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WDR-120-24 WDR 120 24 24V 120W Industrial Single Output DIN Rail Power Supply
Rp1,320,000.00
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DAPPRA WDR-120-24 (SKU: OF61) is a 120W single output ultra-wide input industrial DIN rail power supply with 24V DC / 5A output. Accepts 180–550 VAC single-phase or two-phase input (no neutral required), 91% typical efficiency at 400VAC, built-in DC OK relay contact, 3KVAC isolation, slim 40 mm metal housing, fanless cooling, TS35 DIN rail mounting — ideal for 380V/400V/480V industrial systems and two-phase networks.
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Overview
WDR-120-24 Overview
The DAPPRA WDR-120-24 (SKU: OF61) is a 120W single-output industrial DIN rail power supply in the WDR Series. It provides a stable 24V DC output at 5A rated current from an ultra-wide 180–550 VAC single-phase or two-phase input, or 254–780 VDC input, with 91% typical efficiency at 400VAC.
Designed for industrial power systems where conventional 90–264VAC supplies cannot be used, the WDR-120-24 accepts two phases of a 380V/400V/480V three-phase network without a neutral. It features a slim 40 mm metal housing, fanless natural convection cooling, a built-in DC OK relay contact, and complete protection functions including short circuit, overload (105–130% constant current limiting, auto-recovery) and over-voltage (29–33V, auto-recovery). The unit operates from −25°C to +70°C with derating above +50°C and mounts on TS35/7.5 or TS35/15 DIN rail.
Key Features
WDR-120-24 Key Features
Engineered for ultra-wide input 24V power in industrial systems without a neutral conductor.
- 120W Output · 24V / 5ASingle output providing 24V DC at 5A (0–5A range) with 120W rated power. Output adjustable 24–29V via +V ADJ.
- Ultra-Wide AC Input 180–550 VACSingle-phase and two-phase input. Also accepts 254–780 VDC. Suitable for 220V, 380V, 400V and 480V systems, and two-phase operation without a neutral.
- 91% Typical Efficiency at 400VACHigh efficiency reduces energy consumption and heat generation inside the control cabinet.
- Built-in DC OK Relay ContactDry relay contact on TB2 pins 1–2 for remote status monitoring or direct PLC input.
- 3KVAC I/O IsolationInput-to-output isolation suitable for most industrial control and automation applications.
- Complete Protection FunctionsShort circuit, overload (105–130% constant current limiting, auto-recovery) and over-voltage (29–33V, auto-recovery) protection.
- Slim 40 mm Metal HousingThe 40 × 125.2 × 113.5 mm metal housing saves DIN rail space while providing mechanical robustness.
- Fanless Natural Convection CoolingNo fan means no dust intake and no moving parts — ideal for dusty industrial environments.
- TS35 DIN Rail MountingDesigned for standard TS35/7.5 or TS35/15 DIN rail mounting. UL508 approved with 3-year warranty.
Specifications
WDR-120-24 Specifications
Complete technical specifications for the WDR-120-24 ultra-wide input DIN rail power supply.
Output
| DC Output Voltage | 24V |
| Rated Current | 5A |
| Current Range | 0–5A |
| Rated Power | 120W |
| Ripple & Noise (max.) | 120mVp-p |
| Voltage Adjustment Range | 24–29V |
| Voltage Tolerance | ±1.0% |
| Line Regulation | ±0.5% |
| Load Regulation | ±0.5% |
| Setup, Rise Time | 2000ms, 70ms, 50ms / 400VAC · 2000ms, 70ms, 10ms / 230VAC at full load |
Input
| Voltage Range | 180–550VAC · 254–780VDC |
| Frequency Range | 47–63Hz |
| Efficiency (Typ.) | 91% at 400VAC |
| AC Current (Typ.) | 0.7A / 400VAC · 1.2A / 230VAC |
| Inrush Current (Typ.) | Cold start 50A at 400VAC |
| Leakage Current | <3.5mA at 530VAC |
Protection
| Overload | 105–130% rated output power · Constant current limiting · Auto-recovery |
| Over Voltage | 29–33V · Shut down output, auto-recovery |
| Over Temperature | Shut down output; auto-recovery after temperature falls |
| Short Circuit | Protected |
Environment
| Working Temperature | −25 ~ +70°C (Derating above +50°C) |
| Working Humidity | 20–90% RH non-condensing |
| Storage Temp., Humidity | −40 ~ +85°C, 10–95% RH |
| Vibration | 10–500Hz, 2G 10min./1cycle, 60min. each along X, Y, Z axes |
Safety & EMC
| Safety Standards | UL508, EAC TP TC 004 |
| Withstand Voltage | I/P-O/P: 3KVAC · I/P-FG: 1.5KVAC · O/P-FG: 0.5KVAC |
| Isolation Resistance | >100M Ohms / 500VDC |
| EMC Emission | BS EN/EN55032 Class B |
| EMC Immunity | BS EN/EN61000-6-2 (BS EN/EN50082-2) heavy industry level |
Reliability & Dimensions
| MTBF | 1509.6K hrs min. Telcordia SR-332 · 268.1K hrs min. MIL-HDBK-217F (25°C) |
| Dimensions (W×H×D) | 40 × 125.2 × 113.5 mm |
| Weight | Approx. 0.65 kg |
| Warranty | 3 Years |
Front Panel & DC OK
| +V ADJ | Output voltage adjustment potentiometer (24–29V) |
| DC OK LED | DC output status indicator |
| DC OK Contact | Relay contact, max. 30V/1A resistive load |
| Contact Close | PSU turns on / DC OK |
| Contact Open | PSU turns off / DC Fail |
Notes
1. All parameters measured at 400VAC input, rated load and 25°C ambient unless noted. 2. Ripple & noise measured at 20MHz bandwidth with 0.1μF & 47μF parallel capacitor. 3. The WDR-120-24 does not include active PFC; PFC is available on WDR-240 and WDR-480. 4. Derating is required above +50°C ambient. 5. TB2 pin order differs from WDR-60 and WDR-240 — verify terminal labels before wiring.
Dimensions
WDR-120-24 Dimensions
Slim 40 mm metal housing designed for space-constrained control cabinets. All dimensions in mm, tolerance ±1 mm.
Mechanical Dimensions
| Width (W) | 40 mm |
| Height (H) | 125.2 mm |
| Depth (D) | 113.5 mm |
| Weight | Approx. 0.65 kg |
| Housing | Metal, slim design |
| Front Panel | +V ADJ / DC OK |
Installation Clearances
| Top Clearance | 40 mm |
| Bottom Clearance | 20 mm |
| Left / Right Clearance | 5 mm |
| Adjacent Heat Source | 15 mm recommended |
| DIN Rail | TS35/7.5 or TS35/15 |
| Mounting Orientation | Vertical only (input bottom, output top) |
Installation
WDR-120-24 Installation
The WDR-120-24 supports TS35 DIN rail mounting with specific ventilation clearance and orientation requirements for reliable operation.
01 / 06
Vertical Orientation Only
The appropriate mounting orientation is vertical — input terminals at the bottom and output terminals at the top. Upside-down, horizontal or table-top mounting is not allowed, as sufficient cooling will not be possible.
02 / 06
Ventilation Clearance
Always allow good ventilation clearances around the unit: 5 mm left and right, 40 mm above and 20 mm below, to prevent overheating. When the adjacent device is a heat source, keep 15 mm clearance.
03 / 06
TS35 DIN Rail Mounting
Admissible DIN rail: TS35/7.5 or TS35/15. Tilt the unit slightly rearwards, fit over the top hat rail, slide it downward until it hits the stop, press against the bottom for locking, then shake slightly to check the locking action.
04 / 06
FG Must Be Connected to PE
The FG (Frame Ground) terminal must be connected to PE (Protective Earth) for safety and to ensure proper EMC performance.
05 / 06
Operating Temperature Limits
The WDR-120-24 operates from −25°C to +70°C, with derating required above +50°C. Do not install near fire sources or in high ambient temperature locations.
06 / 06
Pollution Degree 2 Environment
Install the unit only in a pollution degree 2 environment — typically dry, well-ventilated locations such as control cabinets. Do not install in places with high moisture or near water.
Wiring & Terminal
WDR-120-24 Wiring & Terminal
The WDR-120-24 uses two terminal blocks: TB1 for input and TB2 for output. TB2 pin order differs from other WDR models — verify the terminal label before wiring.
Terminal Pin Assignment
TB1 — Input Terminal
| Pin No. | Assignment |
|---|---|
| 1 | FG (Frame Ground) |
| 2 | AC/L2 |
| 3 | AC/L1 |
For single-phase: L1 to live, L2 to neutral. For two-phase: L1 and L2 to two phases of a three-phase network (no neutral needed).
TB2 — Output & DC OK (4 Pins)
| Pin No. | Assignment |
|---|---|
| 1, 2 | DC OK relay contact (30V/1A) |
| 3 | DC OUTPUT −V |
| 4 | DC OUTPUT +V |
Note: The WDR-120 TB2 pin order places the relay contact first. This differs from the WDR-60 (output first) and WDR-240 (relay first, then +V, then −V). Verify terminal labels before wiring.
The FG pin must be connected to PE (Protective Earth). The DC OK relay contact is a dry contact — do not use it as a power output. For two-phase input, both AC/L1 and AC/L2 must be connected to live phases; do not connect either to neutral.
Wiring Specification
Recommended Wire
| AWG | Rated Current | Cross-section |
|---|---|---|
| 18 | 0–6 A | 0.75 mm² |
| 16 | 6–10 A | 1.00 mm² |
| 14 | 13–16 A | 1.52 mm² |
Use stranded copper wire rated at least 80°C, such as UL1007.
Terminal Torque Setting
| Model | Torque |
|---|---|
| WDR-120-24 | 5 kgf-cm (4.4 Lb-in) |
Recommended screwdriver: 3 mm slotted type.
Input Configuration
| Single-Phase | L1 live, L2 neutral |
| Two-Phase | L1 and L2 to two phases, no neutral |
| DC Input | 254–780 VDC (L1 and L2) |
| Frequency | 47–63 Hz |
DC Output Voltage Adjustment
The WDR-120-24 includes a front-panel +V ADJ potentiometer with a 24–29V adjustment range and a DC OK indicator LED. Output current and wattage must not exceed the rated 5A / 120W. When adjusting toward 29V, verify that all connected 24V devices tolerate the higher voltage.
Safety & Compliance
WDR-120-24 Safety & Cautions
Read and follow all safety instructions before installing, wiring, maintaining or modifying the WDR-120-24 power supply.
- Risk of electrical shock and energy hazard. All failure should be examined by a qualified technician. Do not remove the case of the power supply yourself.
- Connecting both the primary and the secondary sides together is not allowed — risk of electric arcs and electric shock (danger to life).
- Risk of burn hazard. Do not touch the unit in operation and shortly after disconnection.
- Risk of fire and short circuit. The openings should be protected from foreign objects or dripping liquids.
- The FG (Frame Ground) must be connected to PE (Protective Earth).
- Output current and output wattage must not exceed the rated 5A / 120W.
- Before commencing any installation, maintenance or modification work, disconnect the system from supply voltage. Make sure that inadvertent connection in circuit will be impossible.
- Do not use the DC OK relay contact as a power output. Observe its 30V/1A resistive rating.
- The power supply is considered a component which will be installed into a final equipment. The final equipment must be re-confirmed that it still meets EMC directives.
Note: Pollution Degree 2 applies where there is only non-conductive pollution that might temporarily become conductive due to occasional condensation. Generally refers to dry, well-ventilated locations, such as control cabinets.
Applications
WDR-120-24 Industrial Applications
The WDR-120-24 is suitable for 380V/400V/480V industrial systems, two-phase networks without a neutral, semiconductor fabrication equipment, factory automation and telecommunication installations.
380V/400V/480V Systems
Two-Phase Networks
Semiconductor Fabrication
Factory Automation
Telecommunication
Electrical Panels
Process Control
Test & Measurement
Surveillance Systems
Next Step
Need the WDR-120-24 for Your Application?
Contact DAPPRA Automation for specifications, installation support and purchasing assistance — or explore the full WDR Series.
Support
WDR-120-24 FAQ
What is the DAPPRA WDR-120-24?
The DAPPRA WDR-120-24 (SKU: OF61) is a 120W single-output industrial DIN rail power supply providing 24V DC at 5A. It accepts an ultra-wide 180–550VAC single-phase or two-phase input and features a built-in DC OK relay contact, 3KVAC I/O isolation, and 91% typical efficiency at 400VAC.
What is the input voltage range of the WDR-120-24?
The WDR-120-24 supports an ultra-wide AC input range of 180–550VAC (single-phase or two-phase) and 254–780VDC. It is suitable for 220V, 380V, 400V and 480V mains networks, as well as two-phase operation of a three-phase system without a neutral.
Does the WDR-120-24 have active PFC?
No. Within the WDR Series, built-in active PFC is available on the WDR-240 and WDR-480 models only. The WDR-120-24 is designed without active PFC and is intended for applications where PFC is not a system requirement.
What is the efficiency of the WDR-120-24?
The WDR-120-24 achieves 91% typical efficiency at 400VAC input and full load. Actual efficiency varies with input voltage and load conditions.
What is the output voltage adjustment range of the WDR-120-24?
The WDR-120-24 has a 24–29V output adjustment range via the front-panel +V ADJ potentiometer. The 29V upper limit is approximately 20.8% above the 24V nominal; verify that every connected 24V device tolerates the higher voltage before turning the potentiometer up.
What is the over-voltage protection threshold of the WDR-120-24?
Over-voltage protection triggers at 29–33V for the 24V model. The output shuts down and recovers automatically after the fault condition is removed.
What is the overload protection behavior of the WDR-120-24?
The WDR-120-24 uses 105–130% rated output power constant-current limiting with automatic recovery after the fault is removed. It does not have the delayed shutdown behavior found on the WDR-240 and WDR-480.
What is the isolation voltage of the WDR-120-24?
The WDR-120-24 provides 3KVAC isolation between input and output. This is lower than the 4.7KVAC reinforced isolation on the WDR-60, but sufficient for most industrial control applications.
What is the terminal pin assignment of the WDR-120-24?
TB1 (Input): Pin 1 = FG, Pin 2 = AC/L2, Pin 3 = AC/L1. TB2 (Output, 4 pins): Pins 1,2 = DC OK relay contact; Pin 3 = DC OUTPUT −V; Pin 4 = DC OUTPUT +V. The TB2 order differs from the WDR-60 and WDR-240 — verify the terminal label before wiring.
Does the WDR-120-24 have a DC OK relay contact?
Yes. The WDR-120-24 includes a built-in DC OK relay contact rated 30V/1A resistive load on TB2 pins 1 and 2. Contact Close = PSU turns on / DC OK; Contact Open = PSU turns off / DC Fail.
What is the operating temperature range of the WDR-120-24?
The WDR-120-24 operates from −25°C to +70°C with free air convection cooling. Derating is required above +50°C ambient.
What are the dimensions and weight of the WDR-120-24?
The WDR-120-24 measures 40 × 125.2 × 113.5 mm (W × H × D) and weighs approximately 0.65 kg. The 40 mm slim metal housing saves DIN rail space in control cabinets.
Can the WDR-120-24 accept two phases of a three-phase supply?
Yes. The WDR-120-24 is designed for both single-phase and two-phase operation. For two-phase input, connect AC/L1 and AC/L2 to two phases of a three-phase network without a neutral. This is particularly useful in 380V/400V/480V systems where a neutral conductor is not available.
What certifications does the WDR-120-24 have?
The WDR-120-24 is certified to UL508 and EAC TP TC 004, and complies with BS EN/EN61000-6-2 (BS EN/EN50082-2) industrial immunity level and BS EN/EN55032 Class B EMC emission. Confirm certificate coverage for your destination market.
What is the MTBF of the WDR-120-24?
The WDR-120-24 has a minimum MTBF of 1509.6K hours (Telcordia SR-332) and 268.1K hours (MIL-HDBK-217F at 25°C), reflecting the long-life design of the WDR Series.
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Overview
WDR-120-24 Overview
The DAPPRA WDR-120-24 (SKU: OF61) is a 120W single-output industrial DIN rail power supply in the WDR Series. It provides a stable 24V DC output at 5A rated current from an ultra-wide 180–550 VAC single-phase or two-phase input, or 254–780 VDC input, with 91% typical efficiency at 400VAC.
Designed for industrial power systems where conventional 90–264VAC supplies cannot be used, the WDR-120-24 accepts two phases of a 380V/400V/480V three-phase network without a neutral. It features a slim 40 mm metal housing, fanless natural convection cooling, a built-in DC OK relay contact, and complete protection functions including short circuit, overload (105–130% constant current limiting, auto-recovery) and over-voltage (29–33V, auto-recovery). The unit operates from −25°C to +70°C with derating above +50°C and mounts on TS35/7.5 or TS35/15 DIN rail.
Key Features
WDR-120-24 Key Features
Engineered for ultra-wide input 24V power in industrial systems without a neutral conductor.
- 120W Output · 24V / 5ASingle output providing 24V DC at 5A (0–5A range) with 120W rated power. Output adjustable 24–29V via +V ADJ.
- Ultra-Wide AC Input 180–550 VACSingle-phase and two-phase input. Also accepts 254–780 VDC. Suitable for 220V, 380V, 400V and 480V systems, and two-phase operation without a neutral.
- 91% Typical Efficiency at 400VACHigh efficiency reduces energy consumption and heat generation inside the control cabinet.
- Built-in DC OK Relay ContactDry relay contact on TB2 pins 1–2 for remote status monitoring or direct PLC input.
- 3KVAC I/O IsolationInput-to-output isolation suitable for most industrial control and automation applications.
- Complete Protection FunctionsShort circuit, overload (105–130% constant current limiting, auto-recovery) and over-voltage (29–33V, auto-recovery) protection.
- Slim 40 mm Metal HousingThe 40 × 125.2 × 113.5 mm metal housing saves DIN rail space while providing mechanical robustness.
- Fanless Natural Convection CoolingNo fan means no dust intake and no moving parts — ideal for dusty industrial environments.
- TS35 DIN Rail MountingDesigned for standard TS35/7.5 or TS35/15 DIN rail mounting. UL508 approved with 3-year warranty.
Specifications
WDR-120-24 Specifications
Complete technical specifications for the WDR-120-24 ultra-wide input DIN rail power supply.
Output
| DC Output Voltage | 24V |
| Rated Current | 5A |
| Current Range | 0–5A |
| Rated Power | 120W |
| Ripple & Noise (max.) | 120mVp-p |
| Voltage Adjustment Range | 24–29V |
| Voltage Tolerance | ±1.0% |
| Line Regulation | ±0.5% |
| Load Regulation | ±0.5% |
| Setup, Rise Time | 2000ms, 70ms, 50ms / 400VAC · 2000ms, 70ms, 10ms / 230VAC at full load |
Input
| Voltage Range | 180–550VAC · 254–780VDC |
| Frequency Range | 47–63Hz |
| Efficiency (Typ.) | 91% at 400VAC |
| AC Current (Typ.) | 0.7A / 400VAC · 1.2A / 230VAC |
| Inrush Current (Typ.) | Cold start 50A at 400VAC |
| Leakage Current | <3.5mA at 530VAC |
Protection
| Overload | 105–130% rated output power · Constant current limiting · Auto-recovery |
| Over Voltage | 29–33V · Shut down output, auto-recovery |
| Over Temperature | Shut down output; auto-recovery after temperature falls |
| Short Circuit | Protected |
Environment
| Working Temperature | −25 ~ +70°C (Derating above +50°C) |
| Working Humidity | 20–90% RH non-condensing |
| Storage Temp., Humidity | −40 ~ +85°C, 10–95% RH |
| Vibration | 10–500Hz, 2G 10min./1cycle, 60min. each along X, Y, Z axes |
Safety & EMC
| Safety Standards | UL508, EAC TP TC 004 |
| Withstand Voltage | I/P-O/P: 3KVAC · I/P-FG: 1.5KVAC · O/P-FG: 0.5KVAC |
| Isolation Resistance | >100M Ohms / 500VDC |
| EMC Emission | BS EN/EN55032 Class B |
| EMC Immunity | BS EN/EN61000-6-2 (BS EN/EN50082-2) heavy industry level |
Reliability & Dimensions
| MTBF | 1509.6K hrs min. Telcordia SR-332 · 268.1K hrs min. MIL-HDBK-217F (25°C) |
| Dimensions (W×H×D) | 40 × 125.2 × 113.5 mm |
| Weight | Approx. 0.65 kg |
| Warranty | 3 Years |
Front Panel & DC OK
| +V ADJ | Output voltage adjustment potentiometer (24–29V) |
| DC OK LED | DC output status indicator |
| DC OK Contact | Relay contact, max. 30V/1A resistive load |
| Contact Close | PSU turns on / DC OK |
| Contact Open | PSU turns off / DC Fail |
Notes
1. All parameters measured at 400VAC input, rated load and 25°C ambient unless noted. 2. Ripple & noise measured at 20MHz bandwidth with 0.1μF & 47μF parallel capacitor. 3. The WDR-120-24 does not include active PFC; PFC is available on WDR-240 and WDR-480. 4. Derating is required above +50°C ambient. 5. TB2 pin order differs from WDR-60 and WDR-240 — verify terminal labels before wiring.
Dimensions
WDR-120-24 Dimensions
Slim 40 mm metal housing designed for space-constrained control cabinets. All dimensions in mm, tolerance ±1 mm.
Mechanical Dimensions
| Width (W) | 40 mm |
| Height (H) | 125.2 mm |
| Depth (D) | 113.5 mm |
| Weight | Approx. 0.65 kg |
| Housing | Metal, slim design |
| Front Panel | +V ADJ / DC OK |
Installation Clearances
| Top Clearance | 40 mm |
| Bottom Clearance | 20 mm |
| Left / Right Clearance | 5 mm |
| Adjacent Heat Source | 15 mm recommended |
| DIN Rail | TS35/7.5 or TS35/15 |
| Mounting Orientation | Vertical only (input bottom, output top) |
Installation
WDR-120-24 Installation
The WDR-120-24 supports TS35 DIN rail mounting with specific ventilation clearance and orientation requirements for reliable operation.
01 / 06
Vertical Orientation Only
The appropriate mounting orientation is vertical — input terminals at the bottom and output terminals at the top. Upside-down, horizontal or table-top mounting is not allowed, as sufficient cooling will not be possible.
02 / 06
Ventilation Clearance
Always allow good ventilation clearances around the unit: 5 mm left and right, 40 mm above and 20 mm below, to prevent overheating. When the adjacent device is a heat source, keep 15 mm clearance.
03 / 06
TS35 DIN Rail Mounting
Admissible DIN rail: TS35/7.5 or TS35/15. Tilt the unit slightly rearwards, fit over the top hat rail, slide it downward until it hits the stop, press against the bottom for locking, then shake slightly to check the locking action.
04 / 06
FG Must Be Connected to PE
The FG (Frame Ground) terminal must be connected to PE (Protective Earth) for safety and to ensure proper EMC performance.
05 / 06
Operating Temperature Limits
The WDR-120-24 operates from −25°C to +70°C, with derating required above +50°C. Do not install near fire sources or in high ambient temperature locations.
06 / 06
Pollution Degree 2 Environment
Install the unit only in a pollution degree 2 environment — typically dry, well-ventilated locations such as control cabinets. Do not install in places with high moisture or near water.
Wiring & Terminal
WDR-120-24 Wiring & Terminal
The WDR-120-24 uses two terminal blocks: TB1 for input and TB2 for output. TB2 pin order differs from other WDR models — verify the terminal label before wiring.
Terminal Pin Assignment
TB1 — Input Terminal
| Pin No. | Assignment |
|---|---|
| 1 | FG (Frame Ground) |
| 2 | AC/L2 |
| 3 | AC/L1 |
For single-phase: L1 to live, L2 to neutral. For two-phase: L1 and L2 to two phases of a three-phase network (no neutral needed).
TB2 — Output & DC OK (4 Pins)
| Pin No. | Assignment |
|---|---|
| 1, 2 | DC OK relay contact (30V/1A) |
| 3 | DC OUTPUT −V |
| 4 | DC OUTPUT +V |
Note: The WDR-120 TB2 pin order places the relay contact first. This differs from the WDR-60 (output first) and WDR-240 (relay first, then +V, then −V). Verify terminal labels before wiring.
The FG pin must be connected to PE (Protective Earth). The DC OK relay contact is a dry contact — do not use it as a power output. For two-phase input, both AC/L1 and AC/L2 must be connected to live phases; do not connect either to neutral.
Wiring Specification
Recommended Wire
| AWG | Rated Current | Cross-section |
|---|---|---|
| 18 | 0–6 A | 0.75 mm² |
| 16 | 6–10 A | 1.00 mm² |
| 14 | 13–16 A | 1.52 mm² |
Use stranded copper wire rated at least 80°C, such as UL1007.
Terminal Torque Setting
| Model | Torque |
|---|---|
| WDR-120-24 | 5 kgf-cm (4.4 Lb-in) |
Recommended screwdriver: 3 mm slotted type.
Input Configuration
| Single-Phase | L1 live, L2 neutral |
| Two-Phase | L1 and L2 to two phases, no neutral |
| DC Input | 254–780 VDC (L1 and L2) |
| Frequency | 47–63 Hz |
DC Output Voltage Adjustment
The WDR-120-24 includes a front-panel +V ADJ potentiometer with a 24–29V adjustment range and a DC OK indicator LED. Output current and wattage must not exceed the rated 5A / 120W. When adjusting toward 29V, verify that all connected 24V devices tolerate the higher voltage.
Safety & Compliance
WDR-120-24 Safety & Cautions
Read and follow all safety instructions before installing, wiring, maintaining or modifying the WDR-120-24 power supply.
- Risk of electrical shock and energy hazard. All failure should be examined by a qualified technician. Do not remove the case of the power supply yourself.
- Connecting both the primary and the secondary sides together is not allowed — risk of electric arcs and electric shock (danger to life).
- Risk of burn hazard. Do not touch the unit in operation and shortly after disconnection.
- Risk of fire and short circuit. The openings should be protected from foreign objects or dripping liquids.
- The FG (Frame Ground) must be connected to PE (Protective Earth).
- Output current and output wattage must not exceed the rated 5A / 120W.
- Before commencing any installation, maintenance or modification work, disconnect the system from supply voltage. Make sure that inadvertent connection in circuit will be impossible.
- Do not use the DC OK relay contact as a power output. Observe its 30V/1A resistive rating.
- The power supply is considered a component which will be installed into a final equipment. The final equipment must be re-confirmed that it still meets EMC directives.
Note: Pollution Degree 2 applies where there is only non-conductive pollution that might temporarily become conductive due to occasional condensation. Generally refers to dry, well-ventilated locations, such as control cabinets.
Applications
WDR-120-24 Industrial Applications
The WDR-120-24 is suitable for 380V/400V/480V industrial systems, two-phase networks without a neutral, semiconductor fabrication equipment, factory automation and telecommunication installations.
380V/400V/480V Systems
Two-Phase Networks
Semiconductor Fabrication
Factory Automation
Telecommunication
Electrical Panels
Process Control
Test & Measurement
Surveillance Systems
Next Step
Need the WDR-120-24 for Your Application?
Contact DAPPRA Automation for specifications, installation support and purchasing assistance — or explore the full WDR Series.
Support
WDR-120-24 FAQ
What is the DAPPRA WDR-120-24?
The DAPPRA WDR-120-24 (SKU: OF61) is a 120W single-output industrial DIN rail power supply providing 24V DC at 5A. It accepts an ultra-wide 180–550VAC single-phase or two-phase input and features a built-in DC OK relay contact, 3KVAC I/O isolation, and 91% typical efficiency at 400VAC.
What is the input voltage range of the WDR-120-24?
The WDR-120-24 supports an ultra-wide AC input range of 180–550VAC (single-phase or two-phase) and 254–780VDC. It is suitable for 220V, 380V, 400V and 480V mains networks, as well as two-phase operation of a three-phase system without a neutral.
Does the WDR-120-24 have active PFC?
No. Within the WDR Series, built-in active PFC is available on the WDR-240 and WDR-480 models only. The WDR-120-24 is designed without active PFC and is intended for applications where PFC is not a system requirement.
What is the efficiency of the WDR-120-24?
The WDR-120-24 achieves 91% typical efficiency at 400VAC input and full load. Actual efficiency varies with input voltage and load conditions.
What is the output voltage adjustment range of the WDR-120-24?
The WDR-120-24 has a 24–29V output adjustment range via the front-panel +V ADJ potentiometer. The 29V upper limit is approximately 20.8% above the 24V nominal; verify that every connected 24V device tolerates the higher voltage before turning the potentiometer up.
What is the over-voltage protection threshold of the WDR-120-24?
Over-voltage protection triggers at 29–33V for the 24V model. The output shuts down and recovers automatically after the fault condition is removed.
What is the overload protection behavior of the WDR-120-24?
The WDR-120-24 uses 105–130% rated output power constant-current limiting with automatic recovery after the fault is removed. It does not have the delayed shutdown behavior found on the WDR-240 and WDR-480.
What is the isolation voltage of the WDR-120-24?
The WDR-120-24 provides 3KVAC isolation between input and output. This is lower than the 4.7KVAC reinforced isolation on the WDR-60, but sufficient for most industrial control applications.
What is the terminal pin assignment of the WDR-120-24?
TB1 (Input): Pin 1 = FG, Pin 2 = AC/L2, Pin 3 = AC/L1. TB2 (Output, 4 pins): Pins 1,2 = DC OK relay contact; Pin 3 = DC OUTPUT −V; Pin 4 = DC OUTPUT +V. The TB2 order differs from the WDR-60 and WDR-240 — verify the terminal label before wiring.
Does the WDR-120-24 have a DC OK relay contact?
Yes. The WDR-120-24 includes a built-in DC OK relay contact rated 30V/1A resistive load on TB2 pins 1 and 2. Contact Close = PSU turns on / DC OK; Contact Open = PSU turns off / DC Fail.
What is the operating temperature range of the WDR-120-24?
The WDR-120-24 operates from −25°C to +70°C with free air convection cooling. Derating is required above +50°C ambient.
What are the dimensions and weight of the WDR-120-24?
The WDR-120-24 measures 40 × 125.2 × 113.5 mm (W × H × D) and weighs approximately 0.65 kg. The 40 mm slim metal housing saves DIN rail space in control cabinets.
Can the WDR-120-24 accept two phases of a three-phase supply?
Yes. The WDR-120-24 is designed for both single-phase and two-phase operation. For two-phase input, connect AC/L1 and AC/L2 to two phases of a three-phase network without a neutral. This is particularly useful in 380V/400V/480V systems where a neutral conductor is not available.
What certifications does the WDR-120-24 have?
The WDR-120-24 is certified to UL508 and EAC TP TC 004, and complies with BS EN/EN61000-6-2 (BS EN/EN50082-2) industrial immunity level and BS EN/EN55032 Class B EMC emission. Confirm certificate coverage for your destination market.
What is the MTBF of the WDR-120-24?
The WDR-120-24 has a minimum MTBF of 1509.6K hours (Telcordia SR-332) and 268.1K hours (MIL-HDBK-217F at 25°C), reflecting the long-life design of the WDR Series.
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