Littelfuse SE-325P - SE-325P 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-325P

Alternate Item Number: SE-325P

UPC: 079458988260

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Overview

The Littelfuse SE-325P Neutral Grounding Resistor Monitor is a critical component for ensuring the safe and reliable operation of industrial electrical systems. Designed to detect and alert to ground faults within a neutral grounding resistor circuit, this monitor plays a vital role in preventing equipment damage, minimizing downtime, and enhancing personnel safety. With a robust design and precise calibration, the SE-325P is engineered to withstand the demanding conditions typically found in industrial environments. At its core, the SE-325P functions by continuously monitoring the resistance of the neutral grounding path. A ground fault occurs when an unintended conductive path is established between a phase conductor and ground. In systems utilizing neutral grounding resistors, these resistors are designed to limit the magnitude of ground fault current, thereby preventing catastrophic damage to equipment and reducing the risk of arc flash incidents. The SE-325P's primary function is to detect when the integrity of this grounding path is compromised, often indicated by an abnormal current flow through the grounding resistor. This early detection allows for prompt corrective action before a minor fault escalates into a major system failure. Key specifications of the Littelfuse SE-325P include a supply voltage of 120 VAC, making it compatible with a wide range of standard industrial power supplies. Furthermore, its adjustable ground-fault trip level, ranging from 0.5 to 4.0 Amperes, provides flexibility in tailoring the protection to the specific requirements of different electrical systems. This adjustable threshold ensures that the monitor is sensitive enough to detect even small ground faults while minimizing nuisance tripping caused by normal system fluctuations. The ability to precisely set the trip level is crucial for optimizing protection and preventing unnecessary shutdowns. Applications for the SE-325P are extensive across various industrial sectors. It is commonly employed in: * **Power Distribution Systems:** Protecting transformers, generators, and switchgear in manufacturing plants, data centers, and utility substations. * **Motor Control Centers (MCCs):** Safeguarding large industrial motors and their associated control circuits. * **Process Industries:** Ensuring the continuous operation of critical equipment in chemical plants, refineries, and food processing facilities. * **Renewable Energy Installations:** Monitoring grounding integrity in solar farms and wind turbine systems. By integrating the Littelfuse SE-325P into your electrical infrastructure, you gain a proactive approach to ground-fault management. This leads to significant benefits, including: * **Reduced Downtime:** Prompt detection of ground faults prevents cascading failures and costly production interruptions. * **Enhanced Safety:** Minimizes the risk of electrical shock and arc flash incidents, protecting personnel. * **Equipment Protection:** Prevents damage to sensitive and expensive electrical equipment from sustained ground faults. * **Improved System Reliability:** Contributes to overall system stability and consistent power delivery. Littelfuse is a globally recognized leader in circuit protection and power control solutions, renowned for its commitment to quality, innovation, and reliability. Their extensive experience in designing and manufacturing high-performance industrial components ensures that the SE-325P is a dependable choice for critical applications. When selecting a neutral-grounding resistor monitor, the SE-325P from Littelfuse offers a compelling combination of advanced features, precise adjustability, and proven performance, making it an indispensable tool for maintaining the integrity and safety of your industrial electrical systems.
  • Monitors neutral grounding resistor integrity for reliable ground fault detection.
  • Adjustable ground-fault trip level from 0.5 to 4.0 Amperes for precise system tuning.
  • 120 VAC supply voltage for broad industrial compatibility.
  • Enhances safety by detecting faults that could lead to arc flash or shock hazards.
  • Minimizes downtime and equipment damage by providing early warning of ground faults.

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.