Littelfuse SPD2-550-4P0 - Surge protection devices (SPDs) provide equipment protection from transient overvoltage events lasting micro-seconds. By limiting the overvoltage to the equipment during these events, costly damage and downtime can be mitigated. The surge protection devices for the 1+0 configuration are available for 60 V to 600 V nominal voltage sub-distribution board applications.
Littelfuse

SPD2-550-4P0

Alternate Item Number: SPD2-550-4P0

UPC: 079458257861

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Overview

The **Littelfuse SPD2-550-4P0** surge protection device (SPD) is a high-performance solution engineered to safeguard critical electrical equipment from destructive transient overvoltage events. Designed for **1+0 configuration applications** in sub-distribution boards, this SPD operates within a **60V to 600V nominal voltage range**, making it ideal for protecting sensitive industrial and commercial systems from damaging power surges and voltage spikes. Manufactured by **Littelfuse**, a global leader in circuit protection technologies, the SPD2-550-4P0 delivers reliable performance in environments where equipment longevity and operational continuity are paramount. Transient overvoltage events—often lasting mere microseconds—can cause catastrophic damage to electrical components, leading to costly repairs, unplanned downtime, and compromised safety. The **SPD2-550-4P0** mitigates these risks by **limiting overvoltage to safe levels**, ensuring that connected equipment remains protected even during severe transient conditions. Its robust design and high-performance capabilities make it a trusted choice for professionals in industries such as **manufacturing, data centers, healthcare, renewable energy, and infrastructure**, where electrical reliability is non-negotiable. **Key Applications and Industry Use Cases:** The SPD2-550-4P0 is specifically tailored for **sub-distribution board applications**, where it provides critical protection for downstream equipment. Typical use cases include: - **Industrial automation systems**, where PLCs, motor drives, and control panels are vulnerable to voltage spikes from switching events or external disturbances. - **Commercial buildings**, including offices, retail spaces, and hospitality facilities, where sensitive electronics like HVAC systems, lighting controls, and IT infrastructure require surge protection. - **Renewable energy installations**, such as solar and wind power systems, where inverters and power conditioning equipment are exposed to frequent transient events. - **Healthcare facilities**, where uninterrupted power supply and equipment protection are essential for patient safety and regulatory compliance. - **Telecommunications and data centers**, where downtime is unacceptable, and equipment must withstand frequent power fluctuations. **Why Choose Littelfuse for Surge Protection?** Littelfuse is a **pioneer in circuit protection**, with decades of expertise in developing solutions that enhance the reliability and safety of electrical systems. The **SPD2-550-4P0** exemplifies this commitment, offering: - **Proven durability** in harsh industrial environments, with a design optimized for long-term performance. - **Fast response times** to transient events, ensuring minimal exposure to damaging overvoltages. - **Compatibility with 1+0 configuration systems**, providing flexibility for a wide range of sub-distribution applications. - **Compliance with industry standards**, including UL, IEC, and other regulatory requirements, ensuring peace of mind for engineers and facility managers. **Installation and Selection Considerations:** When selecting an SPD for sub-distribution boards, professionals must consider several factors to ensure optimal protection. The **SPD2-550-4P0** is engineered to meet the demands of **60V to 600V systems**, making it suitable for both low- and medium-voltage applications. Its **compact design** allows for easy integration into existing panels, while its **high surge current handling capacity** ensures reliable performance even in high-energy transient scenarios. For best results, the SPD should be installed **as close as possible to the protected equipment** to minimize the length of exposed wiring, which can act as an antenna for transient currents. Additionally, professionals should ensure that the SPD is **properly sized** for the system’s nominal voltage and expected surge conditions. Littelfuse provides comprehensive technical support and documentation to assist with selection, installation, and maintenance, reinforcing its reputation as a trusted partner in electrical protection. **Conclusion:** The **Littelfuse SPD2-550-4P0** is more than just a surge protection device—it’s a critical investment in the reliability and longevity of your electrical infrastructure. By safeguarding equipment from transient overvoltage events, it helps prevent costly damage, reduce downtime, and ensure continuous operation in even the most demanding environments. Whether you’re protecting industrial machinery, commercial systems, or renewable energy installations, the SPD2-550-4P0 delivers the performance and peace of mind you need. Trust Littelfuse, a global leader in circuit protection, to provide the solutions that keep your systems running smoothly.
  • 60V to 600V nominal voltage range for versatile sub-distribution applications
  • 1+0 configuration design for optimal surge protection in industrial/commercial systems
  • Fast response to transient overvoltage events to prevent equipment damage
  • Compact and robust design for easy installation in sub-distribution boards
  • Trusted Littelfuse quality with compliance to industry standards (UL, IEC)

Specifications

Application
Equipment protection from transient overvoltages
Brand Name
Littelfuse
Special Features
DIN Rail Mount
Standard
UL Listed
Sub Brand
SPD2 Series
Type
Type 2 Surge Protection Devices
Ethernet SHDSL Extender

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Fiber cable ODC to SC duplex - 670mm

Fiber cable ODC SC Duplex 670mm

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Power supply for DIN-rail

PS-60

Power supply for DIN-rail
DIN Rail ? DIN 35

ARH 1656

DIN Rail ? DIN 35
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6U PERF PANEL

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6U PERF PANEL
This TX6A 10Gig Cat 6A STP Patch Cord is a 12-Meter, Int'l Grey cord constructed of 26 AWG, shielded, twisted pair, stranded, CM/LSZH cable and with high-performance modular plugs. Its tangle-free latch prevents snags and ensures a fast release, streamlining moves, adds, and changes. The slender strain relief boot provides easy access in high-density applications. Enabled with RapidID, the product has pre-installed barcodes for simple port mapping using RapidID software.

STP6X12MIG

This TX6A 10Gig Cat 6A STP Patch Cord is a 12-Meter, Int'l Grey cord constructed of 26 AWG, shielded, twisted pair, stranded, CM/LSZH cable and with high-performance modular plugs. Its tangle-free latch prevents snags and ensures a fast release, streamlining moves, adds, and changes. The slender strain relief boot provides easy access in high-density applications. Enabled with RapidID, the product has pre-installed barcodes for simple port mapping using RapidID software.
OM1 2 fiber, 16mm jacket, patchcord, Riser (OFNR) rated, LC duplex to SC duplex, Std IL

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CESUM3-C15

Membrane plate cable entry system offers a good strain relief while maintaining IP/NEMA ingress sealing rating. The CESUM3-C15 is a Rectangular Un-Terminated Cable Entry System, 4.1" (103 mm) Long, with 8 Openings 0.12" (3.0 mm) to 0.31" (8 mm), 3 Openings 0.20" (5.1 mm) to 0.35" (9.0 mm), 4 Openings 0.3" (7.5 mm) to 0.47" (12.0 mm). Color is Black. Standard Package Quantity is 1 PC.

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.