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Phone：+86 15383419322Description
The Phoenix Contact QUINT-DIODE/40 2938963 is a high-performance redundancy module engineered to maximize the availability of 24 V DC power supplies in critical automation environments. Designed as a core component of the QUINT product family, this device allows two power sources—typically two identical switched-mode power supply units—to be decoupled and operated in parallel. By utilizing highly efficient diode technology, the QUINT-DIODE/40 2938963 ensures that if one power supply fails or experiences a voltage drop, the second unit continues to power the load without interruption. This “hot standby” capability is essential for preventing costly downtime in process control systems where even a momentary loss of logic power can trigger a full system shutdown.Beyond simple redundancy, the Phoenix Contact 2938963 acts as a safeguard against reverse currents. In standard parallel configurations without decoupling, a short circuit in one power supply could drain the reserve of the healthy unit; this module prevents that backflow, isolating the fault. The unit is rated for a total output current of 40 A, which can be achieved by combining two 20 A inputs or utilizing a single 40 A input for load sharing applications. Its compact metal housing ensures effective heat dissipation, keeping the temperature rise minimal even under full load. For system integrators working with safety instrumented systems (SIS) or high-availability PLC racks, the QUINT-DIODE/40 2938963 provides a cost-effective, hardware-based layer of insurance that is far more reliable than software-based switching solutions.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | QUINT-DIODE/40 (2938963) |
| Manufacturer | Phoenix Contact |
| Product Type | Redundancy Module / Decoupling Module |
| Rated Input Voltage | 24 V DC (Range: 0 V … 30 V DC) |
| Rated Output Current | 40 A (Total) |
| Input Configuration | 2x 20 A or 1x 40 A |
| Efficiency | > 97% |
| Power Loss (at Rated Load) | Max. 20 W |
| Connection Method | Screw Connection (0.5 mm² … 16 mm²) |
| Dimensions (W x H x D) | 62 mm x 84 mm x 102 mm |
| Operating Temperature | -25°C … +70°C (Derating > 60°C) |
| Protection Class | IP20 (DIN Rail Mount) |
| Certifications | UL 508, UL 60950-1, ATEX, DNV GL |
Main Features and Advantages
High Efficiency and Thermal Management: One of the most critical aspects of installing components inside a control cabinet is heat generation. The Phoenix Contact QUINT-DIODE/40 2938963 boasts an efficiency rating of greater than 97%. This means that very little energy is wasted as heat during the rectification process. The module features a specialized metal housing—specifically an AlMg cover and a die-cast zinc cooling unit—that acts as a heatsink. This design allows the 2938963 to handle high current loads (up to 40 A) without requiring active cooling fans or excessive derating, even when ambient temperatures rise to 60°C.Flexible Redundancy Architectures: The QUINT-DIODE/40 2938963 offers versatile wiring options to suit different reliability requirements. It can be configured for true redundancy using two 20 A power supplies, ensuring that the system remains online if one supply fails completely. Alternatively, it can be used to couple two 40 A supplies to increase the total available power capacity for heavy loads. The internal Transil diodes provide transient overvoltage protection, clamping voltage spikes that could otherwise damage sensitive downstream electronics. This flexibility makes the Phoenix Contact 2938963 a universal solution for both expanding system capacity and hardening existing infrastructure against failure.Safety and Isolation Standards: Safety is not an afterthought in the design of this module. The QUINT-DIODE/40 2938963 complies with EN 60950-1 (SELV) and EN 50178 (PELV) standards, ensuring electrical safety for personnel and equipment. It provides galvanic isolation between the input and output circuits (1 kV test voltage), which effectively breaks ground loops and prevents interference from propagating through the power lines. Furthermore, the module carries ATEX certification (II 3 G Ex nA IIC T4 Gc), making it suitable for use in Zone 2 hazardous areas where explosive gas atmospheres may occasionally occur.
Application Field
Process Control and Distributed Control Systems (DCS): In large-scale manufacturing plants, such as oil refineries or chemical processing facilities, the control system is the brain of the operation. A power failure here can lead to dangerous uncontrolled reactions. The Phoenix Contact QUINT-DIODE/40 2938963 is frequently installed at the input stage of DCS controller racks and marshalling cabinets. By decoupling dual redundant power feeds, it guarantees that the controllers remain active and communication is maintained, allowing for a controlled process state even during utility power fluctuations.Turbine and Compressor Control: Critical rotating machinery often utilizes Triple Modular Redundant (TMR) control systems, such as those from Triconex or Honeywell. These systems require three distinct, isolated 24 V DC supplies to function correctly. The QUINT-DIODE/40 2938963 serves as the interface between the external power sources and the TMR rack. It ensures that a fault in the external cabling or a specific power supply does not drag down the voltage rail, protecting the expensive processor modules and ensuring the emergency shutdown logic remains ready to trip if necessary.Telecommunications and Data Centers: While often associated with IT, the physical infrastructure of data centers relies on industrial automation for cooling and backup power management. The Phoenix Contact 2938963 is used to buffer battery banks and rectifier outputs. In these scenarios, the low voltage drop across the diode module is crucial, as it maximizes the usable voltage delivered to the load, extending the runtime of uninterruptible power supply (UPS) systems during outages.
Related Products
- QUINT-PS/1AC/24DC/40: A 40 A switched-mode power supply that pairs perfectly with the QUINT-DIODE/40 to create a complete redundant power system.
- QUINT-BUFFER/24DC/20: A buffer module that provides ride-through capability during brief power dips, often used in conjunction with redundancy modules for maximum uptime.
- QUINT-DC-UPS/24DC/40: An electronic breaker and UPS manager that communicates with QUINT power supplies to prioritize loads during a battery backup situation.
- QUINT-ORB/24DC/3X10/1X40: An ORing module similar to the 2938963 but designed for higher channel counts or different current ratings within the same QUINT ecosystem.
- TRIO-PS/1AC/24DC/20: A cost-effective alternative power supply series, though typically paired with simpler decoupling diodes for non-critical loads.
- MACX MCR-EX-SL-UI-UP-SP: A signal conditioning module often found in the same cabinet, handling analog signals while the QUINT-DIODE/40 manages the power integrity.
Installation and Maintenance
Pre-installation preparation: Before mounting the Phoenix Contact QUINT-DIODE/40 2938963, ensure that the DIN rail (NS 35/7.5 or NS 35/15) is securely fastened and grounded. Verify that the two power supplies you intend to connect are set to the exact same output voltage; a significant mismatch can cause one supply to carry the entire load or trigger current limiting issues. Ensure there is adequate ventilation around the module; while it is highly efficient, it still dissipates up to 20 W of heat at full load. Leave at least 20 mm of clearance horizontally and 50 mm vertically to allow for proper airflow and heat dissipation from the metal housing.Maintenance recommendations: During routine maintenance intervals, inspect the screw terminals of the QUINT-DIODE/40 2938963 for tightness, as thermal cycling can cause connections to loosen over time. Use a torque screwdriver to verify that the terminals are tightened to the specified value (typically around 0.5-0.6 Nm for M4 threads). Check the LED indicators on the connected power supplies to ensure both are active and sharing the load. If the module has been subjected to a known surge event or lightning strike, test the continuity and forward voltage drop of the internal diodes, as transient suppressors can degrade after absorbing high-energy spikes.
