Littelfuse SE-330HV-02-00 - NGR MONITOR HV PROFIBUS. The SE-330 is an advanced ground-fault and neutral-grounding-resistor monitoring relay. It measures neutral current, neutral-to-ground voltage, and neutral-to-ground resistance. It provides continuous monitoring of the neutral-to-ground path to verify that the neutral-grounding resistor (NGR) is intact. This is of utmost importance—an open NGR renders current-sensing ground-fault protection inoperative and could result in a false belief that the system is functioning properly. The SE-330 can be used with low- and medium-voltage transformers and generators with low- or high-resistance grounding used in processing, manufacturing, chemical, pulp and paper, petroleum, and water-treatment facilities. For high-voltage applications, use the SE-330HV. For applications that require conformance to Australian standard AS/NZS 2081.3:2002, see the SE-330AU. The SE-330 New Revision provides these additional features: 100 trip records with date and time stamp. A mini-USB interface to view measured values, configure settings and check event records using SE-MON330 v3.2 or later. An on-board microSD card (included) can be used for long term data logging and firmware upgrades. Ground-fault trip level is adjustable from 2 to 100percent in 10 discrete settings, and in 1percent increments when using the MEM setting and SE-MON330 v3.2 or later. Dual Ethernet ports are optionally available with support for fiber and RJ45 interfaces. IEC 61850 protocol is optionally available.
Littelfuse

SE-330HV-02-00

UPC: 079458988819

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Overview

The Littelfuse SE-330HV-02-00 is an advanced Neutral Grounding Resistor (NGR) Monitoring Relay specifically designed for high-voltage applications up to 72 kV. This relay provides critical continuous monitoring of the neutral-to-ground path, ensuring the integrity of the NGR. It measures neutral current, neutral-to-ground voltage, and neutral-to-ground resistance, capable of detecting both open and shorted NGR conditions with or without a ground fault present. This capability is paramount, as an open NGR renders standard current-sensing ground-fault protection inoperative, leading to a false sense of system security. A shorted NGR can result in higher-than-expected ground-fault current. The SE-330HV-02-00 is ideal for low- and medium-voltage transformers and generators utilizing low- or high-resistance grounding in demanding sectors such as processing, manufacturing, chemical, pulp and paper, petroleum, and water-treatment facilities. Key features of the SE-330HV-02-00 include robust ground-fault monitoring with sensitivity as low as 100 mA, utilizing Discrete-Fourier Transform (DFT) filtering to prevent false trips from harmonic noise generated by adjustable-speed drives. It offers pulsing ground-fault location capabilities by controlling a pulsing contactor, allowing for fast and easy fault identification without isolating feeders or interrupting loads. The unit supports Profibus communication and features 100 trip records with date and time stamps. For enhanced data management and configuration, it includes a mini-USB interface for use with SE-MON330 software (v3.2 or later) and an onboard microSD card for long-term data logging and firmware upgrades. The ground-fault trip level is adjustable from 2% to 100%, with 1% increments available via the MEM setting and software. Optional dual Ethernet ports (RJ45 and/or SC Fiber) and IEC 61850 protocol support are available for advanced network integration. The relay also features a unit-healthy output contact (Form A or B) and conformal coating for protection against corrosion and moisture. Power supply options include 120/240 V ac/dc or 48 Vdc.
  • Continuous NGR monitoring for open or shorted conditions up to 72 kV.
  • Detects ground faults as low as 100 mA with DFT filtering for harmonic noise immunity.
  • Pulsing ground-fault location capability for easy fault identification.
  • Profibus communication standard; optional Ethernet and IEC 61850 support.
  • 100 trip records with date/time stamp, mini-USB interface, and microSD for data logging.

Specifications

Application
Low- and medium-voltage transformers and generators
Brand Name
Littelfuse
Special Features
Continuous NGR monitoring
Sub Brand
SE 330 Series
Type
Neutral-grounding resistor monitor
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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.