Littelfuse SE-105D - The SE-105/SE-107 is a combination ground-wire monitor and ground-fault relay for resistance-grounded systems. It continuously monitors the integrity of the ground conductor to protect portable equipment from hazardous voltages caused by ground faults. The SE-105/SE-107 is an excellent choice for trailing cables 5 kV and under in underground mining applications. For higher voltages or long-cable applications, see the SE-134C/SE-135.
Littelfuse

SE-105D

Alternate Item Number: SE-105D

UPC: 079458987874

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Overview

The Littelfuse SE-105D is a high-performance ground-wire monitor and ground-fault relay engineered for resistance-grounded systems, delivering unmatched protection for industrial and mining applications. Designed to safeguard portable equipment from hazardous voltages caused by ground faults, this rugged device continuously monitors the integrity of the ground conductor in trailing cables rated up to 5 kV. As a critical component in underground mining operations, the SE-105D ensures compliance with stringent safety standards while minimizing equipment damage and downtime. Ground-fault relays like the SE-105D are essential in high-risk environments where electrical faults can lead to catastrophic failures, fires, or personnel hazards. By detecting ground faults at the earliest stage, this relay enables rapid intervention, preventing escalation into larger system failures. The SE-105D is particularly well-suited for resistance-grounded systems, where the neutral point is intentionally grounded through a resistor to limit fault currents while maintaining system stability. This design is prevalent in mining, manufacturing, and heavy industrial settings where equipment mobility and harsh operating conditions demand reliable protection. Key features of the Littelfuse SE-105D include: - **Continuous ground conductor monitoring** to detect open or high-resistance ground paths before they compromise safety. - **High-precision fault detection** for trailing cables in underground mining, where cable integrity is critical to operational safety. - **Robust construction** designed to withstand the demanding conditions of industrial and mining environments, including shock, vibration, and temperature extremes. - **Easy integration** with existing resistance-grounded systems, ensuring seamless compatibility without extensive modifications. - **Compliance with industry standards** such as MSHA (Mine Safety and Health Administration) and other regulatory requirements for ground fault protection. The SE-105D is an ideal solution for underground mining applications, where trailing cables are exposed to abrasion, moisture, and mechanical stress. Its ability to monitor ground conductor integrity in real time makes it a trusted choice for protecting personnel and equipment from ground faults, which can otherwise lead to arc flashes, equipment damage, or even fatal accidents. Unlike generic ground-fault relays, the SE-105D is specifically optimized for resistance-grounded systems, offering superior sensitivity and response times tailored to the unique challenges of mining and industrial operations. Littelfuse, a global leader in circuit protection and electrical safety solutions, has built a reputation for reliability and innovation in industrial electrical protection. With decades of experience serving critical industries such as mining, oil and gas, and manufacturing, Littelfuse’s products are trusted by professionals worldwide to enhance safety and operational efficiency. The SE-105D exemplifies this commitment, providing a dependable, field-proven solution for ground fault monitoring in high-stakes environments. For professionals tasked with selecting ground-fault protection for resistance-grounded systems, the Littelfuse SE-105D offers a combination of precision, durability, and ease of use that is unmatched in its class. Whether deployed in underground mines, processing plants, or other industrial facilities, this relay delivers the performance and reliability needed to safeguard both assets and personnel.
  • Continuous ground conductor integrity monitoring for trailing cables up to 5 kV
  • Designed for resistance-grounded systems in underground mining applications
  • Early detection of ground faults to prevent equipment damage and enhance safety
  • Robust construction for harsh industrial and mining environments
  • Compliant with MSHA and other regulatory safety standards

Specifications

Application
Mining
Brand Name
Littelfuse
Series
SE-105/SE-107
Special Features
For trailing cables 5 kV
Standard
CSA UL
Sub Brand
SE 105 Series
Type
Trailing Cable Protection
Voltage Rating
5 kV
Package Dimensions (L x W x H)
3.9 IN x 4.3 IN x 5.9 IN
Package Dimensions (L x W x H)
9.906 cm x 10.922 cm x 14.986 cm
Package Weight (Imperial)
1.980 L
Package Weight (Metric)
0.900 kg
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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.