Authorized Littelfuse Distributor
Littelfuse NLS450 - 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 NLS450 NLS series fuses provide low cost protection for general-purpose feeder and branch…

Alternate Item Number: 0NLS450.X

UPC: 079458370959


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BrochureTechnical BulletinTechnical Drawing3D CAD Model (STEP)Specification Sheet

Contact for Pricing

Call +1 (262) 252-1600 (toll-free 877-268-3700) or email [email protected] for pricing and availability.

Overview

The Littelfuse NLS450 (SKU: NLS450) from the NLS Series delivers cost-effective, high-performance overcurrent protection for general-purpose feeder and branch circuits in residential, commercial, and smaller industrial applications. Engineered with a 50,000 ampere interrupting rating (50kA IR), the NLS450 significantly outperforms older Class H fuses, which are limited to just 10,000 amperes. This makes it an ideal upgrade for systems where available short-circuit currents do not exceed 50kA, ensuring enhanced safety and reliability without the need for costly replacements. The NLS450 is designed as a direct replacement for Class H fuses, offering seamless integration into existing systems while providing superior fault protection. Its robust construction meets stringent safety standards, making it suitable for a wide range of applications, including lighting circuits, small motor controls, and power distribution panels. Unlike traditional fuses, the NLS450’s 50kA IR rating ensures it can safely interrupt higher fault currents, reducing the risk of equipment damage and electrical fires. Littelfuse, a trusted leader in circuit protection, guarantees the NLS450’s reliability and longevity. This fuse is particularly valuable for budget-conscious projects, as it eliminates the need for expensive upgrades to higher-rated fuse classes while maintaining compliance with modern safety regulations. For applications requiring advanced features such as time-delay or current limitation, Littelfuse offers other specialized fuse series. However, for general-purpose protection and a cost-effective upgrade path from Class H fuses, the NLS450 is a dependable and efficient solution.
  • 50,000 ampere interrupting rating (50kA IR) for superior fault protection
  • Direct replacement for Class H fuses (10kA IR) in general-purpose circuits
  • Suitable for residential, commercial, and smaller industrial applications
  • Cost-effective upgrade without requiring system redesigns
  • Robust construction meets stringent safety and performance standards

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

E1062696

Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20
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 600VAC 600VDC Class CC 30A 3-Pole Pressure Plate with Reinforced Clip

30323R

Fuse Block 600VAC 600VDC Class CC 30A 3-Pole Pressure Plate with Reinforced Clip
9F61 Size B Clips 1.6in

9F61BWW460

9F61 Size B Clips 1.6in
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.

Frequently Asked Questions

What is the cost of the MROplus program?

The MROplus program is absolutely FREE for customers.

How do I get started with the MROplus program?

Complete a request form with your current fuse inventory and contact your local Littelfuse Sales Representative, 1-800-TEC-FUSE, or [email protected].

What is the MROplus program and its benefits?

The MROplus program helps customers lower costs, increase plant safety, decrease downtime, and reduce inventory by analyzing fuse inventories and optimizing circuit protection.

What reports are included in the MROplus Program?

The program includes a Total Cost Savings Report, Consolidated Part Number Report, SKU Reduction Report, and Fuse Performance Summaries.

How does MROplus help reduce electrical hazards?

It identifies inadequate fuses and upgrades them to current-limiting circuit protection to reduce Hazard Risk Categories (HRC), allowing for less Personal Protective Equipment (PPE) during repairs.

How can MROplus improve productivity?

By converting to indicating fuses and consolidating inventory, MROplus provides fast, visible identification for fuse replacement, saving time and money.

What are Littelfuse high-speed semiconductor fuses used for?

They protect critical power electronics from over-currents that may cause damage to equipment.

What does Littelfuse POWR-GARD offer?

POWR-GARD offers a complete circuit protection portfolio, including time-saving indication products for immediate visual blown-fuse identification.

What do Littelfuse protection relays do?

These relays safeguard equipment and personnel to prevent damage, downtime, or injury due to electrical faults.

What are some examples of fuses that can be replaced by Littelfuse products?

The document lists several fuses like Littelfuse FLSR, FLNR, FLM, FLQ, and Bussmann LPSRK, FRS, NOS, FRN(R), REN*, KTN(R)*, TRS, RFS*, OTS*, RF* that can be substituted.

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.