PSX3XLFL1000 - PSX Series – High-Speed Semiconductor Fuse, Square Body Series

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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" includes Littelfuse, Inc., and all of its affiliate entities.

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 of 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 style, DIN-style and bolted-blade style. Visual blown fuse indication is standard on all fuses and optional micro-switch is available for external indication. The PSX series is certified to UL 248-13 and compliant with the IEC 60269-7 (Class aBat) battery protection fuse standard.



  • 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



  • Battery energy storage systems (BESS)
  • Power conversion systems
  • Dc common bus systems
  • Hybrid PV-BESS inverters
  • Regenerative drives
  • Industrial heaters and welding equipment
  • Metal processing industries
Property (Mouseover for details) Value
Ampere Rating (A) 1000
Amp Code (Part Number) 1000
Interrupting Rating 250 kA @ 1500 Vdc
Opening aBat
Case Size NH 3XL
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
PSX3XLFL1000X POWR-SPEED SQB SIZE 3XL FLUSH 1000A RoHS No 09/07/2020 PbFree No 09/07/2020 CoC_RoHS10_PSX3XLFL1000X Yes
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