Littelfuse 0239.400MXEP - SLO-BLO GLASS BODY M-PACK .400A 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

0239.400MXEP

UPC: 079458909388

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Minimum Qty: 1000

Multiplier: 1000

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Overview

The **Littelfuse 0239.400MXEP SLO-BLO Glass Cartridge Fuse** is a high-performance, time-delay protection solution designed for sensitive electronic circuits where temporary current surges are common but sustained overloads must be prevented. This **5x20mm axial lead fuse** combines a **0.4A current rating** with a **slow-blow (SLO-BLO) characteristic**, allowing brief inrush currents while ensuring long-term circuit safety. Engineered to meet **UL/CSA/ANCE 248 standards**, the fuse delivers reliable overcurrent protection in a compact, glass-body design that is **RoHS compliant and lead-free**, making it ideal for modern industrial, automotive, and electronic applications. **Key Features and Benefits:** - **Precision Time-Delay Protection:** The **SLO-BLO design** allows temporary current surges (e.g., motor startups, capacitor charging) while interrupting sustained overloads, preventing nuisance tripping in sensitive circuits. This is critical for applications where momentary current spikes are normal but prolonged overcurrent could damage components. - **Compact 5x20mm Axial Lead Design:** The **axial lead configuration** simplifies installation in PCB-mounted or chassis-mounted applications, offering flexibility in tight spaces. The **glass body** provides visual confirmation of fuse status and robust dielectric strength, while the **0.4A rating** ensures precise current limitation for low-power electronics. - **Compliance with Global Standards:** Certified to **UL/CSA/ANCE 248**, this fuse meets rigorous safety and performance benchmarks for overcurrent protection. The **RoHS and lead-free compliance** aligns with modern environmental regulations, making it suitable for global markets and sustainable design initiatives. - **Wide Application Versatility:** Ideal for **industrial control systems, power supplies, automotive electronics, telecommunications equipment, and consumer appliances**, the **0239.400MXEP** is trusted in environments where reliability and precision are paramount. Common use cases include **motor protection circuits, LED drivers, battery management systems, and PLCs**. - **Manufacturer Trust and Reliability:** Littelfuse is a **global leader in circuit protection**, with decades of expertise in developing fuses that meet the demands of harsh industrial and automotive environments. The **SLO-BLO series** is a benchmark for time-delay fuses, ensuring consistent performance across diverse applications. **Why Choose the Littelfuse 0239.400MXEP?** Professionals select this fuse for its **balanced response to transient and sustained overcurrents**, reducing downtime in critical systems. The **axial lead design** facilitates easy integration into existing designs, while the **glass body** allows for visual inspection of the fuse element. Unlike standard fast-acting fuses, the **SLO-BLO characteristic** prevents unnecessary interruptions, making it the preferred choice for circuits with inductive loads or inrush currents. **Installation and Selection Considerations:** When selecting a fuse, consider the **maximum continuous current** of your circuit, the **duration and magnitude of expected surges**, and the **environmental conditions** (e.g., temperature, vibration). The **0.4A rating** makes this fuse suitable for low-power applications, but always verify compatibility with your system’s specifications. For installation, ensure proper **axial lead alignment** and secure mounting to prevent mechanical stress on the fuse body. Littelfuse provides detailed **datasheets and application notes** to guide engineers in optimal fuse selection and circuit design. **Industry Applications:** - **Industrial Automation:** Protects control circuits, sensors, and actuators from overcurrent events in PLCs and motor drives. - **Automotive Electronics:** Used in infotainment systems, ECUs, and lighting circuits where temporary surges are common. - **Power Supplies:** Safeguards transformers, rectifiers, and voltage regulators from overloads in SMPS and linear power supplies. - **Telecommunications:** Ensures reliability in network equipment, routers, and base stations by preventing damage from transient currents. - **Consumer Electronics:** Ideal for chargers, adapters, and small appliances where space constraints and precise protection are critical. With its **proven performance, global certifications, and Littelfuse’s reputation for quality**, the **0239.400MXEP SLO-BLO Glass Cartridge Fuse** is a trusted solution for engineers and technicians seeking **reliable, time-delay overcurrent protection** in demanding applications. Whether you’re designing a new system or replacing an existing fuse, this product delivers the **precision, durability, and compliance** required for modern electronic protection.
  • 0.4A current rating with slow-blow (SLO-BLO) characteristic for temporary surge tolerance
  • 5x20mm axial lead glass body design for easy PCB/chassis mounting
  • UL/CSA/ANCE 248 certified for global compliance and safety
  • RoHS compliant and lead-free for environmental sustainability
  • Ideal for industrial control, automotive electronics, power supplies, and telecommunications

Specifications

Application
electronic equipment & appliances
Brand Name
Littelfuse
Current Rating
0.4 A
Material
Glass
Series
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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Fuse Holder Modulostar® Size 10x38 IEC 690VAC 690VDC 3-Pole IP20

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9F61 Size B Clips 1.6in

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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 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.