 07945885015 L50S 20 020 L50S020 L50S020.T 10 Pcs/ Box 07945885020 L50S 25 025 L50S025 L50S025.T 10 Pcs/ Box 07945885025 L50S 30 030 L50S030 L50S030.T 10 Pcs/ Box 07945885030 L50S 35 035 L50S035 L50S035.T 10 Pcs/ Box 07945885035 L50S 40 040 L50S040 L50S040.T 10 Pcs/ Box 07945885040 L50S 50 050 L50S050 L50S050.T 10 Pcs/ Box 07945885050 L50S 60 060 L50S060 L50S060.T 10 Pcs/ Box 07945885060 L50S 70 070 L50S070 L50S070.T 10 Pcs/ Box 07945885070 L50S 80 080 L50S080 L50S080.T 10 Pcs/ Box 07945885080 L50S 90 090 L50S090 L50S090.T 10 Pcs/ Box 07945885090 L50S 100 100 L50S100 L50S100.T 10 Pcs/ Box 07945885100 L50S 125 125 L50S125 L50S125.V 5 Pcs/ Box 07945885125 L50S 150 150 L50S150 L50S150.V 5 Pcs/ Box 07945885150 L50S 175 175 L50S175 L50S175.V 5 Pcs/ Box 07945885175 L50S 200 200 L50S200 L50S200.V 5 Pcs/ Box 07945885200 L50S 225 225 L50S225 L50S225.V 5 Pcs/ Box 07945885225 L50S 250 250 L50S250 L50S250.V 5 Pcs/ Box 07945885250 L50S 275 275 L50S275 L50S275.V 5 Pcs/ Box 07945885275 L50S 300 300 L50S300 L50S300.V 5 Pcs/ Box 07945885300 L50S 350 350 L50S350 L50S350.V 5 Pcs/ Box 07945885350 L50S 400 400 L50S400 L50S400.V 5 Pcs/ Box 07945885400 L50S 450 450 L50S450 L50S450.X 1 Pc/ Box 07945885450 L50S 500 500 L50S500 L50S500.X 1 Pc/ Box 07945885500 L50S 550 550 L50S550 L50S550.X 1 Pc/ Box 07945885550 L50S 600 600 L50S600 L50S600.X 1 Pc/ Box 07945885600 L50S 700 700 L50S700 L50S700.X 1 Pc/ Box 07945885700 L50S 800 800 L50S800 L50S800.X 1 Pc/ Box 07945885800

Ordering Information

L50S SERIES HIGH-SPEED FUSE AMPERE RATING FIGURE NO. DIMENSIONS INCHES ( mm) A B C D E F G H A B C D F G E H Fig. 3 A C D Fig. 1 Figure 1 Figure 2 Figure 3 E H F G A B C D Fig, 2

littelfuse.com © 2015 Littelfuse POWR-GARD® Products Rev: 082615 3 of 7 POWR-GARD® Fuse Datasheet Electrical Specifications CATALOG NUMBER AMPERAGE RATING VOLTAGE RATING INTERRUPT RATING MELTING (PRE-ARC) I2T (A2s) TOTAL CLEARING I2T (A2s) TOTAL CLEARING I2T (A2s) TOTAL CLEARING I2T (A2s) WATTS LOSS AT 100% RATED CURRENT WATTS LOSS AT 80% RATED CURRENT AC DC AC DC 100 kA @ 500 Vac 200 kA @ 500 Vac 20 kA @ 450 Vdc (W) (W) L50S010 10 500 450 200kA 20kA 21 112 128 85 2 1 L50S012 12 500 450 200kA 20kA 26 149 170 97 2 1 L50S015 15 500 450 200kA 20kA 34 222 250 116 2 2 L50S020 20 500 450 200kA 20kA 48 363 400 143 5 3 L50S025 25 500 450 200kA 20kA 62 528 600 170 7 4 L50S030 30 500 450 200kA 20kA 77 707 820 193 10 5 L50S035 35 500 450 200kA 20kA 130 1,120 1,210 400 6 3 L50S040 40 500 450 200kA 20kA 161 1,420 1,550 525 7 4 L50S050 50 500 450 200kA 20kA 222 2,150 2,360 867 11 6 L50S060 60 500 450 200kA 20kA 259 3,016 3,300 1,287 13 7 L50S070 70 500 450 200kA 20kA 420 4,100 4,930 1,670 17 10 L50S080 80 500 450 200kA 20kA 554 5,300 6,950 2,240 19 10 L50S090 90 500 450 200kA 20kA 677 6,750 9,500 2,900 24 13 L50S100 100 500 450 200kA 20kA 807 8,273 12,600 3,626 30 16 L50S125 125 500 450 200kA 20kA 1,290 13,100 19,000 5,150 22 12 L50S150 150 500 450 200kA 20kA 2,504 19,100 26,500 6,700 27 15 L50S175 175 500 450 200kA 20kA 3,224 26,300 35,000 8,700 33 17 L50S200 200 500 450 200kA 20kA 3,938 34,233 44,583 11,297 35 19 L50S225 225 500 450 200kA 20kA 6,034 43,500 56,000 14,750 31 17 L50S250 250 500 450 200kA 20kA 7,510 54,000 69,000 19,600 36 19 L50S275 275 500 450 200kA 20kA 9,000 65,500 82,000 25,500 41 22 L50S300 300 500 450 200kA 20kA 10,808 78,500 97 ,500 32,200 42 23 L50S350 350 500 450 200kA 20kA 16,500 107 ,000 132,000 50,100 50 28 L50S400 400 500 450 200kA 20kA 22,941 142,333 169,667 72,270 58 30 L50S450 450 500 450 200kA 20kA 29,300 178,500 208,000 95,000 58 32 L50S500 500 500 450 200kA 20kA 37 ,000 220,000 250,000 118,000 64 35 L50S550 550 500 450 200kA 20kA 45,851 311,667 347 ,333 176,766 75 41 L50S600 600 500 450 200kA 20kA 45,851 311,667 347 ,333 176,766 98 50 L50S700 700 500 450 200kA 20kA 82,396 460,000 622,333 289,000 96 51 L50S800 800 500 450 200kA 20kA 115,656 6 47,6 67 687 ,500 465,590 118 60 L50S SERIES HIGH-SPEED FUSE

littelfuse.com © 2015 Littelfuse POWR-GARD® Products Rev: 082615 4 of 7 POWR-GARD® Fuse Datasheet Recommended T orque Values For Bus Bar Mounting T emperature De-rating Curve (T emperature of Air Immediately Surrounding Fuse) PERCENT OF UPRATING PERCENT OF DOWNRATING AMBIENT TEMPERATURE 0 0 -60˚ C -40˚ C -20˚ C 0˚ C 20˚ C 40˚ C 60˚ C 80˚ C 100˚ C 120˚ C 140˚ C -76˚ F -40˚ F -4˚ F -32˚ F 68˚ F 104˚ F 140˚ F 176˚ F 212˚ F 248˚ F 284˚ F RECOMMENDED TORQUE VALUES FOR BUS BAR MOUNTING FUSE CATALOG NUMBER FUSE TORQUE–METRIC (STANDARD) HARDWARE SIZE–METRIC (STANDARD) L50S035 15 N m (132.76 in-lb) M8 (5/16") L50S040 15 N m (132.76 in-lb) M8 (5/16") L50S050 15 N m (132.76 in-lb) M8 (5/16") L50S060 15 N m (132.76 in-lb) M8 (5/16") L50S070 15 N m (132.76 in-lb) M8 (5/16") L50S080 15 N m (132.76 in-lb) M8 (5/16") L50S090 15 N m (132.76 in-lb) M8 (5/16") L50S100 15 N m (132.76 in-lb) M8 (5/16") L50S125 8 N m (70.81 in-lb) M6 (1/4") L50S150 8 N m (70.81 in-lb) M6 (1/4") L50S175 8 N m (70.81 in-lb) M6 (1/4") L50S200 8 N m (70.81 in-lb) M6 (1/4") L50S225 15 N m (132.76 in-lb) M8 (5/16") L50S250 15 N m (132.76 in-lb) M8 (5/16") L50S275 15 N m (132.76 in-lb) M8 (5/16") L50S300 15 N m (132.76 in-lb) M8 (5/16") L50S350 15 N m (132.76 in-lb) M8 (5/16") L50S400 15 N m (132.76 in-lb) M8 (5/16") L50S450 15 N m (132.76 in-lb) M8 (5/16") L50S500 15 N m (132.76 in-lb) M8 (5/16") L50S550 15 N m (132.76 in-lb) M8 (5/16") L50S600 15 N m (132.76 in-lb) M8 (5/16") L50S700 54 N m (477.94 in-lb) M12 (1/2") L50S800 54 N m (477.94 in-lb) M12 (1/2") L50S SERIES HIGH-SPEED FUSE

littelfuse.com © 2015 Littelfuse POWR-GARD® Products Rev: 082615 5 of 7 POWR-GARD® Fuse Datasheet Time Current Curves L50S SERIES HIGH-SPEED FUSE 1009080 1009080 1000009000080000 70000 60000 50000 40000 30000 20000 1000090008000 7000 6000 5000 4000 3000 2000 1000900800 700 600 500 400 300 200 1009080 1098 1098 1098 10.90.8 0.7 0.6 0.5 10.90.8 0.7 0.6 0.5 nds - 30A - 25A 0.4 0.3 0.2 0.10.090.08 0.07 0.06 0.05 0 04 0.4 0.3 0.2 0.10.090.08 0.07 0.06 0.05 0 04 re‐arcing) Time in Seco - 20A - 15A - 12A 0.04 0.03 0.02 0.010.00900.0080 0.0070 0.0060 0.0050 0.0040 0.04 0.03 0.02 0.010.00900.0080 0.0070 0.0060 0.0050 0.0040 Melting (P 0.0030 0.0020 0.00100.00090.0008 0.0007 0.0006 0.0005 0.0004 0.0030 0.0020 0.00100.00090.0008 0.0007 0.0006 0.0005 0.0004 0.0003 0.0002 0.0001 0.0003 0.0002 0.0001 1000009000080000 70000 60000 50000 40000 30000 20000 1000090008000 7000 6000 5000 4000 3000 2000 1000900800 700 600 500 400 300 200 1009080 1098 Prospective R.M.S Current in Ampere BASIS FOR DATA: TEST VOLTAGE: 500V TIME CONSTANT/POWER FACTOR: FUSE CATALOG NUMBER: DRAWN BY: DATE: REVISION: DRAWING NO.: SHEET TIME CURRENT CHARACTERISTIC CURVES LITTELFUSE, INC. CHICAGO, IL. USA LLL 1/28/2015 A

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• THIS DATA IS GENERATED IN EXCEL - TIME CURRENT CHARACTERISTIC CURVES FCC01 L50S 1009080 1009080 200000 100000 90000 80000 70000 60000 50000 40000 30000 20000 10000 9000 8000 7000 6000 5000 4000 3000 2000 1000 900 800 700 600 500 400 300 200 100 1098 1098 - 600A - 500A - 450A 10.90.8 0.7 0.6 0.5 0.4 10.90.8 0.7 0.6 0.5 0.4 onds - 200A - 175A - 150A - 125A 0.3 0.2 0.10.090.08 0.07 0.06 0.05 0.04 0.3 0.2 0.10.090.08 0.07 0.06 0.05 0.04 Pre‐arcing) Time in Seco 0.03 0.02 0.010.0090.008 0.007 0.006 0.005 0.004 0 003 0.03 0.02 0.010.0090.008 0.007 0.006 0.005 0.004 0 003 Melting (P 0.003 0.002 0.0010.00090.0008 0.0007 0.0006 0.0005 0.0004 0.0003 0.003 0.002 0.0010.00090.0008 0.0007 0.0006 0.0005 0.0004 0.0003 0.0002 0.0001 0.0002 0.0001 200000 100000 90000 80000 70000 60000 50000 40000 30000 20000 10000 9000 8000 7000 6000 5000 4000 3000 2000 1000 900 800 700 600 500 400 300 200 100 Prospective R.M.S Current in Ampere BASIS FOR DATA: TEST VOLTAGE: 500V TIME CONSTANT/POWER FACTOR: FUSE CATALOG NUMBER: DRAWN BY: DATE: REVISION: DRAWING NO.: SHEET TIME CURRENT CHARACTERISTIC CURVES LITTELFUSE, INC. CHICAGO, IL. USA LLL 1/28/2015 A

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• THIS DATA IS GENERATED IN EXCEL - TIME CURRENT CHARACTERISTIC CURVES FCC01 L50S 1009080 1009080 1000009000080000 70000 60000 50000 40000 30000 20000 1000090008000 7000 6000 5000 4000 3000 2000 1000900800 700 600 500 400 300 200 1009080 1098 1098 1098 10.90.8 0.7 0.6 0.5 10.90.8 0.7 0.6 0.5 nds - 60A - 50A - 40A 0.4 0.3 0.2 0.10.090.08 0.07 0.06 0.05 0.04 0.4 0.3 0.2 0.10.090.08 0.07 0.06 0.05 0.04 re‐arcing) Time in Seco - 10A - 35A 0.03 0.02 0.010.0090.008 0.007 0.006 0.005 0.004 0.03 0.02 0.010.0090.008 0.007 0.006 0.005 0.004 Melting (P 0.003 0.002 0.0010.00090.0008 0.0007 0.0006 0.0005 0.0004 0 0003 0.003 0.002 0.0010.00090.0008 0.0007 0.0006 0.0005 0.0004 0 00030.0003 0.0002 0.0001 0.0003 0.0002 0.0001 1000009000080000 70000 60000 50000 40000 30000 20000 1000090008000 7000 6000 5000 4000 3000 2000 1000900800 700 600 500 400 300 200 1009080 1098 Prospective R.M.S Current in Ampere BASIS FOR DATA: TEST VOLTAGE: 500V TIME CONSTANT/POWER FACTOR: FUSE CATALOG NUMBER: DRAWN BY: DATE: REVISION: DRAWING NO.: SHEET TIME CURRENT CHARACTERISTIC CURVES LITTELFUSE, INC. CHICAGO, IL. USA LLL 1/28/2015 A

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• THIS DATA IS GENERATED IN EXCEL - TIME CURRENT CHARACTERISTIC CURVES FCC01 L50S 1009080 1009080 200000 100000 90000 80000 70000 60000 50000 40000 30000 20000 10000 9000 8000 7000 6000 5000 4000 3000 2000 1000 900 800 700 600 500 400 300 200 100 1098 1098 - 800A - 700A - 400A - 350A - 300A - 275A4 10.90.8 0.7 0.6 0.5 0.4 10.90.8 0.7 0.6 0.5 0.4 nds 275A - 250A - 225A - 100A - 90A - 80A 70A0.3 0.2 0.10.090.08 0.07 0.06 0.05 0.04 0.3 0.2 0.10.090.08 0.07 0.06 0.05 0.04 re‐arcing) Time in Seco - 70A 0.03 0.02 0.010.0090.008 0.007 0.006 0.005 0.004 0 003 0.03 0.02 0.010.0090.008 0.007 0.006 0.005 0.004 0 003 Melting (P 0.003 0.002 0.0010.00090.0008 0.0007 0.0006 0.0005 0.0004 0.0003 0.003 0.002 0.0010.00090.0008 0.0007 0.0006 0.0005 0.0004 0.0003 0.0002 0.0001 0.0002 0.0001 200000 100000 90000 80000 70000 60000 50000 40000 30000 20000 10000 9000 8000 7000 6000 5000 4000 3000 2000 1000 900 800 700 600 500 400 300 200 100 Prospective R.M.S Current in Ampere BASIS FOR DATA: TEST VOLTAGE: 500V TIME CONSTANT/POWER FACTOR: FUSE CATALOG NUMBER: DRAWN BY: DATE: REVISION: DRAWING NO.: SHEET TIME CURRENT CHARACTERISTIC CURVES LITTELFUSE, INC. CHICAGO, IL. USA LLL 1/28/2015 A

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• THIS DATA IS GENERATED IN EXCEL - CU C C SC CU S FCC01 L50S

littelfuse.com © 2015 Littelfuse POWR-GARD® Products Rev: 082615 6 of 7 POWR-GARD® Fuse Datasheet L50S SERIES HIGH-SPEED FUSE Peak Let-Thru Curve T otal Clearing I2t Correction Factor Curve Watts Loss Correction Factor Curve Peak Arc Voltage Curve 100,000 90,000 80,000 70,000 60,000 50,000 40,000 30,000 20,000 10,000 9,000 8,000 7,000 6,000 5,000 4,000 3,000 2,000 1,000 900 800 700 600 500 400 100,000 90,000 80,000 70,000 60,000 50,000 40,000 30,000 20,000 10,000 9,000 8,000 7,000 6,000 5,000 4,000 3,000 2,000 1,000 900 800 700 600 500 400 200,000 100,00090,000 80,000 70,000 60,000 50,000 40,000 30,000 20,000 10,0009,000 8,000 7,000 6,000 5,000 4,000 3,000 2,000 1,000900 800 700 600 500 400 300 200 10090 PEAK LET- THRU IN AMPERES 800A - 600A - 400A - 200A - 100A - 60A - 30A - 10A - 300 200 100 300 200 100 200,000 100,00090,000 80,000 70,000 60,000 50,000 40,000 30,000 20,000 10,0009,000 8,000 7,000 6,000 5,000 4,000 3,000 2,000 1,000900 800 700 600 500 400 300 200 10090 AVAILABLE FAULT CURRENT SYMMETRICAL R.M.S. AMPERES BASIS FOR DATA: TEST VOLTAGE: 500V TIME CONSTANT/POWER FACTOR: FUSE CATALOG NUMBER: DRAWN BY: DATE: REVISION: DRAWING NO.: SHEET PEAK LET‐THRU CHARACTERISTIC CURVES LITTELFUSE, INC. CHICAGO, IL. USA LLL 02/10/2015 A

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• DATA GENERATED IN EXCEL - 0.9 0.9 500 400 300 200 100 0.8 0.7 0.6 0.8 0.7 0.6 0.5 0.4 0.5 0.4 tortor 0.3 0.3 aring I2t Correction Factaring I2t Correction Fact - 10A - 30A - 35A - 800A 0.2 0.2 Total CleaTotal Clea 0.1 0.1 500 400 300 200 100 Operating Voltage in Volt BASIS FOR DATA: TEST VOLTAGE: TIME CONSTANT/POWER FACTOR: FUSE CATALOG NUMBER: DRAWN BY: DATE: REVISION: DRAWING NO.: SHEET I2T CORRECTION FACTOR LITTELFUSE, INC. CHICAGO, IL. USA LLL 01/26/2015 A

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L50S 35-800ABASIS FOR DATA: TEST VOLTAGE: 100V - 500V TIME CONSTANT/POWER FACTOR: FUSE CATALOG NUMBER: DRAWN BY: DATE: REVISION: DRAWING NO.: SHEET I2T CORRECTION FACTOR LITTELFUSE, INC. CHICAGO, IL. USA LLL 01/26/2015 A

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• THIS DATA IS GENERATED IN EXCEL - I2T CORRECTION FACTOR FCC0I2T CORRECTION FACTOR L50S I2T CORRECTION 0.9 0.9 100 0.8 0.7 0.6 0.8 0.7 0.6 0.5 0.4 0.5 0.4 or 0.3 0.3 Loss Correction Facto - 10A - 800A 0.2 0.2 Watts L 0.1 0.1 100 Percent of Rated Current BASIS FOR DATA: TEST VOLTAGE: TIME CONSTANT/POWER FACTOR: FUSE CATALOG NUMBER: DRAWN BY: DATE: REVISION: DRAWING NO.: SHEET I2T CORRECTION FACTOR LITTELFUSE, INC. CHICAGO, IL. USA LLL 01/26/2015 A

L50S 35-800ABASIS FOR DATA: TEST VOLTAGE: 500V TIME CONSTANT/POWER FACTOR: FUSE CATALOG NUMBER: DRAWN BY: DATE: REVISION: DRAWING NO.: SHEET WATTS LOSS CORRECTION LITTELFUSE, INC. CHICAGO, IL. USA LLL 02/03/2015 A L50S WATTS LOSS CORRECTION L50S 10A-800A - THIS DATA IS GENERATED IN EXCEL - I2T CORRECTION FACTOR FCC0WATTS LOSS CORRECTION L50S WATTS LOSS CORRECTION 1000 900 1000 900 500 400 300 200 100 800 700 600 800 700 600 500 400 500 400 - 10A - 30A 300 300 ak Arc Voltage in Volt - 35A - 200A - 225A - 800A 200 200 Pea 100 100 500 400 300 200 100 Operating Voltage in Volts BASIS FOR DATA: TEST VOLTAGE: TIME CONSTANT/POWER FACTOR: FUSE CATALOG NUMBER: DRAWN BY: DATE: REVISION: DRAWING NO.: SHEET ARC VOLTAGE LITTELFUSE, INC. CHICAGO, IL. USA LLL 01/26/2015 A L70S 35-800ABASIS FOR DATA: TEST VOLTAGE: TIME CONSTANT/POWER FACTOR: FUSE CATALOG NUMBER: DRAWN BY: DATE: REVISION: DRAWING NO.: SHEET ARC VOLTAGE LITTELFUSE, INC. CHICAGO, IL. USA LLL 01/26/2015 A

• THIS DATA IS GENERATED IN EXCEL -

littelfuse.com © 2015 Littelfuse POWR-GARD® Products Rev: 082615 7 of 7 POWR-GARD® Fuse Datasheet Disclaimer Notice - Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. Littelfuse.com/Product-Disclaimer L50S SERIES HIGH-SPEED FUSE