Littelfuse 239005P - 239 SLO-BLO GLASS BODY FUSE 5A. 5x20mm time-Lag glass body cartridge fuse designed to JL specification. Features: Designed to UL/CSA/ANCE 248 Standard. Available in cartridge and axial lead format RoHS compliant and lead-free.
Littelfuse

239005P

Alternate Item Number: 0239005.VXP

UPC: 079458909913


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Overview

The **Littelfuse 239 SLO-BLO 5A 5x20mm time-lag glass body cartridge fuse** is a high-performance overcurrent protection solution engineered for industrial and commercial electrical systems. Designed to meet stringent **UL/CSA/ANCE 248 standards**, this fuse combines reliability, precision, and environmental compliance in a compact 5x20mm glass body format. Its **time-lag (SLO-BLO) design** allows temporary overloads—such as startup surges in motors or transformers—without nuisance tripping, ensuring uninterrupted operation in critical applications. **Key Features and Benefits:** - **Time-Lag Performance:** The SLO-BLO design provides delayed response to brief overloads, protecting sensitive equipment from false trips while still interrupting sustained overcurrent conditions. This is particularly valuable in applications with inductive loads, such as motors, solenoids, or transformers, where inrush currents can exceed nominal ratings temporarily. - **Glass Body Construction:** The transparent glass body enables visual inspection of the fuse element, simplifying diagnostics and maintenance. It also offers excellent dielectric strength and thermal stability, making it suitable for high-temperature environments. - **Versatile Mounting Options:** Available in both **cartridge and axial lead formats**, the 239 fuse accommodates a wide range of panel designs and mounting configurations. This flexibility reduces inventory complexity and streamlines installation across diverse systems. - **Global Compliance:** Certified to **UL/CSA/ANCE 248**, this fuse meets international safety and performance standards, ensuring seamless integration into global projects. Its **RoHS and lead-free construction** aligns with modern environmental regulations, supporting sustainable manufacturing practices. - **Industry-Tested Reliability:** Littelfuse is a trusted name in circuit protection, with decades of expertise in designing fuses for harsh industrial environments. The 239 series is a proven choice for engineers and technicians who demand consistent performance in power distribution, control panels, and machinery. **Typical Applications:** The Littelfuse 239 SLO-BLO fuse is ideal for protecting components in: - **Power Supplies:** Including switch-mode power supplies (SMPS), battery chargers, and DC-DC converters where inrush currents are common. - **Motor Controls:** Such as starters, contactors, and variable frequency drives (VFDs) that experience high startup currents. - **Industrial Machinery:** Including CNC machines, conveyors, and automation systems where reliable overcurrent protection is critical. - **Lighting Systems:** Especially LED drivers and fluorescent ballasts, where transient surges can occur during startup. - **Telecom and Networking Equipment:** Protecting sensitive electronics in servers, routers, and data center infrastructure. **Selection and Installation Considerations:** When choosing a fuse, professionals prioritize **current rating, voltage rating, and response time**. The 5A rating of the 239 fuse makes it suitable for protecting circuits with continuous loads up to 5A, while its time-lag characteristic ensures compatibility with equipment that has high inrush currents. The **5x20mm size** is a standard form factor in many industries, ensuring broad compatibility with fuse holders and panels. For installation, always verify the fuse holder’s compatibility with the 5x20mm glass body format. Ensure proper seating to maintain electrical contact and prevent arcing. In high-vibration environments, consider using fuse holders with locking mechanisms to prevent dislodging. Regular inspection of the fuse element—visible through the glass body—can help identify degradation or failures before they lead to downtime. **Why Choose Littelfuse?** Littelfuse is a global leader in circuit protection, with a reputation for innovation and reliability. The company’s fuses are used in mission-critical applications across aerospace, automotive, industrial, and renewable energy sectors. The 239 SLO-BLO series exemplifies Littelfuse’s commitment to delivering products that balance performance, safety, and environmental responsibility. By selecting Littelfuse, engineers gain access to a trusted partner with extensive technical support, global distribution, and a legacy of protecting electrical systems worldwide. For applications requiring **time-lag protection in a compact, compliant, and reliable package**, the Littelfuse 239 SLO-BLO 5A 5x20mm fuse is an industry-standard choice. Its combination of performance, versatility, and compliance makes it a go-to solution for professionals who demand the best in circuit protection.
  • 5A time-lag (SLO-BLO) design for temporary overload tolerance
  • 5x20mm glass body for visual inspection and thermal stability
  • UL/CSA/ANCE 248 certified for global compliance
  • Available in cartridge and axial lead formats for versatility
  • RoHS compliant and lead-free for environmental safety

Specifications

Amperage Rating
10 AMPS
Application
General Purpose
Brand Name
Littelfuse
Special Features
Fast-Acting
Standard
Standard 248-8 UL Listed/CSA
Sub Brand
POWR-GARD JLS Series
Type
Class J
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 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 1500VAC 1500VDC 400A 1-Pole Stud M8

1SCM8

Fuse Block 1500VAC 1500VDC 400A 1-Pole Stud M8
Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

E1062696

Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20
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.
9F61 Size B Clips 1.6in

9F61BWW460

9F61 Size B Clips 1.6in

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.