ESR Series - Battery Protection Fuses

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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.

The Littelfuse Energy Storage Rack (ESR) series of fuses is designed specifically to protect battery racks in energy storage systems, inverters, and many other dc applications. The 1500 V dc high-speed square body fuse is extremely fast-acting to respond quickly to a range of fault currents to safeguard the battery module or other devices.

This Class aBat partial range fuse has superior short circuit protection and a low minimum breaking capacity (MBC)—from 300 % or 3 times the fuse’s rated current to 175 kA (250 kA self-certified)—to cover a range of over currents that traditional high-speed partial range fuses do not protect against.

The ESR fuse safely interrupts most faults in a battery storage system to avoid catastrophic failures and costly shutdowns.

Features and Benefits:
  • High dc interrupting rating provides superior short-circuit protection and the ability to scale-up systems without the need to redesign the existing circuit protection, saving time and costs
  • The low minimum breaking current offers easy coordination with battery modules and reduces size and rating of dc contactors to save space and costs
  • Extremely fast acting delivers high-speed performance
  • Low watt loss maximizes efficiency by preventing energy loss and minimizing the wasted power of components
  • Conforming to the IEC60269-7 battery standard, the ESR series is specifically designed to safeguard evolving battery technologies with fuse circuit protection
  • Compact NH 1XL size saves space and offers design flexibility
  • Battery energy storage systems (BESSs) – Battery Protection Unit (BPU) and battery racks
  • Power conversion systems
  • Dc common bus systems
  • Hybrid PV-BESS inverters

Access specifications, certifications, check availability and order parts below

Catalog #Amps (A)Interrupting RatingOpeningVDC (V)Case SizeAmp Code (part number)SamplesCompare
ESR1XLDB0125125175 kA @ 1500 VdcaBat1500NH 1XL0125Order
ESR1XLUB0125125175 kA @ 1500 VdcaBat1500NH 1XL0125Order
Part # Part Description RoHS Pb-free RoHS (2015/ 863/EU) Certificate REACH (SVHC’s) Declaration Halogen Free REACH (SVHC’s) IPC-Material Declaration
ESR1XLDB0125X RoHS No 05/04/2022 PbFree No 05/04/2022 CoC_RoHS10_ESR1XL_SERIES_125A REACH_SVHC_Declaration_ESR1XL_SERIES_125A Yes
Does not Contain IPC_ESR1XLDB0125X
ESR1XLUB0125X RoHS No 05/04/2022 PbFree No 05/04/2022 CoC_RoHS10_ESR1XL_SERIES_125A REACH_SVHC_Declaration_ESR1XL_SERIES_125A Yes
Does not Contain IPC_ESR1XLUB0125X
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ESR1XLDB0125 URiconCURicon
ESR1XLUB0125 URiconCURicon