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PSX1XLFL0080X
Fuse, Semiconductor, Flush Metric, POWR-SPEED PSX Series, 80 A, Very Fast Acting
⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.
- Manufacturer: LITTELFUSE
- Product type: Semiconductor Fuses
- SVHC: To Be Advised
- Fuse Current: 80A
- Product Range: POWR-SPEED PSX Series
- Fuse Size Metric: 126.7mm x 51.5mm x 57.5mm
- Fuse Size Imperial: 4.99" x 2.03" x 2.26"
- Voltage Rating VAC: -
- Voltage Rating VDC: 1.5kV
- Blow Characteristic: Very Fast Acting
| Delivery and price | |
|---|---|
| Units per pack | 1 |
| Price | 269.67 € |
| Current stock | 10+ |
| Lead time | 30 days |
Datasheet
**POWR-** _**SPEED**_ **[®] Fuse** PSX SERIES HIGH-SPEED SQUARE BODY Battery Protection Fuses • 1500 V Dc Class aBat • 80 A–1400 A ## **Specifications** ## **Description** Littelfuse PSX series 1500 V dc high-speed square body fuses are specially designed to protect battery energy storage systems (BESS), photovoltaic inverters, and many dc applications such as dc common bus systems, larger industrial regenerative drives, rectifiers and metal processing equipment. The PSX series fuses are extremely fast-acting, offering high-speed performance up to 1500 V dc, ranging from 80 A to 1400 A in the smallest NH XL package sizes. The PSX series is available with multiple mounting terminations including flush-end, DIN, and bolted-blade styles. Visual blown fuse indication is standard on all fuses and optional micro-switch is available for external indication. The PSX series is certified to UL248-13 and designed to meet IEC 60269-7 (Class aBat) battery protection fuse standard. ## **Features/Benefits** High dc voltage rating up to 1500 V dc Dc interrupting rating is 250 kA Extremely fast acting for high speed performance Low watt loss provides energy efficiency for BESS applications Compact NH 1XL and 3XL sizes offer flexibility **Voltage Rating** Dc: 1500 V **Amperage Rating** 80 A–1400 A **Interrupting Rating** Dc: 250 kA **Time Constant** 1XL: </= 3 ms 3XL: </= 5 ms **Microswitch** Yes **Mounting** Bolted-blade style, DIN-blade style, Metric flush-end style **Material** Body: ceramic Contacts: plated copper (bladed) plated brass (flush end) **Approvals** cURus Recognized (File: E71611) **Applicable Standards** UL 248-13, IEC 60269-7 **Environmental** RoHS Compliant, REACH **Operating Temperature** -55 °C to +125 °C **Storage Temperature** Up to +35 °C with relative humidity <65 % **Country of Origin** Mexico ## **Ordering Part Number** ## **PSX 3XL UB 1400 X** **Series Case Size Packing Quantity** 1XL, 3XL X = (1 pc/box) **Termination Amperage** UB = bolted blade DB = DIN blade FL = flush-metric ## **Catalog Number** **==> picture [244 x 41] intentionally omitted <==** **----- Start of picture text -----**<br> |||||||| |---|---|---|---|---|---|---| |SERIES|[CASE ]|SIZE|[TERMINATION]|[AMPERAGE]|CATALOG NUMBER|PART NUMBERORDERING| |PSX|3XL|UB|1400|PSX3XLUB1400|PSX3XLUB1400X| |Prot|Tt| **----- End of picture text -----**<br> ## **Recommended Accessories** **Microswitch:** MSXL2000C ## **Applications** Battery energy storage systems (BESSs) Power conversion systems Dc common bus systems Hybrid PV-BESS inverters Regenerative drives Industrial heaters and welding equipment Metal processing equipment ## **Web Resources** Download technical documents: **Littelfuse.com/PSX** Littelfuse.com/PSX © 2022 Littelfuse, Inc. Rev: 041122 **1 of 10** **POWR-** _**SPEED**_ **[®] Fuse** PSX SERIES HIGH-SPEED SQUARE BODY ## **Electrical Characteristics** **==> picture [506 x 299] intentionally omitted <==** **----- Start of picture text -----**<br> VOLTAGE TOTAL CLEARING<br>INTERRUPTING MINIMUM WATTS LOSS AGENCY<br>CATALOG NUMBER AMPERE RATING MELTING I [2] T (A [2] S) AT<br>CASE RATING BREAKING AT 100% CERTIFICATION<br>RATING (V) (PRE-ARC) RATED VOLTAGE<br>SIZE CAPACITY RATED<br>FLUSH BOLTED DIN (A) DC DC (A) I [2] T (A [2] S) DC CURRENT (W) cURus<br>METRIC (FL) BLADE (UB) BLADE (DB)<br>PSX1XLFL0080 PSX1XLUB0080 PSX1XLDB0080 80 1500 250 kA 800 A 2048 8720 16.4 •<br>PSX1XLFL0100 PSX1XLUB0100 PSX1XLDB0100 100 1500 250 kA 1000 A 3540 15485 19.1 •<br>PSX1XLFL0125 PSX1XLUB0125 PSX1XLDB0125 125 1500 250 kA 1250 A 7091 35720 19.6 •<br>PSX1XLFL0160 PSX1XLUB0160 PSX1XLDB0160 160 1500 250 kA 1600 A 13704 55490 24.6 •<br>PSX1XLFL0200 PSX1XLUB0200 PSX1XLDB0200 200 1500 250 kA 2000 A 18016 77240 34.6 •<br>PSX1XLFL0250 PSX1XLUB0250 PSX1XLDB0250 250 1500 250 kA 2500 A 36552 156450 38.5 •<br>PSX1XLFL0280 PSX1XLUB0280 PSX1XLDB0280 280 1500 250 kA 2800 A 36552 156450 48.7 •<br>NH 1XL<br>PSX1XLFL0315 PSX1XLUB0315 PSX1XLDB0315 315 1500 250 kA 3150 A 56940 212400 53.6 •<br>PSX1XLFL0350 PSX1XLUB0350 PSX1XLDB0350 350 1500 250 kA 3500 A 86623 332050 51.8 •<br>PSX1XLFL0400 PSX1XLUB0400 PSX1XLDB0400 400 1500 250 kA 4000 A 116271 352600 64.4 •<br>PSX1XLFL0450 PSX1XLUB0450 PSX1XLDB0450 450 1500 250 kA 6750 A 149336 540850 69.3 •<br>PSX1XLFL0500 PSX1XLUB0500 PSX1XLDB0500 500 1500 250 kA 7500 A 250109 774600 71.5 •<br>PSX1XLFL0550 PSX1XLUB0550 PSX1XLDB0550 550 1500 250 kA 8250 A 276650 924967 83.1 •<br>PSX1XLFL0630 PSX1XLUB0630 PSX1XLDB0630 630 1500 250 kA 9450 A 276650 924967 127.3 •<br>PSX3XLFL0450 PSX3XLUB0450 PSX3XLDB0450 450 1500 250 kA 4500 A 57143 194500 146.3 •<br>PSX3XLFL0500 PSX3XLUB0500 PSX3XLDB0500 500 1500 250 kA 5000 A 98570 333900 132.5 •<br>PSX3XLFL0550 PSX3XLUB0550 PSX3XLDB0550 550 1500 250 kA 5500 A 142790 451600 136.7 •<br>PSX3XLFL0630 PSX3XLUB0630 PSX3XLDB0630 630 1500 250 kA 6300 A 205617 650304 150.9 •<br>PSX3XLFL0700 PSX3XLUB0700 PSX3XLDB0700 700 1500 250 kA 7000 A 305720 1003650 164.5 •<br>NH 3XL PSX3XLFL0800 PSX3XLUB0800 PSX3XLDB0800 800 1500 250 kA 8000 A 335493 1150000 209.6 •<br>PSX3XLFL0900 PSX3XLUB0900 PSX3XLDB0900 900 1500 250 kA 9000 A 403262 1308500 266.9 •<br>PSX3XLFL1000 PSX3XLUB1000 PSX3XLDB1000 1000 1500 250 kA 10000 A 484792 1791500 335.0 •<br>PSX3XLFL1100 PSX3XLUB1100 PSX3XLDB1100 1100 1500 250 kA 11000 A 656719 2201250 341.0 •<br>PSX3XLFL1250 PSX3XLUB1250 PSX3XLDB1250 1250 1500 250 kA 12500 A 995376 3003500 346.9 •<br>PSX3XLFL1400 PSX3XLUB1400 PSX3XLDB1400 1400 1500 250 kA 14000 A 1395828 4228250 361.9 •<br>**----- End of picture text -----**<br> ## **Ordering Information** **==> picture [506 x 283] intentionally omitted <==** **----- Start of picture text -----**<br> FLUSH METRIC (FL) BOLTED BLADE (UB) DIN BLADE (DB)<br>CASE BOX<br>CATALOG ORDERING PART CATALOG ORDERING PART CATALOG ORDERING PART<br>SIZE UPC UPC UPC QUANTITY<br>NUMBER NUMBER NUMBER NUMBER NUMBER NUMBER<br>PSX1XLFL0080 PSX1XLFL0080X 07945825798 PSX1XLUB0080 PSX1XLUB0080X 07945825819 PSX1XLDB0080 PSX1XLDB0080X 07945826320 1 pc/box<br>PSX1XLFL0100 PSX1XLFL0100X 07945825799 PSX1XLUB0100 PSX1XLUB0100X 07945825820 PSX1XLDB0100 PSX1XLDB0100X 07945826321 1 pc/box<br>PSX1XLFL0125 PSX1XLFL0125X 07945825800 PSX1XLUB0125 PSX1XLUB0125X 07945825821 PSX1XLDB0125 PSX1XLDB0125X 07945826322 1 pc/box<br>PSX1XLFL0160 PSX1XLFL0160X 07945825801 PSX1XLUB0160 PSX1XLUB0160X 07945825822 PSX1XLDB0160 PSX1XLDB0160X 07945826323 1 pc/box<br>PSX1XLFL0200 PSX1XLFL0200X 07945825802 PSX1XLUB0200 PSX1XLUB0200X 07945825823 PSX1XLDB0200 PSX1XLDB0200X 07945826324 1 pc/box<br>PSX1XLFL0250 PSX1XLFL0250X 07945825803 PSX1XLUB0250 PSX1XLUB0250X 07945825824 PSX1XLDB0250 PSX1XLDB0250X 07945826325 1 pc/box<br>PSX1XLFL0280 PSX1XLFL0280X 07945825804 PSX1XLUB0280 PSX1XLUB0280X 07945825825 PSX1XLDB0280 PSX1XLDB0280X 07945826326 1 pc/box<br>NH 1XL<br>PSX1XLFL0315 PSX1XLFL0315X 07945825805 PSX1XLUB0315 PSX1XLUB0315X 07945825826 PSX1XLDB0315 PSX1XLDB0315X 07945826327 1 pc/box<br>PSX1XLFL0350 PSX1XLFL0350X 07945825806 PSX1XLUB0350 PSX1XLUB0350X 07945825827 PSX1XLDB0350 PSX1XLDB0350X 07945826328 1 pc/box<br>PSX1XLFL0400 PSX1XLFL0400X 07945825807 PSX1XLUB0400 PSX1XLUB0400X 07945825828 PSX1XLDB0400 PSX1XLDB0400X 07945826329 1 pc/box<br>PSX1XLFL0450 PSX1XLFL0450X 07945825808 PSX1XLUB0450 PSX1XLUB0450X 07945825829 PSX1XLDB0450 PSX1XLDB0450X 07945826330 1 pc/box<br>PSX1XLFL0500 PSX1XLFL0500X 07945825809 PSX1XLUB0500 PSX1XLUB0500X 07945826310 PSX1XLDB0500 PSX1XLDB0500X 07945826331 1 pc/box<br>PSX1XLFL0550 PSX1XLFL0550X 07945825810 PSX1XLUB0550 PSX1XLUB0550X 07945826311 PSX1XLDB0550 PSX1XLDB0550X 07945826332 1 pc/box<br>PSX1XLFL0630 PSX1XLFL0630X 07945825811 PSX1XLUB0630 PSX1XLUB0630X 07945826312 PSX1XLDB0630 PSX1XLDB0630X 07945826333 1 pc/box<br>PSX3XLFL0450 PSX3XLFL0450X 07945828641 PSX3XLUB0450 PSX3XLUB0450X 07945828645 PSX3XLDB0450 PSX3XLDB0450X 07945828649 1 pc/box<br>PSX3XLFL0500 PSX3XLFL0500X 07945828642 PSX3XLUB0500 PSX3XLUB0500X 07945828646 PSX3XLDB0500 PSX3XLDB0500X 07945828650 1 pc/box<br>PSX3XLFL0550 PSX3XLFL0550X 07945828643 PSX3XLUB0550 PSX3XLUB0550X 07945828647 PSX3XLDB0550 PSX3XLDB0550X 07945828651 1 pc/box<br>PSX3XLFL0630 PSX3XLFL0630X 07945828644 PSX3XLUB0630 PSX3XLUB0630X 07945828648 PSX3XLDB0630 PSX3XLDB0630X 07945828652 1 pc/box<br>PSX3XLFL0700 PSX3XLFL0700X 07945825812 PSX3XLUB0700 PSX3XLUB0700X 07945826313 PSX3XLDB0700 PSX3XLDB0700X 07945826334 1 pc/box<br>NH 3XL PSX3XLFL0800 PSX3XLFL0800X 07945825813 PSX3XLUB0800 PSX3XLUB0800X 07945826314 PSX3XLDB0800 PSX3XLDB0800X 07945826335 1 pc/box<br>PSX3XLFL0900 PSX3XLFL0900X 07945825814 PSX3XLUB0900 PSX3XLUB0900X 07945826315 PSX3XLDB0900 PSX3XLDB0900X 07945826336 1 pc/box<br>PSX3XLFL1000 PSX3XLFL1000X 07945825815 PSX3XLUB1000 PSX3XLUB1000X 07945826316 PSX3XLDB1000 PSX3XLDB1000X 07945826337 1 pc/box<br>PSX3XLFL1100 PSX3XLFL1100X 07945825816 PSX3XLUB1100 PSX3XLUB1100X 07945826317 PSX3XLDB1100 PSX3XLDB1100X 07945826338 1 pc/box<br>PSX3XLFL1250 PSX3XLFL1250X 07945825817 PSX3XLUB1250 PSX3XLUB1250X 07945826318 PSX3XLDB1250 PSX3XLDB1250X 07945826339 1 pc/box<br>PSX3XLFL1400 PSX3XLFL1400X 07945825818 PSX3XLUB1400 PSX3XLUB1400X 07945826319 PSX3XLDB1400 PSX3XLDB1400X 07945826340 1 pc/box<br>**----- End of picture text -----**<br> Littelfuse.com/PSX © 2022 Littelfuse, Inc. Rev: 041122 **2 of 10** **POWR-** _**SPEED**_ **[®] Fuse** PSX SERIES HIGH-SPEED SQUARE BODY **==> picture [262 x 57] intentionally omitted <==** ## **Dimensions** **==> picture [500 x 321] intentionally omitted <==** **----- Start of picture text -----**<br> B B B<br>E H E<br>H<br>C E C<br>C<br>D<br>D<br>D<br>J F A I F<br>A F A I<br>G<br>G<br>G<br>Figure 1. Flush-metric style Figure 2. Bolted-blade style Figure 3. DIN-blade style<br>**----- End of picture text -----**<br> **==> picture [506 x 167] intentionally omitted <==** **----- Start of picture text -----**<br> DIMENSIONS MM (IN)<br>CASE MOUNTING RECOMMENDED RECOMMENDED<br>FIGURE A B C D E F G* H I J THREAD<br>SIZE STYLE FASTENER TORQUE<br>FLUSH 1 128.5 51.5 51.5 57.5 20.0 126.7 83.9 - - - - M8 x 1.25 13–20 Nm<br>METRIC (FL) (5.06) (2.03) (2.03) (2.26) (0.79) (4.99) (3.30)<br>NH BOLTED 2 211.5 51.5 51.5 57.5 25.0 126.7 83.9 6.0 146.5 187.5 12 mm - 64 Nm<br>1XL BLADE (UB) (8.33) (2.03) (2.03) (2.26) (0.98) (4.99) (3.30) (0.24) (5.77) (7.38) (1/2)<br>DIN BLADE 3 199.5 51.5 51.5 57.5 25.0 126.7 83.9 6.0 167.5 - 10 mm - 26 Nm<br>(DB) (7.85) (2.03) (2.03) (2.26) (0.98) (4.99) (3.30) (0.24) (6.59) (3/8)<br>FLUSH 1 129.5 73.5 73.5 79.5 30.0 128.1 105.9 - - - - M12 x 1.75 45–55 Nm<br>METRIC (FL) (5.10) (2.89) (2.89) (3.13) (1.18) (5.04) (4.17)<br>NH BOLTED 2 213.5 73.5 73.5 79.5 36.0 128.7 105.9 6.0 153.1 186.1 14 mm - 92 Nm<br>3XL BLADE (UB) (8.41) (2.89) (2.89) (3.13) (1.42) (5.07) (4.17) (0.24) (6.03) (7.33) (9/16)<br>DIN BLADE 3 199.0 73.5 73.5 79.5 36.0 128.7 105.9 6.0 166.8 - 10 mm - 26 Nm<br>(DB) (7.83) (2.89) (2.89) (3.13) (1.42) (5.07) (4.17) (0.24) (6.57) (3/8)<br>**----- End of picture text -----**<br> *These dimensions include the optional bolt-on microswitch. Littelfuse.com/PSX © 2022 Littelfuse, Inc. Rev: 041122 **3 of 10** **POWR-** _**SPEED**_ **[®] Fuse** PSX SERIES HIGH-SPEED SQUARE BODY **==> picture [262 x 57] intentionally omitted <==** ## **Time Current Curve (1XL Case Size 80 A–400 A)** **==> picture [458 x 527] intentionally omitted <==** **----- Start of picture text -----**<br> 100 100<br>90 90<br>80 80<br>70 70<br>60 60<br>50 50<br>40 40<br>30 30<br>20 20<br>1098 1098<br>7 7<br>6 6<br>5 5<br>4 - 80A 4<br>3 3<br>- 100A<br>2 - 125A 2<br>- 160A<br>1<br>0.90.8 - 200A 10.90.8<br>0.7 0.7<br>0.6 - 250A 0.6<br>0.5 0.5<br>0.4 - 315A 0.4<br>0.3 0.3<br>- 350A<br>0.2 - 400A 0.2<br>0.1 0.1<br>0.09 0.09<br>0.08 0.08<br>0.07 0.07<br>0.06 0.06<br>0.05 0.05<br>0.04 0.04<br>0.03 0.03<br>0.02 0.02<br>0.01 0.01<br>0.009 0.009<br>0.008 0.008<br>0.007 0.007<br>0.006 0.006<br>0.005 0.005<br>0.004 0.004<br>0.003 0.003<br>0.002 0.002<br>0.001 0.001<br>0.0009 0.0009<br>0.0008 0.0008<br>0.0007 0.0007<br>0.0006 0.0006<br>0.0005 0.0005<br>0.0004 0.0004<br>0.0003 0.0003<br>0.0002 0.0002<br>0.0001 0.0001<br>PROSPECTIVE R.M.S CURRENT IN AMPERE<br>100 200 300 400 500 600 700 800 900 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 20000 30000 40000 50000 60000 70000 80000 90000 100000<br>VIRTUAL MELTING (PRE‐ARCING) TIME IN SECONDS<br>100 200 300 400 500 600 700 800 900 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 20000 30000 40000 50000 60000 70000 80000 90000 100000<br>**----- End of picture text -----**<br> Littelfuse.com/PSX © 2022 Littelfuse, Inc. Rev: 041122 **4 of 10** **POWR-** _**SPEED**_ **[®] Fuse** PSX SERIES HIGH-SPEED SQUARE BODY **==> picture [262 x 57] intentionally omitted <==** ## **Time Current Curve (1XL Case Size 450 A–630 A)** **==> picture [458 x 527] intentionally omitted <==** **----- Start of picture text -----**<br> 100 100<br>90 90<br>80 80<br>70 70<br>60 60<br>50 50<br>40 40<br>30 30<br>20 20<br>1098 1098<br>7 7<br>6 6<br>5 5<br>4 4<br>3 3<br>2 2<br>1<br>0.9 10.9<br>0.8 0.8<br>0.7 0.7<br>0.6 0.6<br>0.5 - 450A 0.5<br>0.4 0.4<br>0.3 - 500A 0.3<br>0.2 0.2<br>- 630A<br>0.1 0.1<br>0.09 0.09<br>0.08 0.08<br>0.07 0.07<br>0.06 0.06<br>0.05 0.05<br>0.04 0.04<br>0.03 0.03<br>0.02 0.02<br>0.01 0.01<br>0.009 0.009<br>0.008 0.008<br>0.007 0.007<br>0.006 0.006<br>0.005 0.005<br>0.004 0.004<br>0.003 0.003<br>0.002 0.002<br>0.001 0.001<br>0.0009 0.0009<br>0.0008 0.0008<br>0.0007 0.0007<br>0.0006 0.0006<br>0.0005 0.0005<br>0.0004 0.0004<br>0.0003 0.0003<br>0.0002 0.0002<br>0.0001 0.0001<br>PROSPECTIVE R.M.S CURRENT IN AMPERE<br>100 200 300 400 500 600 700 800 900 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 20000 30000 40000 50000 60000 70000 80000 90000 100000<br>VIRTUAL MELTING (PRE‐ARCING) TIME IN SECONDS<br>100 200 300 400 500 600 700 800 900 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 20000 30000 40000 50000 60000 70000 80000 90000 100000<br>**----- End of picture text -----**<br> Littelfuse.com/PSX © 2022 Littelfuse, Inc. Rev: 041122 **5 of 10** **POWR-** _**SPEED**_ **[®] Fuse** PSX SERIES HIGH-SPEED SQUARE BODY **==> picture [262 x 57] intentionally omitted <==** ## **Time Current Curve (1XL Case Size 280 A and 550 A)** **==> picture [458 x 527] intentionally omitted <==** **----- Start of picture text -----**<br> 100 100<br>90 90<br>80 80<br>70 70<br>60 60<br>50 50<br>40 40<br>30 30<br>20 20<br>1098 1098<br>7 7<br>6 6<br>5 5<br>4 4<br>3 3<br>2 2<br>1<br>0.9 10.9<br>0.8 0.8<br>0.7 0.7<br>0.6 0.6<br>0.5 0.5<br>0.4 0.4<br>0.3 - 280A 0.3<br>0.2 0.2<br>- 550A<br>0.1 0.1<br>0.09 0.09<br>0.08 0.08<br>0.07 0.07<br>0.06 0.06<br>0.05 0.05<br>0.04 0.04<br>0.03 0.03<br>0.02 0.02<br>0.01 0.01<br>0.009 0.009<br>0.008 0.008<br>0.007 0.007<br>0.006 0.006<br>0.005 0.005<br>0.004 0.004<br>0.003 0.003<br>0.002 0.002<br>0.001 0.001<br>0.0009 0.0009<br>0.0008 0.0008<br>0.0007 0.0007<br>0.0006 0.0006<br>0.0005 0.0005<br>0.0004 0.0004<br>0.0003 0.0003<br>0.0002 0.0002<br>0.0001 0.0001<br>PROSPECTIVE R.M.S CURRENT IN AMPERE<br>100 200 300 400 500 600 700 800 900 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 20000 30000 40000 50000 60000 70000 80000 90000 100000<br>VIRTUAL MELTING (PRE‐ARCING) TIME IN SECONDS<br>100 200 300 400 500 600 700 800 900 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 20000 30000 40000 50000 60000 70000 80000 90000 100000<br>**----- End of picture text -----**<br> Littelfuse.com/PSX © 2022 Littelfuse, Inc. Rev: 041122 **6 of 10** **POWR-** _**SPEED**_ **[®] Fuse** PSX SERIES HIGH-SPEED SQUARE BODY **==> picture [262 x 57] intentionally omitted <==** ## **Time Current Curve (3XL Case Size 450 A–1400 A)** **==> picture [477 x 559] intentionally omitted <==** **----- Start of picture text -----**<br> 100 100<br>90 90<br>80 80<br>70 70<br>60 60<br>50 50<br>40 40<br>30 30<br>20 20<br>1098 1098<br>7 7<br>6 6<br>5 5<br>4 4<br>3 3<br>2 2<br>1<br>0.9 10.9<br>0.8 0.8<br>0.7 0.7<br>0.6 0.6<br>0.5 0.5<br>0.4 0.4<br>0.3 0.3<br>0.2 0.2<br>- 450A<br>0.1 - 500A 0.1<br>0.09 0.09<br>0.080.07 - 550A 0.080.07<br>0.06 0.06<br>0.05 - 630A 0.05<br>0.04 0.04<br>- 700A<br>0.03 0.03<br>- 800A<br>0.02 0.02<br>- 900A<br>0.01 - 1000A 0.01<br>0.009 0.009<br>0.008 0.008<br>0.007 - 1100A 0.007<br>0.006 0.006<br>0.005 - 1250A 0.005<br>0.004 0.004<br>0.003 - 1400A 0.003<br>0.002 0.002<br>0.001 0.001<br>0.0009 0.0009<br>0.0008 0.0008<br>0.0007 0.0007<br>0.0006 0.0006<br>0.0005 0.0005<br>0.0004 0.0004<br>0.0003 0.0003<br>0.0002 0.0002<br>0.0001 0.0001<br>PROSPECTIVE R.M.S CURRENT IN AMPERE<br>100 200 300 400 500 600 700 800 900 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 20000 30000 40000 50000 60000 70000 80000 90000 100000 200000 300000 400000 500000 600000 700000 800000 900000 1000000<br>VIRTUAL MELTING (PRE‐ARCING) TIME IN SECONDS<br>100 200 300 400 500 600 700 800 900 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000 20000 30000 40000 50000 60000 70000 80000 90000 100000 200000 300000 400000 500000 600000 700000 800000 900000 1000000<br>**----- End of picture text -----**<br> Littelfuse.com/PSX © 2022 Littelfuse, Inc. Rev: 041122 **7 of 10** **POWR-** _**SPEED**_ **[®] Fuse** PSX SERIES HIGH-SPEED SQUARE BODY ## **Total Clearing l[2] T Correction Factor Curve (1XL and 3XL)** **==> picture [425 x 517] intentionally omitted <==** **----- Start of picture text -----**<br> 1 1<br>0.9 ee 0.9<br>0.8 0.8<br>a<br>0.7 0.7<br>pf tp fe<br>0.6 0.6<br>pf fet tT<br>ean<br>0.5 0.5<br>0.4 TTTtt dd 0.4<br>0.3 0.3<br>0.2 0.2<br>0.1 0.1<br>OPERATING VOLTAGE IN VOLTS<br>500 600 700 800 900 1000 1100 1200 1300 1400 1500<br>t CORRECTION FACTOR<br>2<br>TOTAL CLEARING I<br>500 600 700 800 900 1000 1100 1200 1300 1400 1500<br>**----- End of picture text -----**<br> Littelfuse.com/PSX © 2022 Littelfuse, Inc. Rev: 041122 **8 of 10** **POWR-** _**SPEED**_ **[®] Fuse** PSX SERIES HIGH-SPEED SQUARE BODY ## **Peak Arc Voltage Curve 1XL and 3XL** **==> picture [451 x 508] intentionally omitted <==** **----- Start of picture text -----**<br> 2000<br>1900<br>1800 4<br>1700 BRP<br>1600<br>1500<br>1400<br>1300<br>1200<br>500 600 700 800 900 1000 1100 1200 1300 1400 1500<br>OPERATING VOLTAGE IN VOLTS<br>PEAK ARC VOLTAGE IN VOLT<br>**----- End of picture text -----**<br> Littelfuse.com/PSX © 2022 Littelfuse, Inc. Rev: 041122 **9 of 10** **POWR-** _**SPEED**_ **[®] Fuse** PSX SERIES HIGH-SPEED SQUARE BODY **==> picture [262 x 57] intentionally omitted <==** ## **Temperature Derating Curve** ## **Watts Loss Correction Factor Curve** (temperature of air immediately surrounding fuse) **==> picture [506 x 271] intentionally omitted <==** **----- Start of picture text -----**<br> 30%<br>1 1<br>0.9 0.9<br>20% 0.8 0.8<br>0.7 0.7<br>10%<br>0.6 0.6<br>0 0 0.5 0.5<br>10% 0.4 0.4<br>20%<br>0.3 0.3<br>30%<br>40% 0.2 0.2<br>50%<br>-60°C -40°C -20°C 0°C 20°C 40°C 60°C 80°C 100°C 120°C 140°C<br>-76°F -40°F -4°F 32°F 68°F 104°F 140°F 176°F 212°F 248°F 284°F<br>0.1 0.1<br>AMBIENT TEMPERATURE<br>PERCENT OF RATED CURRENT(%)<br>30 40 50 60 70 80 90 100<br>PERCENT OF UPRATING<br>WATTS LOSS CORRECTION FACTOR<br>PERCENT OF DOWNRATING<br>30 40 50 60 70 80 90 100<br>**----- End of picture text -----**<br> **Disclaimer Notice –** Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications. Read complete Disclaimer Notice at **www.littelfuse.com/product-disclaimer.** Littelfuse.com/PSX © 2022 Littelfuse, Inc. Rev: 041122 **10 of 10**
Updated at March 10, 2026
Founded in 1927 and headquartered in Chicago, Illinois, Littelfuse is a premier global manufacturer of circuit protection, power control, and sensing technologies. Widely recognized for pioneering the first small, fast-acting protective fuse, the company has grown into an industry leader whose highly reliable components are essential to modern industrial, transportation, and consumer electronics applications worldwide. At the core of the Littelfuse portfolio is an expansive and industry-leading range of circuit protection solutions. This encompasses a massive selection of traditional fuses, fuse holders, and resettable PTC thermistor fuses designed to safely interrupt overcurrent conditions. To defend against electrical overstress, Littelfuse also provides advanced transient voltage suppression (TVS) technologies, including thousands of specialized TVS diodes, TVS varistors, and gas discharge tubes (GDTs) that ensure robust defense against voltage spikes and environmental hazards. Beyond its foundational protection components, Littelfuse manufactures a diverse array of discrete semiconductors, sensors, and switching devices. Engineers rely on their high-performance thyristors, including TRIACs and SCRs, alongside power-efficient Schottky diodes and MOSFETs for demanding power control applications. Complemented by precision proximity sensors and highly reliable reed and solid-state relays, Littelfuse delivers the critical building blocks required for secure, efficient, and complete system design.
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