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NDR-240-48 240W 48V 5A Industrial DIN Rail Power Supply
Rp850,000.00
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DAPPRA NDR-240-48 (SKU: OF63) is a 240W single output slim industrial DIN rail power supply with 48V DC / 5A output and universal 90–264 VAC input. Built-in active PFC, 90% 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-240-48 Overview
The DAPPRA NDR-240-48 (SKU: OF63) 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 48V DC output at 5A 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 (56–65V) and over temperature protection. Designed for TS35/7.5 or TS35/15 DIN rail mounting and certified to UL508, the NDR-240-48 delivers a high-efficiency 90% 48V power solution for demanding industrial loads.
Key Features
NDR-240-48 Key Features
Engineered for medium-power, space-saving 48V industrial power supply applications.
- 240W Output · 48V / 5ASingle output configuration providing 48V DC nominal output at 5A rated current (0~5A 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(−)).
- 48~55V Output AdjustmentFront-panel +V ADJ potentiometer allows the rated output voltage to be adjusted between 48V and 55V to suit the connected load.
- 90% Typical EfficiencyThe NDR-240-48 achieves 90% typical efficiency, minimizing energy consumption and 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 (56–65V, shut down and re-power) and over temperature protection 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-240-48 Specifications
Complete technical specifications for the NDR-240-48 industrial DIN rail power supply.
Output
| DC Output Voltage | 48V |
| Rated Current | 5A |
| Current Range | 0~5A |
| Rated Power | 240W |
| Ripple & Noise (max.) | 150mVp-p |
| Voltage Adjustment Range | 48~55V |
| 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.) | 90% |
| AC Current (Typ.) | 1.4A/115VAC · 0.6A/230VAC · 0.55A/277VAC |
| 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 | 56~65V · 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 (Full load up to 40°C, derating 2.5%/°C above) |
| 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 |
| 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 (48~55V) |
| 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-240-48 includes built-in active PFC (PF >0.98/115VAC, >0.95/230VAC). 7. Full-load operation is specified up to 40°C ambient; derating of 2.5%/°C is required above 40°C according to the derating curve.
Model Information
NDR-240-48 Model Code
The model number identifies the NDR Series, output wattage and output voltage. DAPPRA SKU for this model: OF63.
Model Code
NDR
-
240
-
48
NDRSeries prefix — DAPPRA NDR Series Slim DIN Rail Power Supply.
240 — Output WattageOutput power rating in Watts. This model provides 240W.
48 — Output VoltageNominal output voltage in VDC. This model provides 48V DC output.
Field
Meaning
Value
NDR
Series prefix
NDR
Output Wattage
Rated output power in Watts
240W
Output Voltage
Nominal DC output voltage
48V
Example: NDR-240-48 = NDR Series, 240W output power, 48V DC output voltage. DAPPRA SKU: OF63.
Dimensions
NDR-240-48 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-240-48 Installation
The NDR-240-48 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-240-48 operates from −20°C to +70°C, with full-load operation specified up to 40°C ambient. Load derating of 2.5%/°C is required above 40°C according to the derating curve.
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-240-48 Wiring & Terminal
The NDR-240-48 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-240-48 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 48V and 55V via the front-panel adjuster. Output current and output wattage must not exceed the rated value on its specification.
Safety & Compliance
NDR-240-48 Safety & Cautions
Read and follow all safety instructions before installing, wiring, maintaining or modifying the NDR-240-48 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-240-48 Industrial Applications
The NDR-240-48 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-240-48 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-240-48 FAQ
What applications are suitable for the DAPPRA NDR-240-48?
The DAPPRA NDR-240-48 (SKU: OF63) is a 240W industrial DIN rail power supply designed to provide 48V DC at up to 5A. It can be considered for compatible industrial control systems, 48V equipment, and automation installations that require a medium-power DC supply.
Can the NDR-240-48 supply a 48V load drawing 5A continuously?
A 5A load at 48V requires 240W, which equals the unit's nominal rated output. Continuous operation at full load is specified up to 40°C ambient, with derating required above 40°C. Verify ambient temperature and installation conditions before planning continuous full-load operation.
How much power remains available when the connected equipment consumes 180W on the NDR-240-48?
At a nominal rated output of 240W, a 180W load leaves a theoretical capacity margin of 60W. Actual system planning should also account for startup demand, temperature-related derating, and the requirements of the connected equipment.
Can the NDR-240-48 power several 48V devices from one unit?
Yes, if all devices accept the supply's output voltage and their combined load remains within the available current (5A) and power (240W) limits. Check the total steady-state current, startup requirements, and the suitability of the distribution wiring.
What is the advantage of choosing 48V instead of 24V for a comparable power load?
For the same power, a 48V system generally requires less current than a 24V system. This can reduce current-related cable losses and help with power distribution, although equipment voltage compatibility and applicable electrical safety requirements must still be considered.
Does the NDR-240-48 support active power factor correction?
Yes. The NDR-240-48 includes built-in active power factor correction (PFC). The power factor is greater than 0.98 at 115VAC and greater than 0.95 at 230VAC under full load.
How efficient is the NDR-240-48?
The NDR-240-48 has a typical efficiency of 90%. Actual efficiency depends on input voltage and load conditions.
Can the output voltage of the NDR-240-48 be adjusted?
Yes. The front-panel +V ADJ potentiometer allows the output voltage to be adjusted from 48V to 55V DC. Ensure that any adjustment remains within the connected equipment's permitted input range.
What should be checked when sizing cables for a 5A, 48V DC output?
Cable selection should consider the continuous current, cable length, conductor size, insulation temperature rating, installation method, and allowable voltage drop. Use appropriately rated conductors and protective devices, and follow applicable electrical codes.
Does the NDR-240-48 need forced-air cooling?
No. The NDR-240-48 uses fanless natural-convection cooling. Allow sufficient airflow around the metal housing and follow the installation clearances and derating curve in the product documentation, especially in a densely packed control cabinet.
Can the NDR-240-48 operate in a hot industrial control cabinet?
The NDR-240-48 operates between −20°C and +70°C. Full-load operation is specified up to 40°C ambient, with derating of 2.5% per °C required above 40°C according to the derating curve.
What should I know before wiring the NDR-240-48 output terminals?
For the NDR-240-48, TB2 pins 1 and 2 are negative output (−V), while pins 3 and 4 are positive output (+V). Always verify the physical terminal markings and the exact model wiring diagram before connecting the load.
What happens if the NDR-240-48 is overloaded?
The NDR-240-48 includes overload protection rated at 105–130% of rated output power, using constant-current limiting. The unit recovers automatically after the fault condition is removed.
Can the NDR-240-48 replace a 48V power supply with a lower current rating?
It may be suitable if the existing system requires 48V DC and the NDR-240-48's input, output, protection, mounting, and wiring requirements are compatible. A higher current rating does not force equipment to draw more current, but the output voltage and system protection must be appropriate for the connected load.
What information should I provide when requesting a quotation for the NDR-240-48?
Provide the required 48V load current or power, input supply voltage, operating temperature, installation environment, and quantity required. If replacing an existing unit, include its model number and wiring details so DAPPRA can help check compatibility.
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Overview
NDR-240-48 Overview
The DAPPRA NDR-240-48 (SKU: OF63) 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 48V DC output at 5A 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 (56–65V) and over temperature protection. Designed for TS35/7.5 or TS35/15 DIN rail mounting and certified to UL508, the NDR-240-48 delivers a high-efficiency 90% 48V power solution for demanding industrial loads.
Key Features
NDR-240-48 Key Features
Engineered for medium-power, space-saving 48V industrial power supply applications.
- 240W Output · 48V / 5ASingle output configuration providing 48V DC nominal output at 5A rated current (0~5A 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(−)).
- 48~55V Output AdjustmentFront-panel +V ADJ potentiometer allows the rated output voltage to be adjusted between 48V and 55V to suit the connected load.
- 90% Typical EfficiencyThe NDR-240-48 achieves 90% typical efficiency, minimizing energy consumption and 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 (56–65V, shut down and re-power) and over temperature protection 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-240-48 Specifications
Complete technical specifications for the NDR-240-48 industrial DIN rail power supply.
Output
| DC Output Voltage | 48V |
| Rated Current | 5A |
| Current Range | 0~5A |
| Rated Power | 240W |
| Ripple & Noise (max.) | 150mVp-p |
| Voltage Adjustment Range | 48~55V |
| 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.) | 90% |
| AC Current (Typ.) | 1.4A/115VAC · 0.6A/230VAC · 0.55A/277VAC |
| 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 | 56~65V · 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 (Full load up to 40°C, derating 2.5%/°C above) |
| 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 |
| 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 (48~55V) |
| 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-240-48 includes built-in active PFC (PF >0.98/115VAC, >0.95/230VAC). 7. Full-load operation is specified up to 40°C ambient; derating of 2.5%/°C is required above 40°C according to the derating curve.
Model Information
NDR-240-48 Model Code
The model number identifies the NDR Series, output wattage and output voltage. DAPPRA SKU for this model: OF63.
Model Code
NDR
-
240
-
48
NDRSeries prefix — DAPPRA NDR Series Slim DIN Rail Power Supply.
240 — Output WattageOutput power rating in Watts. This model provides 240W.
48 — Output VoltageNominal output voltage in VDC. This model provides 48V DC output.
Field
Meaning
Value
NDR
Series prefix
NDR
Output Wattage
Rated output power in Watts
240W
Output Voltage
Nominal DC output voltage
48V
Example: NDR-240-48 = NDR Series, 240W output power, 48V DC output voltage. DAPPRA SKU: OF63.
Dimensions
NDR-240-48 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-240-48 Installation
The NDR-240-48 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-240-48 operates from −20°C to +70°C, with full-load operation specified up to 40°C ambient. Load derating of 2.5%/°C is required above 40°C according to the derating curve.
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-240-48 Wiring & Terminal
The NDR-240-48 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-240-48 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 48V and 55V via the front-panel adjuster. Output current and output wattage must not exceed the rated value on its specification.
Safety & Compliance
NDR-240-48 Safety & Cautions
Read and follow all safety instructions before installing, wiring, maintaining or modifying the NDR-240-48 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-240-48 Industrial Applications
The NDR-240-48 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-240-48 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-240-48 FAQ
What applications are suitable for the DAPPRA NDR-240-48?
The DAPPRA NDR-240-48 (SKU: OF63) is a 240W industrial DIN rail power supply designed to provide 48V DC at up to 5A. It can be considered for compatible industrial control systems, 48V equipment, and automation installations that require a medium-power DC supply.
Can the NDR-240-48 supply a 48V load drawing 5A continuously?
A 5A load at 48V requires 240W, which equals the unit's nominal rated output. Continuous operation at full load is specified up to 40°C ambient, with derating required above 40°C. Verify ambient temperature and installation conditions before planning continuous full-load operation.
How much power remains available when the connected equipment consumes 180W on the NDR-240-48?
At a nominal rated output of 240W, a 180W load leaves a theoretical capacity margin of 60W. Actual system planning should also account for startup demand, temperature-related derating, and the requirements of the connected equipment.
Can the NDR-240-48 power several 48V devices from one unit?
Yes, if all devices accept the supply's output voltage and their combined load remains within the available current (5A) and power (240W) limits. Check the total steady-state current, startup requirements, and the suitability of the distribution wiring.
What is the advantage of choosing 48V instead of 24V for a comparable power load?
For the same power, a 48V system generally requires less current than a 24V system. This can reduce current-related cable losses and help with power distribution, although equipment voltage compatibility and applicable electrical safety requirements must still be considered.
Does the NDR-240-48 support active power factor correction?
Yes. The NDR-240-48 includes built-in active power factor correction (PFC). The power factor is greater than 0.98 at 115VAC and greater than 0.95 at 230VAC under full load.
How efficient is the NDR-240-48?
The NDR-240-48 has a typical efficiency of 90%. Actual efficiency depends on input voltage and load conditions.
Can the output voltage of the NDR-240-48 be adjusted?
Yes. The front-panel +V ADJ potentiometer allows the output voltage to be adjusted from 48V to 55V DC. Ensure that any adjustment remains within the connected equipment's permitted input range.
What should be checked when sizing cables for a 5A, 48V DC output?
Cable selection should consider the continuous current, cable length, conductor size, insulation temperature rating, installation method, and allowable voltage drop. Use appropriately rated conductors and protective devices, and follow applicable electrical codes.
Does the NDR-240-48 need forced-air cooling?
No. The NDR-240-48 uses fanless natural-convection cooling. Allow sufficient airflow around the metal housing and follow the installation clearances and derating curve in the product documentation, especially in a densely packed control cabinet.
Can the NDR-240-48 operate in a hot industrial control cabinet?
The NDR-240-48 operates between −20°C and +70°C. Full-load operation is specified up to 40°C ambient, with derating of 2.5% per °C required above 40°C according to the derating curve.
What should I know before wiring the NDR-240-48 output terminals?
For the NDR-240-48, TB2 pins 1 and 2 are negative output (−V), while pins 3 and 4 are positive output (+V). Always verify the physical terminal markings and the exact model wiring diagram before connecting the load.
What happens if the NDR-240-48 is overloaded?
The NDR-240-48 includes overload protection rated at 105–130% of rated output power, using constant-current limiting. The unit recovers automatically after the fault condition is removed.
Can the NDR-240-48 replace a 48V power supply with a lower current rating?
It may be suitable if the existing system requires 48V DC and the NDR-240-48's input, output, protection, mounting, and wiring requirements are compatible. A higher current rating does not force equipment to draw more current, but the output voltage and system protection must be appropriate for the connected load.
What information should I provide when requesting a quotation for the NDR-240-48?
Provide the required 48V load current or power, input supply voltage, operating temperature, installation environment, and quantity required. If replacing an existing unit, include its model number and wiring details so DAPPRA can help check compatibility.
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