Littelfuse SE-325ST - SE-325ST 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-325ST

Alternate Item Number: SE-325ST

UPC: 079458988307

Documents & Media
BrochureTechnical BulletinTechnical DrawingSpecification SheetUser Manual

Contact for Pricing

Overview

The Littelfuse SE-325ST Neutral Grounding Resistor Monitor is a critical component for maintaining the integrity and safety of industrial electrical distribution systems. Designed to provide reliable detection of ground faults, this monitor plays a vital role in preventing equipment damage, minimizing downtime, and ensuring personnel safety. With a robust 120V AC supply voltage, the SE-325ST is engineered to integrate seamlessly into a wide array of industrial power configurations. At its core, the SE-325ST functions by continuously monitoring the resistance of the neutral grounding resistor. This resistor is essential for limiting the magnitude of transient overvoltages and controlling fault current during a ground fault event. By precisely measuring the current flowing through this resistor, the SE-325ST can accurately identify when a ground fault exceeds a predetermined threshold. This proactive detection capability is paramount in preventing cascading failures and protecting sensitive electrical equipment from the destructive effects of sustained ground faults. The SE-325ST offers a highly adjustable ground-fault trip level, ranging from a sensitive 0.5 Amperes up to 4.0 Amperes. This flexibility allows engineers and maintenance personnel to fine-tune the monitor's sensitivity to match the specific requirements of their electrical system and the types of equipment being protected. A lower trip level provides earlier detection of smaller ground faults, which can be crucial for preventing minor issues from escalating into major problems. Conversely, a higher trip level might be appropriate in systems where transient currents are more common or where a certain level of fault current is permissible for a short duration. Key features and benefits of the Littelfuse SE-325ST include: * **Precise Ground Fault Detection:** Accurately identifies ground faults within the adjustable 0.5–4.0 A range. * **Reliable 120V AC Operation:** Designed for compatibility with standard industrial power supplies. * **Enhanced System Protection:** Helps prevent equipment damage and costly downtime. * **Adjustable Trip Sensitivity:** Allows for customization to specific system needs. * **Durable Industrial Construction:** Built to withstand harsh operating environments. * **Manufacturer Trust:** Littelfuse is a globally recognized leader in circuit protection and power control solutions, known for its commitment to quality and innovation. Applications for the SE-325ST are extensive across various industrial sectors, including manufacturing plants, chemical processing facilities, data centers, hospitals, and any environment utilizing grounded electrical systems. Its ability to detect ground faults early is critical in preventing arc flashes, fires, and damage to motors, transformers, and control systems. Proper installation and configuration of the SE-325ST, in conjunction with the neutral grounding resistor, are essential steps in establishing a robust and safe electrical infrastructure. By investing in the Littelfuse SE-325ST, industrial facilities can significantly enhance their operational reliability and safety protocols, ensuring continuous power delivery and protecting valuable assets.
  • Littelfuse SE-325ST Neutral Grounding Resistor Monitor
  • 120V AC Supply Voltage
  • Adjustable Ground-Fault Trip Level: 0.5 A to 4.0 A
  • Designed for Industrial Ground Fault Detection
  • Enhances Electrical System Safety and Reliability

Specifications

Application
Mining
Brand Name
Littelfuse
Current Rating
0.5–4.0 A
Series
SE
Special Features
Continuous NGR monitoring
Sub Brand
SE 325 Series
Type
Trailing Cable Protection
Voltage Rating
120V AC
Package Weight (Imperial)
1.980 L
Package Weight (Metric)
0.900 kg
Relay Accessories, Sockets & Clips, Printed Circuit Board, Phenolic, Printed Circuit Board, 6, Socket, Potter & Brumfield R10

1-1393143-3

Relay Accessories, Sockets & Clips, Printed Circuit Board, Phenolic, Printed Circuit Board, 6, Socket, Potter & Brumfield R10
Relay Accessories, Sockets & Clips, Solder, Polyester, Printed Circuit Board, 2, Socket, Potter & Brumfield R10

1-1393143-6

Relay Accessories, Sockets & Clips, Solder, Polyester, Printed Circuit Board, 2, Socket, Potter & Brumfield R10
RTXP 18

RK926011-BC

RTXP 18
RTXD Extractor Tool

6896057-1

RTXD Extractor Tool
Power supply for DIN-rail

PS-60

Power supply for DIN-rail
IP67 SCP-X Extreme Environment Series Power Supply. Double Stacked, Output Power 2 x 100W, Output Voltage 24 Vdc, Output Current 7.6 A total, 3.8 A per pair

SCP102D24X-C02

IP67 SCP-X Extreme Environment Series Power Supply. Double Stacked, Output Power 2 x 100W, Output Voltage 24 Vdc, Output Current 7.6 A total, 3.8 A per pair

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.