Littelfuse SE-105LTC - 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-105LTC

Alternate Item Number: SE-105LTC

UPC: 079458987928


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Overview

The Littelfuse SE-105LTC is a critical safety component designed for resistance-grounded electrical systems, particularly in demanding industrial environments such as underground mining. This advanced device functions as both a ground-wire monitor and a ground-fault relay, providing continuous and vigilant protection for portable equipment operating on trailing cables rated at 5 kV and under. Its primary role is to ensure the integrity of the ground conductor, a vital safety feature that prevents hazardous voltages from accumulating on equipment chassis in the event of a ground fault. In resistance-grounded systems, the SE-105LTC plays a crucial role in maintaining system stability while offering robust fault detection. By constantly monitoring the continuity and resistance of the ground path, the relay can quickly identify any breaks or significant increases in ground resistance. This proactive monitoring is essential for preventing dangerous situations where a fault could energize exposed metal parts, posing a severe electrocution risk to personnel. The SE-105LTC's sophisticated design ensures rapid response, minimizing the duration and impact of any detected ground fault. Key features and benefits of the Littelfuse SE-105LTC include: * **Dual Functionality:** Combines ground-wire monitoring and ground-fault relaying for comprehensive protection. * **Continuous Monitoring:** Actively checks the ground conductor's integrity, not just during fault conditions. * **Hazardous Voltage Protection:** Safeguards portable equipment and personnel from dangerous voltages caused by ground faults. * **Designed for Resistance-Grounded Systems:** Optimized for the specific characteristics and safety requirements of these systems. * **Ideal for Mining Applications:** Specifically engineered for the harsh and safety-critical conditions found in underground mining, particularly for trailing cables. * **5 kV System Compatibility:** Suitable for a wide range of portable equipment operating at or below this voltage level. Littelfuse is a globally recognized leader in circuit protection and switching solutions, renowned for its commitment to quality, reliability, and innovation. The SE-105LTC exemplifies this dedication, offering a dependable solution for applications where electrical safety is paramount. Its robust construction and precise monitoring capabilities make it a trusted choice for professionals seeking to mitigate risks associated with ground faults in challenging operational settings. For applications involving higher voltages or extended cable lengths, Littelfuse offers the SE-134C/SE-135 series, providing scalable protection solutions for diverse industrial needs. Implementing the SE-105LTC is a proactive step towards enhancing operational safety, reducing equipment damage, and ensuring compliance with stringent safety regulations in critical industries.
  • Combination ground-wire monitor and ground-fault relay
  • Continuously monitors ground conductor integrity
  • Protects portable equipment from hazardous voltages
  • Designed for resistance-grounded systems up to 5 kV
  • Ideal for underground mining trailing cable applications

Specifications

Application
Mining
Brand Name
Littelfuse
Special Features
For trailing cables 5 kV
Standard
CSA UL
Sub Brand
SE 105 Series
Type
Trailing Cable Protection
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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.