Littelfuse SE-100T - The SE-100T is a ground-fault-relay test unit designed to test the current pickup level of ground-fault protection. The tester injects current through the window of installed ground-fault current transformers to verify the operation of ground-fault monitors and relays. It is used on substations, motor control centers (MCCs), central distribution panels, switchboards, and test benches to verify relay operation. The SE-100T tests the entire ground-fault circuit including current transformers, wiring, ground-fault relay and the operation of the interrupting device. It is recommended to test every relay and its current interrupting device annually.
Littelfuse

SE-100T

Alternate Item Number: SE-100T

UPC: 079458987867

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Overview

Ensure the integrity and reliability of your critical electrical infrastructure with the Littelfuse SE-100T Ground-Fault-Relay Test Unit. Designed for demanding industrial and utility environments, this robust testing device is engineered to precisely verify the current pickup level of ground-fault protection systems. The SE-100T plays a vital role in maintaining operational safety and preventing costly downtime by ensuring that ground-fault protection circuits function as intended. At its core, the SE-100T operates by injecting a controlled current directly through the window of installed ground-fault current transformers (CTs). This direct injection method bypasses the need to de-energize the entire circuit, allowing for efficient and accurate testing of the complete ground-fault protection loop. By simulating a ground fault condition, the unit validates the responsiveness and accuracy of ground-fault monitors and relays, confirming they will trip at their specified pickup levels. The applications for the Littelfuse SE-100T are extensive and critical across various sectors: * **Substations:** Essential for verifying the ground-fault protection of transformers, switchgear, and other critical equipment in electrical substations. * **Motor Control Centers (MCCs):** Guarantees that ground-fault protection for individual motor circuits within MCCs is fully operational, safeguarding personnel and equipment. * **Central Distribution Panels & Switchboards:** Provides a crucial layer of safety by testing the ground-fault relays responsible for protecting main distribution systems. * **Test Benches:** An indispensable tool for manufacturers and service technicians calibrating and verifying ground-fault protection devices before installation. The SE-100T's comprehensive testing capability extends beyond just the relay itself. It meticulously examines the entire ground-fault circuit, encompassing: * **Current Transformers (CTs):** Verifies the accuracy and functionality of the CTs responsible for sensing ground fault currents. * **Wiring:** Assesses the integrity of the wiring connecting the CTs to the relay. * **Ground-Fault Relay:** Confirms the relay's pickup level and tripping characteristics. * **Interrupting Device:** Crucially, it tests the operation of the associated circuit breaker or other interrupting device to ensure it will open the circuit upon a detected ground fault. Industry best practices and safety standards strongly recommend annual testing of all ground-fault relays and their associated interrupting devices. The Littelfuse SE-100T facilitates adherence to these recommendations, providing a reliable and efficient method to perform these essential checks. By proactively identifying and rectifying any potential weaknesses in your ground-fault protection system, you significantly reduce the risk of electrical hazards, equipment damage, and service interruptions. Trust Littelfuse, a recognized leader in circuit protection, for your critical testing needs.
  • Tests current pickup level of ground-fault protection.
  • Injects current through ground-fault CT windows for verification.
  • Validates operation of ground-fault monitors and relays.
  • Tests entire ground-fault circuit: CTs, wiring, relay, interrupting device.
  • Ideal for substations, MCCs, distribution panels, switchboards, and test benches.

Specifications

Application
NA
Brand Name
Littelfuse
Special Features
Tests the current pickup level of ground-fault protection
Standard
CSA
Sub Brand
SE 100T Series
Type
Relay Test Equipment
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
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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.