Littelfuse EL731-04-00 - EL731-04-00 is an earth-leakage relay with a supply voltage ac of 120–240 and a supply voltage dc of 120–240. Communications is offered via Modbus®TCP.
Littelfuse

EL731-04-00

Alternate Item Number: EL731-04-00

UPC: 079458977783


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Overview

The Littelfuse EL731-04-00 is a microprocessor-based AC/DC Sensitive Earth-Leakage Relay designed for comprehensive ground-fault protection across a wide frequency range of 0 to 6,000 Hz. This relay is engineered to provide essential safety and operational integrity in industrial and commercial electrical systems. It operates with a versatile control power supply range of 120–240V AC or DC, ensuring compatibility with diverse power infrastructures. The EL731-04-00 features Modbus® TCP communication, enabling seamless integration into SCADA systems and industrial automation networks for remote monitoring, diagnostics, and data acquisition. Its functionality includes metering capabilities and password-protected alarm and trip settings, allowing for precise configuration and proactive maintenance. For enhanced protection, an RTD/PTC sensor input is available for over-temperature monitoring of motors or drives. The relay requires the use of one or two EFCT Series Earth-Fault Current Transformers (sold separately) for accurate zero-sequence current detection. Applications include adding low-level ground-fault protection to variable-speed drives and DC circuits. The EL731-04-00 is a critical component for safeguarding personnel and equipment from electrical hazards by detecting and mitigating earth-leakage currents effectively. Its robust design and advanced communication features make it a reliable choice for critical infrastructure, manufacturing facilities, and any application demanding robust ground-fault protection.
  • Microprocessor-based AC/DC Sensitive Earth-Leakage Relay
  • Frequency coverage from 0 to 6,000 Hz
  • 120–240V AC/DC control power supply
  • Modbus® TCP communication for network integration
  • RTD/PTC sensor input for over-temperature protection

Specifications

Application
NA
Brand Name
Littelfuse
Special Features
Adjustable pickup
Standard
UL, CSA, C-Tick
Sub Brand
EL731 Series
Type
Protection Relay
Voltage Rating
120-240 VAC/DC
Package Dimensions (L x W x H)
5 IN x 3.8 IN x 1.9 IN
Package Dimensions (L x W x H)
12.7 cm x 9.652 cm x 4.826 cm
Package Weight (Imperial)
1.100 L
Package Weight (Metric)
0.500 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.