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NDR-240-24 240W 24V 10A Industrial DIN Rail Power Supply
Rp520,000.00
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DAPPRA NDR-240-24 (SKU: OF58) is a 240W single output slim industrial DIN rail power supply with 24V DC / 10A output and universal 90–264 VAC input. Built-in active PFC, 88.5% typical efficiency, slim 63 mm metal housing, fanless natural convection cooling, complete protection functions, UL508 approved, TS35 DIN rail mounting, 3-year warranty — ideal for medium-power industrial control, factory automation and electrical panels.
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Overview
NDR-240-24 Overview
The DAPPRA NDR-240-24 (SKU: OF58) is a 240W single output slim industrial DIN rail power supply designed for medium-power industrial control, factory automation and electromechanical applications. It provides a stable 24V DC output at 10A rated current from a universal 90–264 VAC input or 127–370 VDC input, and includes built-in active PFC for improved power quality.
The unit features a 63 mm wide metal housing that enhances power dissipation, fanless natural convection cooling, and complete protection functions including short circuit, overload (constant current limiting, auto-recovery), over voltage (29–33V) and over temperature protection. Designed for TS35/7.5 or TS35/15 DIN rail mounting and certified to UL508, the NDR-240-24 delivers a reliable 88.5% efficiency 24V power solution for demanding industrial loads.
Key Features
NDR-240-24 Key Features
Engineered for medium-power, space-saving 24V industrial power supply applications.
- 240W Output · 24V / 10ASingle output configuration providing 24V DC nominal output at 10A rated current (0~10A current range) with 240W rated output power.
- Built-in Active PFCActive power factor correction with PF >0.98 at 115VAC and PF >0.95 at 230VAC under full load, reducing harmonic current and improving power quality.
- Universal AC Input 90–264 VACFull-range single-phase AC input supports global mains voltages. Also supports 127–370 VDC input (DC operation by connecting AC/L(+) and AC/N(−)).
- 24~28V Output AdjustmentFront-panel +V ADJ potentiometer allows the rated output voltage to be adjusted between 24V and 28V to suit the connected load.
- 88.5% Typical EfficiencyThe NDR-240-24 achieves 88.5% typical efficiency, balancing performance with manageable heat generation inside the control cabinet.
- Slim 63 mm Metal HousingThe 63 × 125.2 × 113.5 mm metal housing enhances power dissipation and saves DIN rail space inside control cabinets.
- Fanless Natural Convection CoolingNo fan means no dust intake, no acoustic noise and no moving parts — ideal for dusty industrial environments and silent operation.
- Complete Protection FunctionsShort circuit, overload (105–130% rated output power, constant current limiting, auto-recovery), over voltage (29–33V, shut down and re-power) and over temperature protection (auto-recovery after cooling) are built in.
- TS35 DIN Rail MountingDesigned for standard TS35/7.5 or TS35/15 DIN rail mounting inside electrical panels, control cabinets and automation equipment.
- UL508 & 3-Year WarrantyCertified to UL508 (industrial control equipment), TUV BS EN/EN62368-1 and EAC TP TC 004, and backed by a 3-year DAPPRA warranty.
Specifications
NDR-240-24 Specifications
Complete technical specifications for the NDR-240-24 industrial DIN rail power supply.
Output
| DC Output Voltage | 24V |
| Rated Current | 10A |
| Current Range | 0~10A |
| Rated Power | 240W |
| Ripple & Noise (max.) | 150mVp-p |
| Voltage Adjustment Range | 24~28V |
| Voltage Tolerance | ±1.0% |
| Line Regulation | ±0.5% |
| Load Regulation | ±1.0% |
| Setup, Rise Time | 1500ms, 100ms/230VAC · 3000ms, 100ms/115VAC at full load |
| Hold Up Time (Typ.) | 28ms/230VAC · 22ms/115VAC at full load |
Input
| Voltage Range | 90~264VAC · 127~370VDC |
| Frequency Range | 47~63Hz |
| Power Factor (Typ.) | PF >0.98/115VAC · PF >0.95/230VAC at full load |
| Efficiency (Typ.) | 88.5% |
| AC Current (Typ.) | 2.5A/115VAC · 1.3A/230VAC |
| Inrush Current (Typ.) | 20A/115VAC · 35A/230VAC |
| Leakage Current | <1mA/240VAC |
Protection
| Overload | 105~130% rated output power · Constant current limiting · Auto-recovery after fault removed |
| Over Voltage | 29~33V · Shut down output, re-power on to recover |
| Over Temperature | Shut down output; auto-recovery after temperature falls |
| Short Circuit | Protected |
Environment
| Working Temperature | −20 ~ +70°C (Refer to Derating Curve; full load up to 50°C) |
| Working Humidity | 20~95% RH non-condensing |
| Storage Temp., Humidity | −40 ~ +85°C, 10~95% RH |
| Temp. Coefficient | ±0.03%/°C (0~50°C) |
| Vibration | 10~500Hz, 2G 10min./1cycle, 60min. each along X, Y, Z axes |
Safety & EMC
| Safety Standards | UL508, TUV BS EN/EN62368-1, EAC TP TC 004; meets BS EN/EN60204-1 |
| Withstand Voltage | I/P-O/P: 3KVAC · I/P-FG: 2KVAC · O/P-FG: 0.5KVAC |
| Isolation Resistance | >100M Ohms / 500VDC / 25°C / 70% RH |
| EMC Emission | BS EN/EN55032 (CISPR32) Class B · BS EN/EN61000-3-2,-3 |
| EMC Immunity | BS EN/EN61000-4-2, 3, 4, 5, 6, 8, 11 · BS EN/EN61000-6-2 (BS EN/EN50082-2) heavy industry level |
Reliability & Dimensions
| MTBF | 1645.2K hrs min. Telcordia SR-332 (Bellcore) · 230.2K hrs min. MIL-HDBK-217F (25°C) |
| Dimensions (W×H×D) | 63 × 125.2 × 113.5 mm |
| Weight | 1.0 Kg |
| Packing | 1.0Kg; 12pcs/13Kg/1.1CUFT |
| Warranty | 3 Years |
Front Panel Controls
| +V ADJ | Output voltage adjustment potentiometer (24~28V) |
| DC OK | DC output OK indicator LED |
| Terminal TB1 | Input: FG / AC-N-DC− / AC-L-DC+ |
| Terminal TB2 | Output: −V (pins 1,2) / +V (pins 3,4) |
Notes
1. All parameters not specially mentioned are measured at 230VAC input, rated load and 25°C ambient temperature. 2. Ripple & noise are measured at 20MHz of bandwidth with a 12" twisted pair-wire terminated with a 0.1μF & 47μF parallel capacitor. 3. Tolerance includes set-up tolerance, line regulation and load regulation. 4. The power supply is considered a component to be installed into a final equipment; the final equipment must be re-confirmed to meet EMC directives. 5. Derating may be needed under low input voltage. 6. The NDR-240-24 includes built-in active PFC (PF >0.98/115VAC, >0.95/230VAC). 7. Full-load operation is specified up to 50°C ambient; refer to the derating curve for operation above 50°C. 8. Installation clearances: 40mm top, 20mm bottom, 5mm left/right; 15mm from adjacent heat sources.
Model Information
NDR-240-24 Model Code
The model number identifies the NDR Series, output wattage and output voltage. DAPPRA SKU for this model: OF58.
Model Code
NDR
-
240
-
24
NDRSeries prefix — DAPPRA NDR Series Slim DIN Rail Power Supply.
240 — Output WattageOutput power rating in Watts. This model provides 240W.
24 — Output VoltageNominal output voltage in VDC. This model provides 24V DC output.
Field
Meaning
Value
NDR
Series prefix
NDR
Output Wattage
Rated output power in Watts
240W
Output Voltage
Nominal DC output voltage
24V
Example: NDR-240-24 = NDR Series, 240W output power, 24V DC output voltage. DAPPRA SKU: OF58.
Dimensions
NDR-240-24 Dimensions
Slim 63 mm metal housing with a compact footprint designed for space-constrained control cabinets. All dimensions in mm, tolerance ±1 mm.
Mechanical Dimensions
| Width (W) | 63 mm |
| Height (H) | 125.2 mm |
| Depth (D) | 113.5 mm |
| DIN Rail Slot to Top (S) | 35 mm |
| Weight | 1.0 Kg |
| 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
NDR-240-24 Installation
The NDR-240-24 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 NDR-240-24 operates from −20°C to +70°C, with full-load operation specified up to 50°C ambient. Refer to the derating curve for operation above 50°C.
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
NDR-240-24 Wiring & Terminal
The NDR-240-24 uses two terminal blocks: TB1 for input and TB2 for output. Use copper wire only and ensure all strands of each stranded wire enter the terminal connection and the screw terminals are securely fixed to prevent poor contact.
Terminal Pin Assignment
TB1 — Input Terminal
| Pin No. | Assignment |
|---|---|
| 1 | FG (Frame Ground) |
| 2 | AC/N or DC− |
| 3 | AC/L or DC+ |
TB2 — Output Terminal
| Pin No. | Assignment |
|---|---|
| 1, 2 | DC OUTPUT −V |
| 3, 4 | DC OUTPUT +V |
The FG pin must be connected to PE (Protective Earth). Both −V pins (1, 2) and both +V pins (3, 4) should be connected to their respective output wires to prevent excessive current stress on a single contact. DC input operation is possible by connecting AC/L(+), AC/N(−).
Wiring Specification
Recommended Wire
| AWG | Rated Current | Cross-section |
|---|---|---|
| 18 | 7 A | 0.8 mm² |
| 16 | 10 A | 1.3 mm² |
| 14 | 15 A | 2.1 mm² |
| 12 | 20 A | 3.3 mm² |
Current each wire carries should be de-rated to 80% of the current suggested above when using 5 or more wires connected to the unit. Use wires that can withstand temperatures of at least 80°C, such as UL1007.
Terminal Torque Setting
| Model | I/P | O/P |
|---|---|---|
| NDR-240 | 7.5 kgf-cm (6.5 Lb-in) | 7.5 kgf-cm (6.5 Lb-in) |
Recommended wire strapping length: 5 mm (0.197"). Recommended screwdriver: 3 mm, slotted type.
Fuse & Circuit Breaker (230V)
| Model | Fuse | C16 | D16 |
|---|---|---|---|
| NDR-240 | T5A/L250V | 4 | 10 |
Maximum number of NDR-240 PSUs that can be connected to a circuit breaker at 230V. For continued protection against risk of fire, replace only with the same type and rating of fuse.
DC Output Voltage Adjustment
The NDR-240-24 includes a front-panel DC output voltage adjustment potentiometer (+V ADJ) and a DC OK indicator LED. The rated output voltage can be adjusted between 24V and 28V via the front-panel adjuster. Output current and output wattage must not exceed the rated value on its specification.
Safety & Compliance
NDR-240-24 Safety & Cautions
Read and follow all safety instructions before installing, wiring, maintaining or modifying the NDR-240-24 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 value on its specification.
- Before commencing any installation, maintenance or modification work, disconnect the system from supply voltage. Make sure that inadvertent connection in circuit will be impossible.
- For continued protection against risk of fire, replace only with the same type and rating of fuse.
- 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
NDR-240-24 Industrial Applications
The NDR-240-24 is suitable for medium-power industrial control systems, factory automation equipment, electromechanical apparatus, electrical panels and semiconductor manufacturing equipment.
Industrial Control Systems
Factory Automation
Electromechanical Apparatus
Electrical Panels
Semiconductor Equipment
Machine Control
Process Control
Test & Measurement
Building Automation
PLC & Sensor Power
Industrial LED Lighting
Security & Access Control
Next Step
Need the NDR-240-24 for Your Application?
Contact DAPPRA Automation for product specifications, installation support, technical documentation and purchasing assistance — or explore the full NDR Series and industrial power supply range.
Support
NDR-240-24 FAQ
What is the DAPPRA NDR-240-24 power supply?
The DAPPRA NDR-240-24 (SKU: OF58) is a 240W industrial DIN rail power supply that delivers 24V DC at a rated current of 10A. It is designed for compatible industrial control panels and automation equipment.
What is the maximum rated output of the NDR-240-24?
The NDR-240-24 provides 24V DC, up to 10A, with a rated output power of 240W. The combined load should remain within these ratings under the actual operating conditions.
Can the NDR-240-24 power a PLC, HMI and sensors from one supply?
Yes, provided the connected devices all accept 24V DC and their combined steady-state and startup current stays within the power supply's capacity. Check each device's electrical specifications and account for any inductive loads.
What is the output voltage adjustment range of the NDR-240-24?
The NDR-240-24 has an adjustable output range of 24–28V DC using the front-panel +V ADJ control. Before increasing the voltage, confirm that every connected device can tolerate the selected voltage.
What AC input range does the NDR-240-24 support?
The NDR-240-24 supports a universal AC input range of 90–264VAC (47–63Hz) and a DC input range of 127–370VDC. DC input operation is possible by connecting AC/L(+) and AC/N(−).
Does the NDR-240-24 have active PFC?
Yes. The NDR-240-24 includes built-in active power factor correction (PFC), with a typical power factor greater than 0.98 at 115VAC and greater than 0.95 at 230VAC under full load.
How can I tell whether the DC output of the NDR-240-24 is operating normally?
The front panel has a DC OK indicator. Check the indicator together with a voltage measurement at the output terminals and, if necessary, at the connected load.
Is 240W enough for a control cabinet with multiple 24V devices?
It depends on the total load. Add the rated power consumption of the PLC, HMI, sensors, relays, valves and other connected devices, then allow additional capacity for startup current and future expansion.
Can the NDR-240-24 drive motors directly?
Do not assume it can drive a motor directly. Check the motor's voltage, current, startup demand and drive requirements. A motor requiring a dedicated driver or controller should be connected through compatible equipment.
What should I consider when wiring several loads to the 24V output of the NDR-240-24?
Use appropriately rated conductors and terminals, observe positive and negative polarity, and consider the current carried by each branch. Separate branch protection may be needed depending on the equipment and applicable electrical standards.
How does cable length affect a 24V DC installation?
Long cables can cause voltage drop, especially when loads draw substantial current. Select the wire size based on current, cable length and acceptable voltage drop, and measure voltage at the load during operation.
Can the NDR-240-24 be mounted on a standard DIN rail?
Yes. The NDR-240-24 is designed for TS35/7.5 and TS35/15 DIN rail mounting in industrial control cabinets. Ensure the unit is securely installed with adequate ventilation.
What if the power supply becomes hot inside the cabinet?
Check the cabinet temperature, load level, ventilation openings and installation clearance. The NDR-240-24 uses natural-convection cooling with a 50°C ambient full-load limit. Consult the derating curve for operation above 50°C.
What should I check if the 24V equipment repeatedly resets?
Measure the output voltage under load and inspect terminal tightness, cable voltage drop, total current demand and input voltage. Also check whether startup current or a faulty downstream device is causing the supply to enter a protection state.
What information should I provide when ordering the NDR-240-24?
Provide the required quantity, input supply voltage, total 24V load, installation conditions and any documentation or certification requirements. This helps confirm suitability for the intended control system.
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Overview
NDR-240-24 Overview
The DAPPRA NDR-240-24 (SKU: OF58) is a 240W single output slim industrial DIN rail power supply designed for medium-power industrial control, factory automation and electromechanical applications. It provides a stable 24V DC output at 10A rated current from a universal 90–264 VAC input or 127–370 VDC input, and includes built-in active PFC for improved power quality.
The unit features a 63 mm wide metal housing that enhances power dissipation, fanless natural convection cooling, and complete protection functions including short circuit, overload (constant current limiting, auto-recovery), over voltage (29–33V) and over temperature protection. Designed for TS35/7.5 or TS35/15 DIN rail mounting and certified to UL508, the NDR-240-24 delivers a reliable 88.5% efficiency 24V power solution for demanding industrial loads.
Key Features
NDR-240-24 Key Features
Engineered for medium-power, space-saving 24V industrial power supply applications.
- 240W Output · 24V / 10ASingle output configuration providing 24V DC nominal output at 10A rated current (0~10A current range) with 240W rated output power.
- Built-in Active PFCActive power factor correction with PF >0.98 at 115VAC and PF >0.95 at 230VAC under full load, reducing harmonic current and improving power quality.
- Universal AC Input 90–264 VACFull-range single-phase AC input supports global mains voltages. Also supports 127–370 VDC input (DC operation by connecting AC/L(+) and AC/N(−)).
- 24~28V Output AdjustmentFront-panel +V ADJ potentiometer allows the rated output voltage to be adjusted between 24V and 28V to suit the connected load.
- 88.5% Typical EfficiencyThe NDR-240-24 achieves 88.5% typical efficiency, balancing performance with manageable heat generation inside the control cabinet.
- Slim 63 mm Metal HousingThe 63 × 125.2 × 113.5 mm metal housing enhances power dissipation and saves DIN rail space inside control cabinets.
- Fanless Natural Convection CoolingNo fan means no dust intake, no acoustic noise and no moving parts — ideal for dusty industrial environments and silent operation.
- Complete Protection FunctionsShort circuit, overload (105–130% rated output power, constant current limiting, auto-recovery), over voltage (29–33V, shut down and re-power) and over temperature protection (auto-recovery after cooling) are built in.
- TS35 DIN Rail MountingDesigned for standard TS35/7.5 or TS35/15 DIN rail mounting inside electrical panels, control cabinets and automation equipment.
- UL508 & 3-Year WarrantyCertified to UL508 (industrial control equipment), TUV BS EN/EN62368-1 and EAC TP TC 004, and backed by a 3-year DAPPRA warranty.
Specifications
NDR-240-24 Specifications
Complete technical specifications for the NDR-240-24 industrial DIN rail power supply.
Output
| DC Output Voltage | 24V |
| Rated Current | 10A |
| Current Range | 0~10A |
| Rated Power | 240W |
| Ripple & Noise (max.) | 150mVp-p |
| Voltage Adjustment Range | 24~28V |
| Voltage Tolerance | ±1.0% |
| Line Regulation | ±0.5% |
| Load Regulation | ±1.0% |
| Setup, Rise Time | 1500ms, 100ms/230VAC · 3000ms, 100ms/115VAC at full load |
| Hold Up Time (Typ.) | 28ms/230VAC · 22ms/115VAC at full load |
Input
| Voltage Range | 90~264VAC · 127~370VDC |
| Frequency Range | 47~63Hz |
| Power Factor (Typ.) | PF >0.98/115VAC · PF >0.95/230VAC at full load |
| Efficiency (Typ.) | 88.5% |
| AC Current (Typ.) | 2.5A/115VAC · 1.3A/230VAC |
| Inrush Current (Typ.) | 20A/115VAC · 35A/230VAC |
| Leakage Current | <1mA/240VAC |
Protection
| Overload | 105~130% rated output power · Constant current limiting · Auto-recovery after fault removed |
| Over Voltage | 29~33V · Shut down output, re-power on to recover |
| Over Temperature | Shut down output; auto-recovery after temperature falls |
| Short Circuit | Protected |
Environment
| Working Temperature | −20 ~ +70°C (Refer to Derating Curve; full load up to 50°C) |
| Working Humidity | 20~95% RH non-condensing |
| Storage Temp., Humidity | −40 ~ +85°C, 10~95% RH |
| Temp. Coefficient | ±0.03%/°C (0~50°C) |
| Vibration | 10~500Hz, 2G 10min./1cycle, 60min. each along X, Y, Z axes |
Safety & EMC
| Safety Standards | UL508, TUV BS EN/EN62368-1, EAC TP TC 004; meets BS EN/EN60204-1 |
| Withstand Voltage | I/P-O/P: 3KVAC · I/P-FG: 2KVAC · O/P-FG: 0.5KVAC |
| Isolation Resistance | >100M Ohms / 500VDC / 25°C / 70% RH |
| EMC Emission | BS EN/EN55032 (CISPR32) Class B · BS EN/EN61000-3-2,-3 |
| EMC Immunity | BS EN/EN61000-4-2, 3, 4, 5, 6, 8, 11 · BS EN/EN61000-6-2 (BS EN/EN50082-2) heavy industry level |
Reliability & Dimensions
| MTBF | 1645.2K hrs min. Telcordia SR-332 (Bellcore) · 230.2K hrs min. MIL-HDBK-217F (25°C) |
| Dimensions (W×H×D) | 63 × 125.2 × 113.5 mm |
| Weight | 1.0 Kg |
| Packing | 1.0Kg; 12pcs/13Kg/1.1CUFT |
| Warranty | 3 Years |
Front Panel Controls
| +V ADJ | Output voltage adjustment potentiometer (24~28V) |
| DC OK | DC output OK indicator LED |
| Terminal TB1 | Input: FG / AC-N-DC− / AC-L-DC+ |
| Terminal TB2 | Output: −V (pins 1,2) / +V (pins 3,4) |
Notes
1. All parameters not specially mentioned are measured at 230VAC input, rated load and 25°C ambient temperature. 2. Ripple & noise are measured at 20MHz of bandwidth with a 12" twisted pair-wire terminated with a 0.1μF & 47μF parallel capacitor. 3. Tolerance includes set-up tolerance, line regulation and load regulation. 4. The power supply is considered a component to be installed into a final equipment; the final equipment must be re-confirmed to meet EMC directives. 5. Derating may be needed under low input voltage. 6. The NDR-240-24 includes built-in active PFC (PF >0.98/115VAC, >0.95/230VAC). 7. Full-load operation is specified up to 50°C ambient; refer to the derating curve for operation above 50°C. 8. Installation clearances: 40mm top, 20mm bottom, 5mm left/right; 15mm from adjacent heat sources.
Model Information
NDR-240-24 Model Code
The model number identifies the NDR Series, output wattage and output voltage. DAPPRA SKU for this model: OF58.
Model Code
NDR
-
240
-
24
NDRSeries prefix — DAPPRA NDR Series Slim DIN Rail Power Supply.
240 — Output WattageOutput power rating in Watts. This model provides 240W.
24 — Output VoltageNominal output voltage in VDC. This model provides 24V DC output.
Field
Meaning
Value
NDR
Series prefix
NDR
Output Wattage
Rated output power in Watts
240W
Output Voltage
Nominal DC output voltage
24V
Example: NDR-240-24 = NDR Series, 240W output power, 24V DC output voltage. DAPPRA SKU: OF58.
Dimensions
NDR-240-24 Dimensions
Slim 63 mm metal housing with a compact footprint designed for space-constrained control cabinets. All dimensions in mm, tolerance ±1 mm.
Mechanical Dimensions
| Width (W) | 63 mm |
| Height (H) | 125.2 mm |
| Depth (D) | 113.5 mm |
| DIN Rail Slot to Top (S) | 35 mm |
| Weight | 1.0 Kg |
| 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
NDR-240-24 Installation
The NDR-240-24 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 NDR-240-24 operates from −20°C to +70°C, with full-load operation specified up to 50°C ambient. Refer to the derating curve for operation above 50°C.
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
NDR-240-24 Wiring & Terminal
The NDR-240-24 uses two terminal blocks: TB1 for input and TB2 for output. Use copper wire only and ensure all strands of each stranded wire enter the terminal connection and the screw terminals are securely fixed to prevent poor contact.
Terminal Pin Assignment
TB1 — Input Terminal
| Pin No. | Assignment |
|---|---|
| 1 | FG (Frame Ground) |
| 2 | AC/N or DC− |
| 3 | AC/L or DC+ |
TB2 — Output Terminal
| Pin No. | Assignment |
|---|---|
| 1, 2 | DC OUTPUT −V |
| 3, 4 | DC OUTPUT +V |
The FG pin must be connected to PE (Protective Earth). Both −V pins (1, 2) and both +V pins (3, 4) should be connected to their respective output wires to prevent excessive current stress on a single contact. DC input operation is possible by connecting AC/L(+), AC/N(−).
Wiring Specification
Recommended Wire
| AWG | Rated Current | Cross-section |
|---|---|---|
| 18 | 7 A | 0.8 mm² |
| 16 | 10 A | 1.3 mm² |
| 14 | 15 A | 2.1 mm² |
| 12 | 20 A | 3.3 mm² |
Current each wire carries should be de-rated to 80% of the current suggested above when using 5 or more wires connected to the unit. Use wires that can withstand temperatures of at least 80°C, such as UL1007.
Terminal Torque Setting
| Model | I/P | O/P |
|---|---|---|
| NDR-240 | 7.5 kgf-cm (6.5 Lb-in) | 7.5 kgf-cm (6.5 Lb-in) |
Recommended wire strapping length: 5 mm (0.197"). Recommended screwdriver: 3 mm, slotted type.
Fuse & Circuit Breaker (230V)
| Model | Fuse | C16 | D16 |
|---|---|---|---|
| NDR-240 | T5A/L250V | 4 | 10 |
Maximum number of NDR-240 PSUs that can be connected to a circuit breaker at 230V. For continued protection against risk of fire, replace only with the same type and rating of fuse.
DC Output Voltage Adjustment
The NDR-240-24 includes a front-panel DC output voltage adjustment potentiometer (+V ADJ) and a DC OK indicator LED. The rated output voltage can be adjusted between 24V and 28V via the front-panel adjuster. Output current and output wattage must not exceed the rated value on its specification.
Safety & Compliance
NDR-240-24 Safety & Cautions
Read and follow all safety instructions before installing, wiring, maintaining or modifying the NDR-240-24 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 value on its specification.
- Before commencing any installation, maintenance or modification work, disconnect the system from supply voltage. Make sure that inadvertent connection in circuit will be impossible.
- For continued protection against risk of fire, replace only with the same type and rating of fuse.
- 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
NDR-240-24 Industrial Applications
The NDR-240-24 is suitable for medium-power industrial control systems, factory automation equipment, electromechanical apparatus, electrical panels and semiconductor manufacturing equipment.
Industrial Control Systems
Factory Automation
Electromechanical Apparatus
Electrical Panels
Semiconductor Equipment
Machine Control
Process Control
Test & Measurement
Building Automation
PLC & Sensor Power
Industrial LED Lighting
Security & Access Control
Next Step
Need the NDR-240-24 for Your Application?
Contact DAPPRA Automation for product specifications, installation support, technical documentation and purchasing assistance — or explore the full NDR Series and industrial power supply range.
Support
NDR-240-24 FAQ
What is the DAPPRA NDR-240-24 power supply?
The DAPPRA NDR-240-24 (SKU: OF58) is a 240W industrial DIN rail power supply that delivers 24V DC at a rated current of 10A. It is designed for compatible industrial control panels and automation equipment.
What is the maximum rated output of the NDR-240-24?
The NDR-240-24 provides 24V DC, up to 10A, with a rated output power of 240W. The combined load should remain within these ratings under the actual operating conditions.
Can the NDR-240-24 power a PLC, HMI and sensors from one supply?
Yes, provided the connected devices all accept 24V DC and their combined steady-state and startup current stays within the power supply's capacity. Check each device's electrical specifications and account for any inductive loads.
What is the output voltage adjustment range of the NDR-240-24?
The NDR-240-24 has an adjustable output range of 24–28V DC using the front-panel +V ADJ control. Before increasing the voltage, confirm that every connected device can tolerate the selected voltage.
What AC input range does the NDR-240-24 support?
The NDR-240-24 supports a universal AC input range of 90–264VAC (47–63Hz) and a DC input range of 127–370VDC. DC input operation is possible by connecting AC/L(+) and AC/N(−).
Does the NDR-240-24 have active PFC?
Yes. The NDR-240-24 includes built-in active power factor correction (PFC), with a typical power factor greater than 0.98 at 115VAC and greater than 0.95 at 230VAC under full load.
How can I tell whether the DC output of the NDR-240-24 is operating normally?
The front panel has a DC OK indicator. Check the indicator together with a voltage measurement at the output terminals and, if necessary, at the connected load.
Is 240W enough for a control cabinet with multiple 24V devices?
It depends on the total load. Add the rated power consumption of the PLC, HMI, sensors, relays, valves and other connected devices, then allow additional capacity for startup current and future expansion.
Can the NDR-240-24 drive motors directly?
Do not assume it can drive a motor directly. Check the motor's voltage, current, startup demand and drive requirements. A motor requiring a dedicated driver or controller should be connected through compatible equipment.
What should I consider when wiring several loads to the 24V output of the NDR-240-24?
Use appropriately rated conductors and terminals, observe positive and negative polarity, and consider the current carried by each branch. Separate branch protection may be needed depending on the equipment and applicable electrical standards.
How does cable length affect a 24V DC installation?
Long cables can cause voltage drop, especially when loads draw substantial current. Select the wire size based on current, cable length and acceptable voltage drop, and measure voltage at the load during operation.
Can the NDR-240-24 be mounted on a standard DIN rail?
Yes. The NDR-240-24 is designed for TS35/7.5 and TS35/15 DIN rail mounting in industrial control cabinets. Ensure the unit is securely installed with adequate ventilation.
What if the power supply becomes hot inside the cabinet?
Check the cabinet temperature, load level, ventilation openings and installation clearance. The NDR-240-24 uses natural-convection cooling with a 50°C ambient full-load limit. Consult the derating curve for operation above 50°C.
What should I check if the 24V equipment repeatedly resets?
Measure the output voltage under load and inspect terminal tightness, cable voltage drop, total current demand and input voltage. Also check whether startup current or a faulty downstream device is causing the supply to enter a protection state.
What information should I provide when ordering the NDR-240-24?
Provide the required quantity, input supply voltage, total 24V load, installation conditions and any documentation or certification requirements. This helps confirm suitability for the intended control system.
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