Littelfuse NLS500 - NLS series fuses provide low cost protection for general-purpose feeder and branch circuits when available short circuit currents are less than 50,000 amperes. They replace all Class H fuses which have only a 10,000 ampere interrupting rating. They are suitable for use in many residential and smaller commercial and industrial applications.
Littelfuse

NLS500

Alternate Item Number: 0NLS500.X

UPC: 079458370966

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Overview

The Littelfuse NLS500 (SKU: NLS500) offers a cost-effective and reliable solution for general-purpose feeder and branch circuit protection, specifically designed for applications where available short circuit currents do not exceed 50,000 amperes. This fuse serves as a direct and superior replacement for outdated Class H fuses, which are limited to a 10,000 ampere interrupting rating. The NLS500 provides a significant upgrade, offering five times the fault protection capacity of Class H fuses, thereby enhancing the safety and dependability of electrical systems. Its robust construction ensures long-term durability and consistent performance, even under fault conditions. The NLS500 is well-suited for a variety of residential, smaller commercial, and industrial environments where dependable overcurrent protection is a necessity. Its high interrupting rating makes it an ideal choice for modern electrical installations requiring enhanced circuit safeguarding without the expense of extensive system upgrades. By providing a critical increase in protection levels, the NLS500 helps mitigate the risk of equipment damage and electrical fires. It is a versatile and trustworthy option for maintaining electrical integrity in both everyday and critical applications. The NLS500 is compatible with standard fuse holders and panels, allowing for seamless integration into existing systems for both new installations and retrofits, while delivering improved safety margins and performance.
  • Provides 50,000 ampere interrupting rating for enhanced circuit protection.
  • Cost-effective solution for general-purpose feeder and branch circuits.
  • Direct replacement for Class H fuses, offering a 5x improvement in interrupting capacity.
  • Suitable for residential, smaller commercial, and industrial applications.
  • Robust construction ensures durability and consistent performance under fault conditions.

Specifications

Application
General Purpose
Brand Name
Littelfuse
Series
NLS
Special Features
Economical/low interrupt
Standard
Standard 248-9 UL Listed/CSA
Sub Brand
POWR-GARD NLS Series
Type
Class K5

Similar Products

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NLS300

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NLN500

Sub Brand: POWR-GARD NLN Series

Voltage Rating: 600 V

Series: NLN

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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.