Littelfuse SE-703-0D - EARTH LEAKAGE MONITOR - 24 VDC. 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-703-0D

UPC: 079458989090

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Overview

The **Littelfuse SE-703-0D** is a high-performance, microprocessor-based earth leakage monitor engineered for resistance- and solidly-earthed systems. Designed to meet the stringent requirements of **AS/NZS 2081**, this advanced relay delivers precise ground-fault detection with sensitivity as low as **25 mA**, ensuring reliable protection against hazardous leakage currents in industrial and commercial environments. Unlike conventional relays, the SE-703-0D excels in systems with significant harmonic distortion, making it an ideal solution for modern power distribution networks where non-linear loads are prevalent. **Key Features and Functionality:** The SE-703-0D is built for versatility, offering both **feeder-level protection** and **individual-load protection** to safeguard critical equipment and personnel. Its **configurable output contacts** can be wired for **protective tripping**—automatically disconnecting faulty circuits to prevent damage—or **alarm indication**, alerting operators to potential issues before they escalate. Additionally, the integrated **analog output** enables seamless integration with **PLCs, SCADA systems, or digital meters**, allowing for real-time monitoring and data logging in industrial automation setups. **Applications Across Industries:** This earth leakage monitor is particularly well-suited for applications where electrical safety and compliance are non-negotiable. In **manufacturing plants**, it protects sensitive machinery from ground faults that could lead to costly downtime or equipment failure. **Data centers** rely on the SE-703-0D to maintain uptime by detecting leakage currents in uninterruptible power supplies (UPS) and distribution panels. **Hospitals and healthcare facilities** use it to ensure patient safety in critical care environments, while **mining and oil & gas operations** deploy it to mitigate explosion risks in hazardous locations. **Why Choose Littelfuse?** Littelfuse is a globally recognized leader in circuit protection, with over a century of innovation in electrical safety solutions. The SE-703-0D reflects the company’s commitment to **precision, reliability, and compliance**, offering engineers and facility managers a trusted tool for safeguarding personnel and assets. Its **compact design**, **easy installation**, and **low maintenance requirements** make it a cost-effective choice for retrofitting existing systems or designing new installations. **Installation and Compatibility:** The SE-703-0D operates on **24 VDC**, making it compatible with a wide range of control systems and automation networks. Its **modular construction** allows for DIN rail mounting, simplifying integration into control panels. Professionals appreciate the relay’s **self-test functionality**, which ensures operational readiness and reduces the risk of undetected faults. For systems requiring **remote monitoring**, the analog output can be scaled to interface with third-party monitoring software, providing actionable insights into electrical health. **Compliance and Peace of Mind:** Meeting **AS/NZS 2081** standards, the SE-703-0D guarantees adherence to Australia’s rigorous electrical safety regulations. This compliance is critical for businesses operating in regulated industries, where non-compliance can result in legal liabilities or operational shutdowns. By choosing Littelfuse, you’re not just purchasing a relay—you’re investing in **proactive safety, regulatory compliance, and long-term reliability** for your electrical infrastructure.
  • Microprocessor-based ground-fault relay for resistance- and solidly-earthed systems
  • Sensitive detection as low as 25 mA, ideal for harmonic-rich environments
  • Configurable output contacts for tripping or alarm circuits
  • Analog output for PLC/SCADA/meter integration
  • AS/NZS 2081 compliant for Australian electrical safety standards

Specifications

Application
NA
Brand Name
Littelfuse
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.