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QUINT-DIODE/40 (2938963) is a 24VDC diode redundancy module manufactured by Phoenix Contact. It is designed for parallel redundancy of two 20A power supplies or capacity expansion for a single 40A circuit. This model is discontinued. The official replacement is QUINT4-DIODE/12-24DC/2X20/1X40 (2907719). It features reverse polarity protection, low voltage drop (0.5V) and efficiency over 97%, ideal for critical systems such as industrial automation and process control.
- Model Code Explanation
| Model Segment | Description |
| QUINT | Product line identifier for Phoenix QUINT POWER power supplies |
| DIODE | Diode-type redundancy module (passive redundancy, no active current sharing) |
| 40 | Maximum output current: 40A (supports 2×20A redundant input) |
| Order No. | 2938963 (Unique factory part number) |
| Upgrade Replacement | QUINT4-DIODE/12-24DC/2X20/1X40 (Order No.: 2907719) |
- Core Technical Specifications
| Category | Specifications |
| Electrical Characteristics | |
| Input Voltage | 24VDC (Range: 0~30VDC) |
| Rated Input Current | 2×20A (Redundancy Mode) / 1×40A (Capacity Expansion Mode) |
| Max. Output Current | 40A (at 40°C, with 6mm² cable) |
| Voltage Drop | 0.5V (Input to Output) |
| Efficiency | >97% |
| Reverse Polarity Protection | Yes (<60V) |
| Transient Surge Protection | Transil Diode |
| Mechanical Characteristics | |
| Mounting Type | DIN rail mounting (NS 35, compliant with EN 60715) |
| Dimensions (W × H × D) | 62mm × 84mm × 102mm |
| Housing Material | Metal (AlMg enclosure, GD-ZnAlCu cooling unit) |
| Weight | 600g (without packaging), 683g (with packaging) |
| Environmental Characteristics | |
| Operating Temperature | -25°C ~ 70°C (Derating required above 60°C) |
| Storage Temperature | -40°C ~ 85°C |
| Ingress Protection | IP20 (For installation inside enclosed control cabinets only) |
| Protection Class | Class II (Double insulation) |
| Certifications & Reliability | |
| MTBF (@40°C) | 28,571,428 hours (approx. 3260 years) |
| Marine Certifications | DNV GL (EMC A), ABS |
| UL Certification | UL/C-UL Listed (UL 508, UL 1604 Class I, Division 2) |
| ATEX Certification | II 3G Ex nA IIC T4 Gc |
| HS Code | 85049090 |
- Cross-Brand & Old/New Model Replacement List
3.1 Original Manufacturer Replacements
| Old Model | Status | Replacement Model | Order No. | Major Improvements |
| QUINT-DIODE/40 | Discontinued | QUINT4-DIODE/12-24DC/2X20/1X40 | 2907719 | Extended operating temperature: -40°C~60°C; 12-24VDC wide voltage range; optimized heat dissipation |
| QUINT-DIODE/12-24DC/2X20/1X40 | Active | QUINT4-DIODE/12-24DC/2X20/1X40 | 2907719 | In-series upgrade with enhanced performance |
| QUINT-DIODE/48DC/2X20/1X40 | Active | QUINT4-DIODE/48DC/2X20/1X40 | 2907720 | Upgrade for 48VDC version |
3.2 Cross-Brand Compatible Replacements
| Brand | Model | Rated Current | Voltage Range | Features |
| Weidmüller | UR 24DC/2×20/1×40 | 40A | 24VDC | Diode redundancy, DIN rail mount |
| WAGO | 289-602 | 40A | 24VDC | Compact design, low power consumption |
| Würth | WE-DD-40 | 40A | 24VDC | High reliability, industrial certifications |
| R. STAHL | Series 8579 | 40A | 24VDC | Explosion-proof certified for hazardous areas |
- Full Product Line List
4.1 QUINT-DIODE Series (Classic Models)
| Model | Order No. | Voltage Rating | Current Rating | Features |
| QUINT-DIODE/40 | 2938963 | 24VDC | 2×20A / 1×40A | Basic model, discontinued |
| QUINT-DIODE/12-24DC/2X20/1X40 | 2320157 | 12-24VDC | 2×20A / 1×40A | Wide voltage range, commonly used |
| QUINT-DIODE/48DC/2X20/1X40 | 2320160 | 48VDC | 2×20A / 1×40A | Dedicated for 48VDC systems |
| QUINT-DIODE/48DC/40 | 2866585 | 48VDC | 40A | Protective coating, suitable for harsh environments |
4.2 QUINT4-DIODE Series (Upgraded Models)
| Model | Order No. | Voltage Rating | Current Rating | Features |
| QUINT4-DIODE/12-24DC/2X20/1X40 | 2907719 | 12-24VDC | 2×20A / 1×40A | Wide temperature design: -40°C~60°C |
| QUINT4-DIODE/48DC/2X20/1X40 | 2907720 | 48VDC | 2×20A / 1×40A | Upgrade for 48VDC systems |
4.3 QUINT-ORING Series (Active Redundancy with ACB Current Sharing)
| Model | Order No. | Voltage Rating | Current Rating | Features |
| QUINT-ORING/24DC/2X20/1X40 | 2320186 | 24VDC | 2×20A / 1×40A | Active current sharing, extended power supply service life |
| QUINT4-S-ORING/12-24DC/1X40 | 2907752 | 12-24VDC | 40A | Intelligent monitoring, compatible with QUINT4 power supplies |
- Application Environments & Industry Cases
5.1 Applicable & Non-Recommended Scenarios
| Applicable Scenarios | Non-Recommended Scenarios |
| Industrial automation control systems (PLC, DCS) | Long-term high-load systems requiring active current sharing (ORING series recommended) |
| Process control equipment (Petrochemical, Water treatment) | Unstable power supplies with voltage fluctuation over ±25% |
| Infrastructure (Communication base stations, Data centers) | Explosive hazardous areas (Select EX-certified models) |
| Marine & offshore engineering (Marine certifications available) | Unprotected outdoor installation (IP20 rating only) |
| Medical equipment (Compliant with SELV/PELV requirements) | Ambient temperature above 70°C (Derate load or use high-temperature models) |
5.2 Typical Application Cases
- Automobile Production Lines
Application: Two QUINT-PS/1AC/24DC/20 power supplies connected in parallel with QUINT-DIODE/40 for redundancy.
Value: Ensure continuous operation of welding robots and PLC systems, and reduce production downtime losses.
- Petrochemical Process Control
Application: Redundant power configuration for Safety Instrumented Systems (SIS).
Value: Compliant with IEC 61508, provides SIL 2 safety level and prevents safety accidents caused by power failure.
- Smart Grid Monitoring Systems
Application: Dual power redundancy for Remote Terminal Units (RTU).
Value: Maintain communication and data acquisition under extreme weather conditions to guarantee stable grid operation.
- Troubleshooting & Maintenance Manual
6.1 Common Faults, Causes & Solutions
| Fault Phenomenon | Possible Causes | Solutions |
| Abnormally low output voltage | 1. Excessive forward voltage drop of internal diodes | 1. Verify input voltage within 0~30VDC |
| 2. Insufficient input voltage | 2. Check and retighten terminals | |
| 3. Loose terminal connections | 3. Test internal diodes with multimeter diode mode | |
| Severe overheating | 1. Overloaded current | 1. Ensure load current does not exceed 40A (derate per cable specification) |
| 2. Poor heat dissipation | 2. Reserve sufficient clearance for heat dissipation (50mm top & bottom) | |
| 3. Excessively high ambient temperature | 3. Lower ambient temperature or add ventilation | |
| Failed parallel operation of power supplies | 1. Reverse wiring polarity | 1. Recheck wiring polarity |
| 2. Excessive voltage difference between two inputs | 2. Keep voltage difference between two power supplies within 1V | |
| 3. Open-circuit internal diode | 3. Replace the faulty module | |
| Malfunction of reverse current protection | 1. Damaged reverse polarity protection diode | 1. Limit input voltage below 30VDC |
| 2. Input voltage over 60V | 2. Replace internal protection diode | |
| 3. Install external surge suppressor |
6.2 On-site Quick Diagnosis Procedure
- Visual Inspection
Check housing for burn marks, deformation or discoloration.
Inspect terminals for looseness, oxidation and corrosion.
Remove dust accumulated on heat sinks which impairs heat dissipation.
- Electrical Testing
Measure input voltage to confirm it is within 0~30VDC.
Measure output voltage (normally input voltage minus 0.5V).
Test diode forward/reverse resistance: normal state is forward conduction and reverse cut-off.
- Function Verification
Disconnect one power supply and confirm the other works normally.
Restore dual power input and check uniform load distribution.
Measure temperature rise: shall not exceed ambient temperature +30°C.
- Selection Guidelines & Quick Reference Rules
- Three Key Selection Factors: Voltage class (24/48VDC), Current demand (≤40A), Redundancy mode (2×20A or 1×40A)
- Replacement Rule: QUINT-DIODE/40 is replaced by QUINT4-DIODE/12-24DC/2X20/1X40 (2907719), fully backward compatible.
- Current Derating Rules:
6mm² cable: 39A @ 40°C, 32A @ 60°C
10mm² cable: 54A @ 40°C, 43A @ 60°C
16mm² cable: 60A @ 40°C, 48A @ 60°C
- Installation Requirements: Horizontal or vertical DIN rail mounting; reserve 50mm clearance top and bottom for heat dissipation, 5mm clearance on left and right sides.
