Littelfuse SE-325 - SE-325 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-325

Alternate Item Number: SE-325

UPC: 079458988079


Documents & Media
BrochureTechnical BulletinTechnical DrawingSpecification SheetUser Manual

Contact for Pricing

Overview

The Littelfuse SE-325 Neutral Grounding Resistor Monitor is a critical component for ensuring the safety and reliability of electrical systems in demanding industrial environments. Designed for precise and timely detection of ground faults, this monitor plays a vital role in preventing equipment damage, minimizing downtime, and enhancing personnel safety. With a robust design and advanced monitoring capabilities, the SE-325 is engineered to meet the stringent requirements of modern power distribution and industrial automation. At its core, the SE-325 operates by continuously monitoring the integrity of the neutral grounding resistor. A properly functioning grounding system is paramount for limiting transient overvoltages and providing a path for fault currents, thereby protecting sensitive equipment from surges and ensuring that protective devices operate correctly. When a ground fault occurs, it can compromise the entire system's stability and lead to cascading failures. The SE-325 is specifically designed to identify these deviations from normal operation. Key features of the Littelfuse SE-325 include its reliable 120 VAC supply voltage, ensuring compatibility with a wide range of standard industrial power sources. Furthermore, its adjustable ground-fault trip level, configurable from 0.5 to 4.0 Amperes, allows for precise tuning to the specific needs of the protected system. This adjustability is crucial for optimizing sensitivity while preventing nuisance tripping due to minor, transient current fluctuations. Such precise control is essential for differentiating between normal operating conditions and genuine fault events. Applications for the SE-325 are extensive, spanning various sectors where reliable power is non-negotiable. It is ideally suited for use in: * **Power Distribution Systems:** Protecting transformers, generators, and switchgear in substations and industrial facilities. * **Industrial Machinery:** Safeguarding motors, control panels, and complex automated equipment from ground faults that could lead to catastrophic failure. * **Data Centers and Critical Infrastructure:** Ensuring uninterrupted power and protecting sensitive electronic equipment. * **Manufacturing Plants:** Maintaining operational continuity and safety in environments with high electrical loads. The Littelfuse brand is synonymous with quality and dependability in the electrical protection industry. Their commitment to rigorous testing and high manufacturing standards ensures that products like the SE-325 deliver consistent performance and long-term reliability. By investing in a Littelfuse SE-325, facility managers and electrical engineers can gain peace of mind, knowing their critical electrical assets are protected by a proven and trusted solution. Prompt detection and alerting of ground faults by the SE-325 are fundamental to proactive maintenance strategies and the overall resilience of any industrial electrical infrastructure. This monitor is not just a component; it's an integral part of a comprehensive safety and operational integrity strategy.
  • Littelfuse SE-325 Neutral Grounding Resistor Monitor
  • 120 VAC Supply Voltage
  • Adjustable Ground-Fault Trip Level: 0.5–4.0 A
  • Enhances Electrical System Safety and Reliability
  • Ideal for Industrial Power Distribution and Machinery Protection

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
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
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.