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

SE-325S

Alternate Item Number: SE-325S

UPC: 079458988277


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Overview

The Littelfuse SE-325S Neutral Grounding Resistor Monitor is a critical component for ensuring the safety and reliability of industrial electrical systems. Designed by Littelfuse, a globally recognized leader in circuit protection, the SE-325S provides robust and precise detection of ground faults within a neutral grounding resistor circuit. This advanced monitoring solution is essential for preventing equipment damage, minimizing downtime, and maintaining operational continuity in a wide range of industrial environments. At its core, the SE-325S operates with a standard 120 VAC supply voltage, making it compatible with most common industrial power distribution systems. Its primary function is to continuously monitor the integrity of the neutral grounding resistor. When a ground fault occurs, the resistance of the grounding path changes, and the SE-325S is engineered to detect these subtle yet critical deviations. 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 of the protected system. This adjustability ensures that nuisance tripping is minimized while still providing rapid and reliable detection of actual fault conditions. Key benefits of integrating the Littelfuse SE-325S into your electrical infrastructure include enhanced system protection, improved operational safety, and reduced maintenance costs. By detecting ground faults early, the monitor helps prevent catastrophic failures, arc flashes, and potential fires that can result from uncontrolled ground currents. This proactive approach safeguards sensitive electronic equipment, motors, and other critical assets from damage, thereby extending their lifespan and reducing the likelihood of costly repairs or replacements. The SE-325S is particularly well-suited for applications in: * Manufacturing facilities * Power generation plants * Petrochemical and chemical processing * Data centers * Hospitals and other critical infrastructure * Any industrial setting where reliable grounding is paramount. Its compact and rugged design facilitates straightforward installation into existing control panels and switchgear. The intuitive interface and adjustable settings simplify setup and ongoing management. Professionals rely on Littelfuse for their commitment to quality, innovation, and dependable performance, and the SE-325S is a testament to this reputation. By choosing the SE-325S, you are investing in a proven solution that upholds the highest standards of electrical safety and system integrity. Ensure your operations are protected with the advanced grounding resistor monitoring capabilities of the Littelfuse SE-325S.
  • Monitors neutral grounding resistor integrity for enhanced system safety.
  • 120 VAC supply voltage for broad industrial compatibility.
  • Adjustable ground-fault trip level from 0.5 A to 4.0 A for precise fault detection.
  • Manufactured by Littelfuse, a trusted leader in circuit protection.
  • Designed for reliable performance in demanding industrial applications.

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
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.