Littelfuse 344405A - INDICATING PANEL 344 R Knob 200-250V. Blown-Fuse Indicating Panel Mount Fuseholder for 3AG Fuses (Round Knob).
Littelfuse

344405A

Alternate Item Number: 03440405X

UPC: 079458107012


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Overview

The Littelfuse 344405A Panel Mount Fuseholder is a high-performance, blown-fuse indicating solution engineered for 3AG (1.25" x 0.25") fuses in demanding industrial environments. Designed with a rugged panel mount construction and a distinctive round knob indicator, this fuseholder provides immediate visual confirmation of fuse status, eliminating the need for manual inspection and reducing downtime in critical systems. With a voltage rating of 200-250V, the 344405A is optimized for use in control panels, power distribution units, motor controllers, and other high-reliability applications where uninterrupted operation is essential. Key features of the Littelfuse 344405A include its user-friendly round knob design, which not only secures the fuse in place but also serves as a clear visual indicator when a fuse has blown. The indicator mechanism is engineered to provide a high-contrast signal, ensuring quick identification even in low-light or high-vibration conditions typical of industrial settings. This feature is particularly valuable in applications where rapid fault detection is critical to preventing equipment damage or safety hazards. The 344405A is part of Littelfuse’s industry-leading line of fuseholders, a brand synonymous with quality and reliability in electrical protection. Littelfuse has been a trusted name in circuit protection for over a century, serving markets that include industrial automation, renewable energy, telecommunications, and transportation. Professionals across these industries rely on Littelfuse products for their proven performance, compliance with international standards (such as UL, IEC, and CSA), and compatibility with a wide range of fuse types and ratings. Installation of the 344405A is straightforward, thanks to its panel mount design, which accommodates standard 1/4" panel cutouts. The fuseholder is secured using a threaded bushing and nut, ensuring a stable and vibration-resistant connection. This design simplifies retrofitting into existing systems or integration into new panel designs, making it a versatile choice for engineers and technicians. The 200-250V voltage rating makes it suitable for use in both AC and DC applications within this range, including control circuits, power supplies, and instrumentation panels. Typical applications for the Littelfuse 344405A include: - **Control Panels:** Providing visual fuse status indication in PLC and relay control systems. - **Power Distribution:** Safeguarding branch circuits in industrial switchgear and distribution boards. - **Motor Control:** Protecting motor starters and variable frequency drives (VFDs) from overcurrent conditions. - **Test Equipment:** Ensuring reliable operation in laboratory and test bench environments. - **Renewable Energy Systems:** Monitoring fuse integrity in solar inverters and wind turbine controllers. Selecting the right fuseholder is a critical decision in electrical system design, as it directly impacts system reliability, safety, and maintenance efficiency. The Littelfuse 344405A stands out for its combination of durability, ease of use, and clear indication features, making it an ideal choice for professionals who prioritize both performance and operational simplicity. Whether used in a new installation or as a replacement in an existing system, the 344405A delivers the reliability and functionality required in modern industrial applications. Backed by Littelfuse’s global distribution network and technical support, the 344405A is available through authorized distributors worldwide, ensuring quick access to this essential component. For engineers, technicians, and procurement professionals seeking a proven, high-quality fuseholder, the Littelfuse 344405A represents a smart investment in system protection and operational efficiency.
  • Panel mount fuseholder for 3AG (1.25" x 0.25") fuses
  • 200-250V voltage rating for AC/DC applications
  • Round knob indicator for clear blown-fuse detection
  • Rugged construction for industrial environments
  • UL, IEC, and CSA compliant for global standards

Specifications

Amperage Rating
15 Amperes
Brand Name
Littelfuse
Special Features
Blown fuse indicator
Standard
UL Listed CSA
Sub Brand
344/348 Series
Type
Blown Fuse Indicating / Low Profile Holders for 3AG Fuses
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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.