Littelfuse SE-703-0U - EARTH-LEAKAGE MONITOR - UNIVERSAL. The SE-703 is a microprocessor-based ground-fault relay for resistance- and solidly-earthed systems. It offers sensitive ground-fault detection as low as 25 mA and can be used on systems with significant harmonic content. The SE-703 provides feeder-level protection or individual-load protection. The output contacts can be connected for use in protective tripping circuits or in alarm indication circuits. The analog output can be used with a PLC or a meter. The SE-703 is specifically designed to be Australian AS/NZS 2081 compliant.
Littelfuse

SE-703-0U

UPC: 079458989113

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Overview

The Littelfuse SE-703-0U Earth-Leakage Monitor is a sophisticated, microprocessor-based ground-fault relay engineered for superior electrical safety in both resistance-earthed and solidly-earthed systems. This universal device offers highly sensitive ground-fault detection capabilities, capable of identifying leakage currents as low as 25 mA, ensuring prompt identification of potentially hazardous conditions before they escalate. Designed for demanding industrial and commercial environments, the SE-703-0U excels in applications where harmonic content can be significant. Its advanced design mitigates false tripping due to harmonics, providing reliable and stable protection. This makes it an ideal solution for a wide range of electrical distribution systems, including those found in manufacturing plants, data centers, hospitals, and commercial buildings. The versatility of the SE-703-0U allows for flexible deployment. It can be utilized for comprehensive feeder-level protection, safeguarding entire circuits, or for individual-load protection, offering granular control and enhanced safety for specific critical equipment. This adaptability ensures that the monitor can be tailored to meet the unique protection requirements of any installation. Key operational features include configurable output contacts. These contacts can be easily wired for critical protective tripping circuits, ensuring immediate disconnection of power in the event of a ground fault, or for alarm indication circuits, alerting personnel to a developing issue without immediate system shutdown. This dual functionality enhances operational flexibility and safety management. Furthermore, the SE-703-0U is equipped with an analog output, providing seamless integration with Programmable Logic Controllers (PLCs) or monitoring meters. This allows for real-time data acquisition, remote monitoring, and integration into broader SCADA or building management systems, enabling advanced diagnostics and predictive maintenance strategies. A significant advantage of the SE-703-0U is its specific design to meet and exceed the stringent requirements of Australian AS/NZS 2081 compliance. This certification underscores the product's commitment to safety, reliability, and performance standards crucial for electrical installations in Australia and New Zealand. Professionals can trust this device to deliver robust protection that adheres to local regulatory demands. Littelfuse, a globally recognized leader in circuit protection, brings its extensive expertise and commitment to quality to the SE-703-0U. This ensures that users benefit from a product built with durable components and advanced technology, designed for long-term, reliable operation. Investing in the SE-703-0U means investing in enhanced electrical safety, reduced downtime, and compliance with critical safety standards. Key Features and Benefits: * **Sensitive Ground-Fault Detection:** Detects leakage currents as low as 25 mA for early fault identification. * **Harmonic Content Tolerance:** Operates reliably in systems with significant harmonic distortion. * **Flexible Application:** Suitable for feeder-level or individual-load protection. * **Configurable Outputs:** Output contacts for protective tripping or alarm indication. * **Analog Output:** For integration with PLCs and meters. * **AS/NZS 2081 Compliant:** Meets critical Australian and New Zealand safety standards. * **Microprocessor-Based:** Advanced control and monitoring capabilities. * **Trusted Manufacturer:** From Littelfuse, a leader in circuit protection.
  • Microprocessor-based ground-fault relay for resistance- and solidly-earthed systems.
  • Sensitive ground-fault detection as low as 25 mA.
  • Suitable for systems with significant harmonic content.
  • Provides feeder-level or individual-load protection.
  • AS/NZS 2081 compliant for Australian and New Zealand markets.

Specifications

Application
NA
Brand Name
Littelfuse
Series
SE-703
Special Features
Adjustable Time Delay
Standard
Australian AS/NZS 2081 compliant
Sub Brand
SE 703 Series
Type
Ground Fault Relays
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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.