Littelfuse SE-325ESNT - SE-325ESNT 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-325ESNT

Alternate Item Number: SE-325ESNT

UPC: 079458988215


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Overview

The Littelfuse SE-325ESNT Neutral Grounding Resistor Monitor is a critical component for ensuring the safety and reliability of industrial power distribution systems. Engineered by Littelfuse, a recognized leader in circuit protection and power control, this monitor provides essential detection of ground faults within neutral grounding resistor circuits. Its robust design and precise monitoring capabilities make it an indispensable tool for preventing equipment damage, minimizing downtime, and safeguarding personnel. The SE-325ESNT operates with a supply voltage of 240 VAC, making it suitable for a wide range of industrial electrical infrastructure. The core functionality of this device lies in its ability to detect deviations from normal ground resistance, specifically by monitoring the current flowing through the neutral grounding resistor. When a ground fault occurs, the current through the resistor increases, and the SE-325ESNT is designed to trip when this current exceeds a user-defined threshold. This adjustable ground-fault trip level, ranging from 0.5 to 4.0 Amperes, allows for fine-tuning the sensitivity to match the specific requirements of the protected system, thereby minimizing nuisance trips while ensuring prompt detection of genuine faults. Proper grounding is paramount in industrial settings to mitigate the risks associated with transient overvoltages, lightning strikes, and insulation failures. A neutral grounding resistor plays a crucial role in limiting the magnitude of fault current during a ground fault, which helps to stabilize system voltage and reduce the stress on equipment. The Littelfuse SE-325ESNT monitor actively supervises the integrity of this grounding path. By providing early warning or tripping the circuit upon detecting an abnormal ground-fault current, it prevents the propagation of faults that could lead to catastrophic failures, fires, or damage to sensitive electronic components. This proactive approach to fault detection is vital for maintaining operational continuity and protecting valuable assets. Key features and benefits of the Littelfuse SE-325ESNT include: * **Precise Ground-Fault Detection:** Adjustable trip levels (0.5–4.0 A) ensure accurate and tailored protection. * **Reliable Operation:** Designed for demanding industrial environments, ensuring consistent performance. * **System Integrity:** Protects sensitive equipment and prevents cascading failures. * **Enhanced Safety:** Contributes to a safer working environment by mitigating electrical hazards. * **Manufacturer Trust:** Backed by Littelfuse's extensive experience and reputation in electrical protection solutions. Applications for the SE-325ESNT are diverse and include motor control centers, industrial machinery, power generation facilities, substations, and any electrical system where reliable neutral grounding is critical. Its integration into existing electrical panels and control systems is straightforward, allowing for seamless implementation by qualified electricians and engineers. The SE-325ESNT is an investment in the longevity and safety of your electrical infrastructure, providing peace of mind through its dependable performance and advanced monitoring capabilities. For robust and reliable ground-fault protection, the Littelfuse SE-325ESNT is a superior choice.
  • Littelfuse SE-325ESNT Neutral Grounding Resistor Monitor
  • 240 VAC Supply Voltage
  • Adjustable Ground-Fault Trip Level: 0.5 to 4.0 Amperes
  • Essential for Industrial Power System Safety and Reliability
  • Trusted Littelfuse Quality and Performance

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
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.