Littelfuse SE-325EST - SE-325EST is a neutral-grounding resistor monitor with a supply voltage of 240 ac and a ground-fault trip level of 0.5–4.0 A.
Littelfuse

SE-325EST

Alternate Item Number: SE-325EST

UPC: 079458988222


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Overview

The Littelfuse SE-325EST neutral-grounding resistor monitor is a high-performance solution engineered for precise ground-fault detection in critical industrial electrical systems. Designed to operate with a 240 VAC supply voltage, this monitor delivers reliable performance in power distribution networks, manufacturing facilities, and high-demand environments where electrical integrity is paramount. The SE-325EST features an adjustable ground-fault trip level ranging from 0.5 to 4.0 A, allowing engineers to tailor sensitivity to specific application requirements while minimizing nuisance tripping or undetected faults. Ground-fault monitoring is essential in industrial settings to prevent equipment damage, reduce fire hazards, and ensure personnel safety. The SE-325EST addresses these challenges by continuously monitoring neutral-grounding resistor systems, detecting imbalances that indicate ground faults, and initiating protective responses to isolate faults before they escalate. Its robust design incorporates high-quality components to withstand harsh operating conditions, including temperature fluctuations, electrical noise, and mechanical stress common in industrial environments. Key applications for the Littelfuse SE-325EST include: - Power generation and distribution systems where unplanned outages can disrupt operations - Industrial machinery with sensitive electronic controls requiring rapid fault detection - Commercial buildings with critical infrastructure, such as data centers or healthcare facilities - Renewable energy installations where grounding integrity is crucial for grid stability The monitor’s adjustable trip level makes it versatile for both low- and medium-voltage systems, accommodating a wide range of neutral-grounding resistor configurations. Installation is straightforward, with clear labeling and standardized connections that align with industry best practices. Littelfuse’s reputation for reliability in electrical protection solutions ensures that the SE-325EST meets stringent performance standards, backed by decades of expertise in circuit protection and monitoring technologies. Professionals selecting a neutral-grounding resistor monitor should prioritize accuracy, durability, and ease of integration. The SE-325EST excels in these areas, offering: - High-precision sensing to detect ground faults at early stages - Rugged construction for long-term reliability in demanding environments - Compatibility with existing neutral-grounding systems without extensive modifications - Compliance with industry standards for electrical safety and grounding Littelfuse’s commitment to innovation and quality ensures that the SE-325EST delivers consistent performance, helping organizations maintain operational continuity and regulatory compliance. Whether deployed in a manufacturing plant, utility substation, or renewable energy facility, this monitor provides the critical protection needed to safeguard personnel, equipment, and infrastructure from the risks of ground faults.
  • 240 VAC supply voltage for compatibility with industrial systems
  • Adjustable ground-fault trip level (0.5–4.0 A) for customized sensitivity
  • High-precision sensing for early fault detection and rapid response
  • Rugged design for reliable operation in harsh industrial environments
  • Easy installation and integration with existing neutral-grounding systems

Specifications

Application
Mining
Brand Name
Littelfuse
Current Rating
0.5–4.0 A
Series
SE-325
Special Features
Continuous NGR monitoring
Sub Brand
SE 325 Series
Type
Trailing Cable Protection
Voltage Rating
240 AC
Voltage Rating
240 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.