Littelfuse FLSR040 - FLSR040 is a Class RK5 fuse with an ampere rating of 40 and cartridge-style construction.
Littelfuse

FLSR040

Alternate Item Number: FLSR040.T

UPC: 079458170757


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Overview

The Littelfuse FLSR040 is a high-performance Class RK5 fuse engineered to deliver robust and reliable circuit protection in demanding industrial and commercial environments. As a critical component in safeguarding electrical systems, this 40A cartridge-style fuse is designed to withstand rigorous operating conditions, ensuring the integrity of sensitive equipment and preventing costly downtime. Littelfuse is a globally recognized leader in circuit protection, and the FLSR040 exemplifies their commitment to quality and innovation. This fuse is specifically designed for applications where superior overcurrent protection is paramount. Its Class RK5 rating signifies a high interrupting rating, making it suitable for systems with significant fault current potential. The cartridge-style construction offers a compact and secure solution for integration into various electrical panels and enclosures. Key features and benefits of the Littelfuse FLSR040 include: * **High Interrupting Rating:** Class RK5 fuses provide a substantial interrupting capacity, crucial for protecting equipment from severe short-circuit events. * **40A Current Rating:** Precisely calibrated to protect circuits designed for a 40-ampere load, preventing nuisance tripping while offering effective overcurrent protection. * **Cartridge-Style Construction:** Facilitates easy installation and replacement, ensuring a secure fit within fuse holders and minimizing potential contact issues. * **Robust Design:** Built to endure the harsh conditions often found in industrial settings, offering durability and long-term reliability. * **Broad Application Range:** Ideal for use in power distribution panels, motor control circuits, HVAC systems, and other critical industrial machinery where consistent and dependable protection is essential. Selecting the correct fuse is a fundamental aspect of electrical system design and maintenance. The Littelfuse FLSR040, with its specific ampere rating and Class RK5 designation, allows engineers and technicians to implement precise protection strategies. This fuse acts as a sacrificial device, designed to open the circuit and interrupt the flow of current when an overcurrent condition, such as an overload or short circuit, is detected. This action prevents damage to downstream components, reduces the risk of fire, and enhances overall operational safety. Industries that rely on the dependable performance of fuses like the FLSR040 include manufacturing, petrochemical, utilities, and data centers. In these sectors, the continuous operation of electrical equipment is vital, and the failure of a single component can have significant financial and operational repercussions. The Littelfuse FLSR040 provides peace of mind, knowing that critical electrical infrastructure is protected by a trusted and effective circuit protection solution. Its straightforward installation and replacement process also contribute to reduced maintenance overhead, further enhancing its value proposition for industrial applications. When specifying circuit protection, choosing a reputable manufacturer like Littelfuse and a product with the appropriate specifications, such as the FLSR040, is a critical step in ensuring system reliability and safety.
  • Littelfuse FLSR040 Class RK5 fuse
  • 40 Ampere (A) current rating
  • Cartridge-style construction for easy installation
  • Designed for industrial and commercial circuit protection
  • Provides reliable overcurrent and short-circuit protection

Specifications

Application
General Purpose
Brand Name
Littelfuse
Special Features
Time-Delay
Standard
Standard 248-12 UL Listed/CSA
Sub Brand
POWR-GARD FLSR Series
Type
Class RK5
Package Weight (Imperial)
0.323 L
Package Weight (Metric)
146.900 g
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9F61 Size B Clips 1.6in

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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.

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 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.