Description
Detailed parameter table
| Parameter name | Parameter value |
| Product model | D674A905U01 |
| Manufacturer | ABB |
| Product category | Industrial Safety Relay Module |
| Operating voltage | 24 VDC ±10% |
| Power consumption | 3 W typical, 5 W maximum |
| Safety integrity level | SIL 2 (per IEC 61508); PL d (per ISO 13849-1) |
| Input channels | 2 safety inputs (ESPE, ESD) |
| Output contacts | 2 x NO (Normally Open) safety contacts, 1 x NC (Normally Closed) auxiliary contact |
| Contact rating | 6 A @ 250 VAC; 6 A @ 30 VDC resistive load |
| Response time | <10 ms for safety function activation |
| Operating temperature | -20°C to +60°C (-4°F to +140°F) |
| Humidity tolerance | 5% to 95% RH (non-condensing) |
| Installation method | DIN rail mount (35mm) |
| Dimensions | 90mm × 60mm × 65mm (3.54″ × 2.36″ × 2.56″) |
| Certifications | CE, UL, CUL, ATEX, IECEx, RoHS, TÜV certified |
| MTBF | >400,000 hours |
ABB D674A905U01
Product introduction
The ABB D674A905U01 is a compact yet robust industrial safety relay module designed to provide reliable monitoring and control of basic safety functions in machinery and process automation. As a key component in ABB’s safety product portfolio, this module serves as a cost-effective solution for implementing essential safety interlocks, emergency stop circuits, and protective monitoring in applications where high-integrity safety control is required but complex logic isn’t necessary.
ABB D674A905U01 functions as a dedicated safety relay that monitors safety input signals and controls safety-related outputs based on predefined safety logic. Its streamlined design focuses on core safety functionality, making it easy to configure and deploy in applications ranging from small machinery to auxiliary systems in larger industrial plants. Unlike programmable safety controllers, this module offers fixed safety logic that meets international safety standards without requiring complex programming.
In industrial safety architectures, ABB D674A905U01 plays an important role in providing foundational safety protection for equipment where simplified safety solutions are preferred. By offering certified safety performance in a compact form factor, this module helps ensure compliance with safety regulations while minimizing installation space and costs, making it an ideal choice for both new installations and safety upgrades of existing machinery.
Core advantages and technical highlights
Certified safety performance: ABB D674A905U01 achieves SIL 2 certification per IEC 61508 and PL d per ISO 13849-1, ensuring reliable performance in medium-risk safety applications. The module incorporates built-in self-monitoring features that continuously check internal circuits and contact integrity, providing immediate fault detection. This diagnostic capability ensures that potential failures are identified before they can compromise safety functions, maintaining high availability of the safety system with minimal maintenance requirements.
Simplified installation and configuration: The module features a user-friendly design that simplifies installation and setup compared to complex safety controllers. ABB D674A905U01 requires no programming, using fixed safety logic that supports standard safety functions like emergency stop monitoring and safety gate interlocking. Clear labeling of input/output terminals and status indicators facilitate quick wiring and troubleshooting, reducing installation time and minimizing the risk of configuration errors.
Robust contact design: ABB D674A905U01 incorporates high-quality safety contacts rated for 6 A at 250 VAC, providing reliable switching capability for control of contactors, valves, and other safety-related actuators. The module’s contacts are designed for high durability, supporting a high number of switching cycles to ensure long service life in continuous industrial operation. Separate safety and auxiliary contacts allow for independent monitoring of safety status without compromising safety functionality.
Compact and rugged construction: With dimensions of just 90mm × 60mm × 65mm, ABB D674A905U01 occupies minimal space in control cabinets, making it suitable for applications with space constraints. The module’s rugged design ensures reliable operation across an extended temperature range (-20°C to +60°C) and provides immunity to electromagnetic interference common in industrial environments. Its DIN rail mounting design allows for secure installation and easy integration with other control components.
Typical application scenarios
In small to medium manufacturing machinery, such as packaging equipment and material handling systems, ABB D674A905U01 provides essential safety protection by monitoring emergency stop buttons and safety interlock switches on machine guards. When a safety condition is detected, the module immediately de-energizes its safety outputs to stop hazardous motion, preventing access to dangerous machine parts. Its compact size makes it ideal for integration into space-constrained machinery control panels, while its simplified design reduces commissioning time for original equipment manufacturers (OEMs).
Food processing lines utilize ABB D674A905U01 to monitor safety interlocks on access doors for mixers, conveyors, and processing equipment. The module connects to safety sensors that detect door position, ensuring that equipment cannot operate when access doors are open. In washdown environments, the module’s robust construction withstands the harsh conditions of food processing facilities, while its reliable contact design ensures consistent performance despite temperature fluctuations and vibration common in these applications.
Warehouse automation systems deploy ABB D674A905U01 to provide safety protection for automated storage and retrieval systems, conveyor transfers, and robotic picking stations. The module monitors safety light curtains and emergency stop stations along material handling paths, activating safety outputs to stop equipment when personnel enter hazardous areas. Its quick response time (<10 ms) ensures timely activation of safety functions, while its low power consumption makes it suitable for battery-backed or energy-efficient systems.
ABB D674A905U01
Related model recommendations
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ABB CM572 3BSE013229R1: Communication module that allows ABB D674A905U01 integration with larger control systems.
ABB S800 I/O system: Distributed I/O platform that can work alongside ABB D674A905U01 for mixed standard and safety control.
Installation, commissioning and maintenance instructions
Installation preparation: Before installing ABB D674A905U01, verify the mounting location provides protection from excessive moisture, vibration, and extreme temperatures. Ensure the ambient temperature remains within the -20°C to +60°C operating range. Confirm the 24 VDC power supply delivers stable output with ripple voltage below 100mV and appropriate overcurrent protection. Use twisted-pair cables for all safety connections, with proper shielding and grounding to minimize electromagnetic interference. Mount the module on a clean 35mm DIN rail, ensuring adequate spacing from heat-generating components for proper cooling. Follow the terminal diagram to connect safety inputs and outputs, ensuring correct polarity for DC connections.
Maintenance suggestions: Perform quarterly visual inspections of ABB D674A905U01 to check for secure connections, dust accumulation, and signs of physical damage. Verify status indicators show normal operation during routine checks. Test all safety functions semi-annually by activating emergency stops and safety interlocks to confirm proper operation of input monitoring and output deactivation. Clean the module’s surface and ventilation openings as needed using a dry cloth, avoiding the use of solvents. Inspect wiring connections for tightness and signs of corrosion, particularly in humid environments. Replace the module immediately if any safety contacts show signs of excessive wear or if diagnostic indicators show persistent fault conditions.
Service and guarantee commitment
ABB provides ABB D674A905U01 with a comprehensive 36-month warranty covering manufacturing defects and ensuring compliance with published safety performance specifications under normal operating conditions. Our global technical support network offers expert assistance for installation, configuration, and troubleshooting, ensuring proper implementation of safety functions in accordance with applicable standards.
Customers receive access to ABB’s safety application resources, including wiring diagrams, safety function documentation, and compliance guides to support proper installation and operation. Beyond the warranty period, ABB offers technical support services to assist with maintenance, replacement, and system upgrades. ABB’s commitment to safety quality ensures that ABB D674A905U01 delivers reliable performance in essential safety applications, backed by our extensive experience in industrial safety solutions and commitment to protecting personnel and equipment.
