Littelfuse SE-GRM780 - Connects the SE-601 relay to an ungrounded 24 Vdc bus.
Littelfuse

SE-GRM780

Alternate Item Number: SE-GRM780

UPC: 079458989397


Documents & Media
BrochureSpecification Sheet

Contact for Pricing

Overview

The Littelfuse SE-GRM780 relay adapter is a precision-engineered solution designed to bridge the SE-601 relay with an ungrounded 24 Vdc bus, ensuring seamless signal transmission and system compatibility in demanding industrial environments. As a critical component in automation, process control, and machinery integration, this adapter eliminates compatibility barriers while maintaining robust performance under harsh operating conditions. Engineered by Littelfuse—a global leader in circuit protection and industrial control solutions—the SE-GRM780 delivers the reliability and durability required for mission-critical applications where downtime is not an option. In industrial control systems, relay adapters like the SE-GRM780 play a pivotal role in signal conditioning and isolation, particularly when interfacing legacy or specialized relays with modern power distribution architectures. The ungrounded 24 Vdc bus configuration is common in process industries, including chemical processing, oil and gas, and water treatment, where electrical noise, transient spikes, and ground loop interference can compromise system integrity. The SE-GRM780 mitigates these risks by providing galvanic isolation, ensuring stable operation even in electrically noisy environments. Its compact form factor and DIN-rail mounting compatibility make it ideal for space-constrained control panels, while its high-quality terminal blocks ensure secure, vibration-resistant connections. Professionals in automation engineering, panel building, and industrial maintenance rely on Littelfuse products for their proven track record in reliability and compliance with international safety standards. The SE-GRM780 is no exception—designed to meet IEC 61000-4 for electromagnetic compatibility and UL 508 for industrial control equipment, it provides peace of mind in applications ranging from motor control centers to PLC-based automation systems. Installation is straightforward, with clear labeling and color-coded terminals reducing the risk of miswiring, a common source of system failures. For engineers specifying components for new installations or retrofits, the SE-GRM780 offers a cost-effective, plug-and-play solution that reduces design complexity without sacrificing performance. Beyond its technical specifications, the SE-GRM780 exemplifies Littelfuse’s commitment to innovation in industrial safety and control. The company’s extensive portfolio spans over a century of expertise, with products deployed in sectors as diverse as renewable energy, transportation, and manufacturing. When reliability, precision, and compliance are non-negotiable, the SE-GRM780 stands out as a trusted choice for professionals who demand the best in industrial relay interfacing. Whether upgrading an existing system or designing a new one, this adapter ensures that the SE-601 relay operates with the precision and stability required for optimal system performance.
  • Galvanic isolation for stable operation in noisy industrial environments
  • Compact DIN-rail mount design for space-efficient panel integration
  • High-quality terminal blocks for secure, vibration-resistant connections
  • Compliant with IEC 61000-4 and UL 508 safety standards
  • Plug-and-play solution for seamless SE-601 relay interfacing

Specifications

Application
Industrial
Brand Name
Littelfuse
Connection Type
Terminal blocks
Mounting Type
DIN-Rail
Special Features
High Quality
Sub Brand
Relay Series
Type
Protection Relays and Controls
Voltage Rating
24 VDC
Relay Accessories, Sockets & Clips, Printed Circuit Board, Phenolic, Printed Circuit Board, 6, Socket, Potter & Brumfield R10

1-1393143-3

Relay Accessories, Sockets & Clips, Printed Circuit Board, Phenolic, Printed Circuit Board, 6, Socket, Potter & Brumfield R10
Relay Accessories, Sockets & Clips, Solder, Polyester, Printed Circuit Board, 2, Socket, Potter & Brumfield R10

1-1393143-6

Relay Accessories, Sockets & Clips, Solder, Polyester, Printed Circuit Board, 2, Socket, Potter & Brumfield R10
RTXD Extractor Tool

6896057-1

RTXD Extractor Tool
Power supply for DIN-rail

PS-60

Power supply for DIN-rail
IP67 SCP-X Extreme Environment Series Power Supply. Double Stacked, Output Power 2 x 100W, Output Voltage 24 Vdc, Output Current 7.6 A total, 3.8 A per pair

SCP102D24X-C02

IP67 SCP-X Extreme Environment Series Power Supply. Double Stacked, Output Power 2 x 100W, Output Voltage 24 Vdc, Output Current 7.6 A total, 3.8 A per pair

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.