Littelfuse SE-325DNT - SE-325DNT is a neutral-grounding resistor monitor with a supply voltage of 120 ac-dc and a ground-fault trip level of 0.5–4.0 A.
Littelfuse

SE-325DNT

Alternate Item Number: SE-325DNT

UPC: 079458988109


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Overview

The Littelfuse SE-325DNT Neutral-Grounding Resistor Monitor is a critical component for ensuring the safety and reliability of industrial electrical systems. Designed to detect and alert on ground faults within neutral grounding resistor circuits, this device plays a vital role in preventing equipment damage and personnel hazards. With a versatile supply voltage of 120 AC/DC, the SE-325DNT seamlessly integrates into a wide range of existing industrial power infrastructures. At its core, the SE-325DNT monitors the resistance of the neutral grounding path. When a ground fault occurs, it introduces a deviation in this resistance, which the SE-325DNT is engineered to detect. The adjustable ground-fault trip level, ranging from 0.5 to 4.0 Amperes, allows for precise calibration to suit the specific requirements and sensitivity needs of different applications. This granular control is essential for distinguishing between normal operating conditions and actual fault events, thereby minimizing nuisance tripping while maximizing protection. Key features and benefits of the Littelfuse SE-325DNT include: * **Precise Ground Fault Detection:** Accurately identifies ground faults within the neutral grounding resistor circuit. * **Adjustable Trip Levels:** Configurable from 0.5 A to 4.0 A for tailored system protection. * **Wide Supply Voltage Compatibility:** Operates on 120 AC/DC, offering flexibility in installation. * **Enhanced System Stability:** Contributes to the overall stability and integrity of the electrical grid. * **Equipment and Personnel Protection:** Safeguards valuable industrial machinery and ensures a safer working environment. This monitor is indispensable in industries such as manufacturing, petrochemical, utilities, and data centers, where uninterrupted power and robust grounding are paramount. Proper grounding is fundamental to the operation of sensitive electronic equipment, the prevention of arc flashes, and the effective functioning of protective relays. The SE-325DNT provides an essential layer of monitoring for these critical grounding systems. Littelfuse is a globally recognized leader in circuit protection and power control solutions, renowned for its commitment to quality, innovation, and reliability. The SE-325DNT neutral-grounding resistor monitor exemplifies this dedication, offering a robust and dependable solution for demanding industrial environments. Its straightforward installation and intuitive operation make it a practical choice for electrical engineers and maintenance professionals seeking to enhance their grounding system's performance and safety.
  • Littelfuse SE-325DNT Neutral-Grounding Resistor Monitor
  • Supply Voltage: 120 AC/DC
  • Adjustable Ground-Fault Trip Level: 0.5–4.0 A
  • Designed for industrial electrical system grounding applications
  • Enhances safety and system stability by detecting ground faults

Specifications

Application
Mining
Brand Name
Littelfuse
Current Rating
0.5–4.0 A
Special Features
Continuous NGR monitoring
Sub Brand
SE 325 Series
Type
Trailing Cable Protection
Voltage Rating
120 VAC/DC
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.