Littelfuse ESR1XLUB0125X - 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. Applications: Battery energy storage systems (BESSs) – Battery Protection Unit (BPU) and battery racks; Power conversion systems; Dc common bus systems; Hybrid PV-BESS inverters.
Littelfuse

ESR1XLUB0125X

Alternate Item Number: ESR1XLUB0125X

UPC: 079458306293


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Overview

The Littelfuse ESR1XLUB0125X is a 1500 V dc, 125 A high-speed square body fuse from the Energy Storage Rack (ESR) series, specifically engineered for critical protection in battery energy storage systems (BESSs), power conversion systems, DC common bus systems, and hybrid PV-BESS inverters. This Class aBat partial range fuse offers superior short-circuit protection with an extremely fast-acting response to a wide spectrum of fault currents, safeguarding battery modules and other sensitive DC equipment. Its low minimum breaking capacity (MBC), ranging from 300% (3 times) of the rated current up to 175 kA (250 kA self-certified), ensures protection against overcurrents that conventional high-speed partial range fuses may miss. The ESR fuse is designed to safely interrupt most faults within a battery storage system, preventing catastrophic failures and costly operational downtime. Key benefits include a high DC interrupting rating (175 kA UL, 250 kA self-certified) that supports system scalability without redesign, and a low MBC that simplifies coordination with battery modules while reducing the size and rating requirements for DC contactors, saving space and cost. Its extremely fast-acting performance and low watt loss maximize system efficiency by minimizing energy loss. Conforming to the IEC60269-7 battery standard, the ESR series is purpose-built to protect evolving battery technologies. The compact NH 1XL size provides design flexibility and space savings. SKU: ESR1XLUB0125X. Manufacturer: Littelfuse.
  • 1500 V dc, 125 A high-speed square body fuse for battery protection
  • Class aBat partial range fuse with superior short-circuit protection
  • Low minimum breaking capacity (MBC) from 300% to 175 kA (250 kA self-certified)
  • Extremely fast-acting response to fault currents
  • Conforms to IEC60269-7 battery standard for evolving battery technologies

Specifications

Amperage Rating
125 A
Brand Name
Littelfuse
Case Size
NH 1XL
Current Rating
125 A
Interrupting Rating
175 kA @ 1500 Vdc
Opening Type
aBat
Series
ESR
Size
NH 1XL
Sub Brand
Specialty Power Fuses
Voltage Rating
1500 V
Package Dimensions (L x W x H)
8.33 IN x 2.03 IN x 2.26 IN
Package Dimensions (L x W x H)
21.158 cm x 5.156 cm x 5.74 cm
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POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.

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POWR-JAW clamps improve the contact between fuse and clip. The unnecessary heat from poor contact due to the loss of spring force in the clips can cause nuisance fuse opening and premature aging of surrounding components. High temperature phenolic resin knob designed for the most severe environments 7 sizes to provide effective coverage. Simple design makes installation easy.

Frequently Asked Questions about Littelfuse

What certifications and standards do Littelfuse products comply with?

Littelfuse products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Customers can verify specific product certifications by consulting individual product datasheets on Littelfuse.com, which provide comprehensive details about standards compliance for each component.

What industries and applications are Littelfuse products used for?

Littelfuse products are critical for electrical protection and safety across multiple industrial sectors, including manufacturing, automation, power distribution, and electrical control systems. Their comprehensive product portfolio serves industries that require robust electrical protection, including motor and pump applications, solar installations, programmable logic controllers (PLCs), electrical switch panels, and critical infrastructure environments. Key product lines protect against overcurrent, voltage transients, ground faults, and temperature-related electrical risks, ensuring equipment safety and operational reliability.

What technical support does Littelfuse offer?

Littelfuse offers comprehensive technical support through multiple channels. Their Technical Hotline (800-TEC-FUSE) provides direct access to engineers who can help identify issues and recommend solutions. Additionally, Littelfuse offers extensive online Technical Resources at Littelfuse.com, including datasheets, product manuals, whitepapers, application guides, and online design tools. Their experienced product and application engineers also provide step-by-step support from design to installation.

What are the main product lines offered by Littelfuse?

Littelfuse offers comprehensive industrial protection and control product lines, including fuses, fuse holders, protection relays, temperature sensors, and electrical safety components. Their key product categories span surge protective devices, custom OEM products, electrical switch panels, medium voltage fuses, ground-fault protection relays, motor and pump protection devices, and temperature sensors. These products are designed to minimize electrical safety hazards, limit equipment damage, improve productivity, and safeguard personnel from electrical faults.

What are the key features of Littelfuse products?

Littelfuse products feature exceptional circuit protection technologies with key characteristics including UL/IEC safety standard compliance, low internal resistance, and advanced protective capabilities across multiple product lines. Their components provide critical protection for industrial systems, offering features like overcurrent protection, voltage transient suppression, and resettable protection devices with ultra-low resistance and compact designs. Key product lines include fuses, metal oxide varistors (MOVs), TVS diodes, PolySwitch devices, and specialized electronic protection components that enhance system reliability and safety.

What environmental ratings do Littelfuse products have?

Littelfuse products feature comprehensive environmental ratings, including NEMA Type 1, 2, 3, 3R, 4/4X, 12, and 13 certifications, as well as IP65 protection. These ratings ensure superior protection in diverse industrial environments, with an operating temperature range of -40°F to +131°F (-40°C to +55°C). Many products also include UV-stabilized materials and neoprene gaskets for enhanced durability in outdoor and challenging conditions.

What accessories are available for Littelfuse products?

Littelfuse offers several key accessories across their product lines, including fuse holders, voltage monitoring modules, and terminal connectors. Specific accessories include the LPSM003ZXID (indicating) and LPSM003Z (non-indicating) POWR-SAFE Dead Front fuse holders for Class CC and Midget-Style fuses, the VRM6048 voltage monitor accessory module, and female quick connect terminals (P1015 series) in various wire gauge sizes. These accessories are designed to enhance protection, monitoring, and connectivity for Littelfuse electrical components.

What is Littelfuse's warranty policy?

Littelfuse provides comprehensive warranty details on their official website at www.littelfuse.com/warranty. Customers should visit this page to review the specific warranty terms and conditions for their specific product lines. For direct warranty support or questions, customers can contact Littelfuse Technical Support at 1-800-TEC-FUSE or email [email protected].

What communication protocols do Littelfuse products support?

Littelfuse supports a comprehensive range of industrial communication protocols, including PROFIBUS, PROFINET, EtherNet/IP, DeviceNet, Modbus RTU, and CANopen. Our products provide flexible connectivity solutions across multiple industrial automation platforms, enabling seamless integration with various control systems and network architectures.

How are Littelfuse products typically installed?

Littelfuse products are typically installed using specialized mounting hardware like fuse holders, blocks, and panels designed for specific industrial applications. The POWR-SAFE Dead Front holders, for example, provide optimum protection for Class CC and Midget-Style fuses, supporting installations up to 600 VAC/DC. Installation often involves using precision terminals with strain relief, such as 0.25 in. female quick connect terminals, to ensure secure and safe electrical connections in industrial control systems.