Littelfuse 0239001.MXEP - SLO-BLO GLASS BODY M-PACK 1A AXIAL. 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

0239001.MXEP

UPC: 079458909678


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Overview

The **Littelfuse 1A 5x20mm SLO-BLO Glass Cartridge Fuse (SKU: 0239001.MXEP)** is a high-performance time-lag fuse designed to provide precise overcurrent protection for sensitive electronic systems. Engineered to meet the stringent **UL/CSA/ANCE 248** standards, this RoHS-compliant and lead-free fuse delivers reliable circuit safeguarding in demanding industrial and commercial applications. Its **5x20mm glass body** construction ensures durability and visual inspection capability, while the **axial lead configuration** simplifies installation in tight spaces or high-density circuit designs. Unlike standard fast-acting fuses, the SLO-BLO design incorporates a deliberate time delay, allowing brief current surges—common in startup conditions or transient events—to pass without interruption. This makes it ideal for protecting components such as transformers, motors, power supplies, and control circuits where momentary overloads are expected but sustained overcurrent must be prevented. The **time-lag characteristic** of this fuse is particularly valuable in applications where inrush currents are significant, such as in **industrial automation, telecommunications, automotive electronics, and renewable energy systems**. For example, in a power distribution panel, the Littelfuse SLO-BLO fuse can tolerate the high inrush current of a motor starting up while still interrupting a fault condition to prevent damage to wiring or downstream equipment. Its **glass body** not only provides mechanical strength but also allows for quick visual confirmation of fuse status—a critical feature in maintenance and troubleshooting scenarios. The **axial lead design** further enhances compatibility with standard fuse holders and PCB-mounted applications, reducing installation complexity and minimizing downtime during repairs or replacements. Littelfuse, a globally recognized leader in circuit protection, has designed this fuse to meet the rigorous demands of modern electrical systems. The **0239001.MXEP** model is part of the company’s extensive portfolio of **SLO-BLO fuses**, which are trusted by engineers and technicians worldwide for their consistency, reliability, and adherence to international safety standards. Whether deployed in **control panels, test equipment, or industrial machinery**, this fuse ensures long-term protection against overcurrent events while maintaining compliance with environmental regulations like RoHS. Professionals selecting this fuse benefit from Littelfuse’s decades of expertise in fuse technology, ensuring that their systems are safeguarded against both transient surges and sustained faults. Installation is straightforward, requiring only basic tools and adherence to standard electrical safety practices. The **5x20mm cartridge format** is widely supported across fuse holders, clips, and blocks, making it a versatile choice for retrofits or new designs. When specifying this fuse, engineers should consider the **nominal current rating (1A)**, the **time-lag characteristic**, and the **voltage rating** (as applicable to the application) to ensure optimal performance. Regular inspection of the glass body for discoloration or damage is recommended, as these indicators can signal potential issues before a failure occurs. By choosing the **Littelfuse 1A SLO-BLO Glass Cartridge Fuse**, users gain a trusted solution that balances performance, safety, and environmental responsibility—backed by a manufacturer with a reputation for innovation and reliability in circuit protection.
  • 1A time-lag protection with SLO-BLO design for transient surge tolerance
  • 5x20mm glass body for durability and visual inspection capability
  • Axial lead configuration for easy installation in fuse holders and PCBs
  • Compliant with UL/CSA/ANCE 248 standards for global safety certification
  • RoHS-compliant and lead-free for environmental and regulatory alignment

Specifications

Application
electronic equipment & appliances
Brand Name
Littelfuse
Connection Type
Axial Lead
Current Rating
1 A
Material
Glass
Series
SLO-BLO Glass Body M-Pack
Size
5x20mm
Special Features
Slo-Blo
Standard
UL/CSA/ANCE 248 Standard
Sub Brand
239 Series
Type
5 x 20 mm UL/CSA Slo-Blo
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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.