Littelfuse ESR3XLUB0550X - POWR-SPEED SQB ESR 1500VDC 3XL BOLT 550A
Littelfuse

ESR3XLUB0550X

Alternate Item Number: ESR3XLUB0550X

UPC: 079458377798


Documents & Media
Specification Sheet

Contact for Pricing

Minimum Qty: 7

Multiplier: 7

*Contact for lower quantities*

Overview

The Littelfuse POWR-SPEED SQB ESR 3XL BOLT 1500VDC 550A surge protective device (SPD) is engineered to deliver superior protection for critical electrical infrastructure in demanding high-voltage DC applications. Designed for reliability and robust performance, this SPD is an essential component for safeguarding sensitive equipment from the damaging effects of transient overvoltages and lightning-induced surges. Its advanced ESR (Enhanced Surge Response) technology ensures rapid and effective clamping of surge events, minimizing downtime and costly repairs. With an impressive 1500 VDC rating and a substantial 550A current handling capability, the POWR-SPEED SQB ESR is ideally suited for use in sectors where high energy levels are prevalent. This includes, but is not limited to, large-scale solar photovoltaic (PV) installations, wind turbine power systems, industrial DC power distribution networks, and electric vehicle (EV) charging infrastructure. The integrity of these systems relies heavily on effective surge protection to maintain operational continuity and prevent premature component failure. Littelfuse, a globally recognized leader in circuit protection, brings its extensive expertise to the POWR-SPEED SQB series. This commitment to quality and innovation is evident in the durable construction and advanced features of this SPD. The 3XL BOLT termination style ensures a secure and reliable electrical connection, crucial for maintaining system integrity under high fault current conditions. Installation is designed to be straightforward, integrating seamlessly into existing or new high-voltage DC systems, thereby reducing commissioning time and labor costs. Key benefits of deploying the Littelfuse POWR-SPEED SQB ESR 1500VDC 550A include: * **Exceptional Surge Suppression:** Advanced ESR technology provides rapid response to transient overvoltages, protecting sensitive electronics. * **High Voltage and Current Capability:** Rated for 1500 VDC and 550A, suitable for the most demanding industrial and renewable energy applications. * **Enhanced Reliability:** Built with high-quality components to ensure long-term performance and durability in harsh environments. * **Secure Connectivity:** Features 3XL BOLT terminals for robust and dependable electrical connections. * **Reduced Downtime:** Minimizes the risk of equipment damage, leading to increased operational uptime and reduced maintenance expenses. Choosing the right surge protection is paramount for ensuring the longevity and efficiency of high-voltage DC systems. The Littelfuse POWR-SPEED SQB ESR 1500VDC 550A offers a comprehensive solution, combining cutting-edge technology with proven reliability, making it a trusted choice for engineers and system designers worldwide. Its application extends to protecting inverters, DC combiners, battery energy storage systems (BESS), and other vital components within these high-power DC environments. Invest in the protection that keeps your operations running smoothly and securely with Littelfuse.
  • 1500 VDC voltage rating for high-power DC applications
  • 550A current handling capacity for robust surge suppression
  • Enhanced Surge Response (ESR) technology for rapid transient clamping
  • 3XL BOLT termination for secure and reliable electrical connections
  • Designed for demanding industrial, solar, and EV charging environments

Specifications

Connection Type
Bolt
Current Rating
550 A
Material
Enhanced Surge Response (ESR) technology
Mounting Type
Bolt-On
Poles
3XL
Series
POWR-SPEED SQB ESR
Voltage Rating
1500 VDC
Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount

GPM-SRR90

Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount
Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20

C331156

Fuse Holder UltraSafe™ 800VAC 1000VDC UL Fuse size 14x51 1-Pole Visual Indicator Microswitch Pressure Plate IP20
Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8

1SCM8

Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8
Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

E1062696

Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20
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.

LCC5

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.
9F61 Size B Clips 1.6in

9F61BWW460

9F61 Size B Clips 1.6in

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.