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NDR-75-48 48V 75W slim single output industrial DIN rail power supply
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DAPPRA NDR-75-48 (SKU: OF51) is a 75W single output ultra-slim industrial DIN rail power supply with 48V DC / 1.6A output and universal 90–264 VAC input. 89% typical efficiency, ultra-slim 32 mm metal housing, fanless natural convection cooling, complete protection functions, UL508 approved, TS35 DIN rail mounting, 3-year warranty — ideal for industrial control, factory automation and electrical panels.
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Overview
NDR-75-48 Overview
The DAPPRA NDR-75-48 (SKU: OF51) is a 75W single output slim industrial DIN rail power supply designed for compact industrial control, factory automation and electromechanical applications. It provides a stable 48V DC output at 1.6A rated current from a universal 90–264 VAC input or 127–370 VDC input.
The unit features an ultra-slim 32 mm wide metal housing — the narrowest in the NDR Series — that enhances power dissipation while minimizing DIN rail footprint. It offers fanless natural convection cooling, high 89% typical efficiency, and complete protection functions including short circuit, overload (constant current limiting), 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-75-48 is an economical, space-saving 48V power solution for space-constrained control cabinets.
Key Features
NDR-75-48 Key Features
Engineered for economical, ultra-compact 48V industrial power supply applications.
- 76.8W Output · 48V / 1.6ASingle output configuration providing 48V DC nominal output at 1.6A rated current (0~1.6A current range) with 76.8W rated output power.
- Universal AC Input 90–264 VACFull-range single-phase AC input supports global mains voltages without external selection switches. Also supports 127–370 VDC input (DC input operation possible 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.
- 89% Typical EfficiencyThe NDR-75-48 achieves 89% typical efficiency — the highest in the NDR-75 Series — reducing energy consumption and heat generation.
- Ultra-Slim 32 mm Metal HousingThe 32 × 125.2 × 102 mm metal housing is the narrowest in the NDR Series, saving valuable DIN rail space in compact 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 protection, overload protection (105–130% rated output power, constant current limiting, auto-recovery), over voltage protection (56–65V) 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 & Industrial Immunity ApprovedCertified to UL508, TUV BS EN/EN62368-1 and EAC TP TC 004, and complies with BS EN/EN61000-6-2 (BS EN/EN50082-2) industrial immunity level.
- 3-Year WarrantyEach NDR-75-48 unit is backed by a 3-year DAPPRA warranty for long-term operational confidence.
Specifications
NDR-75-48 Specifications
Complete technical specifications for the NDR-75-48 industrial DIN rail power supply.
Output
| DC Output Voltage | 48V |
| Rated Current | 1.6A |
| Current Range | 0~1.6A |
| Rated Power | 76.8W |
| 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 | 1200ms, 60ms/230VAC · 2000ms, 60ms/115VAC at full load |
| Hold Up Time (Typ.) | 60ms/230VAC · 12ms/115VAC at full load |
Input
| Voltage Range | 90~264VAC · 127~370VDC |
| Frequency Range | 47~63Hz |
| Efficiency (Typ.) | 89% |
| AC Current (Typ.) | 1.45A/115VAC · 0.9A/230VAC |
| Inrush Current (Typ.) | 20A/115VAC · 35A/230VAC |
| Leakage Current | <1mA/240VAC |
Protection
| Overload | 105~130% rated output power · Constant current limiting · Auto-recovery |
| Over Voltage | 56~65V · Shut down output, re-power on to recover |
| Over Temperature | Shut down output voltage; re-power on to recover |
| Short Circuit | Protected |
Environment
| Working Temperature | −20 ~ +70°C (Derating above 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 | 2757.3K hrs min. Telcordia SR-332 (Bellcore) · 486.2K hrs min. MIL-HDBK-217F (25°C) |
| Dimensions (W×H×D) | 32 × 125.2 × 102 mm |
| Weight | 0.51 Kg |
| Packing | 0.51Kg; 28pcs/15.3Kg/1.22CUFT |
| 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. Built-in active PFC is available on NDR-240 and NDR-480 models only; the NDR-75-48 does not include active PFC. 7. The NDR-75-48 has a full-load ambient limit of 50°C — refer to the derating curve.
Model Information
NDR-75-48 Model Code
The model number identifies the NDR Series, output wattage and output voltage. DAPPRA SKU for this model: OF51.
Model Code
NDR
-
75
-
48
NDRSeries prefix — DAPPRA NDR Series Slim DIN Rail Power Supply.
75 — Output WattageOutput power rating in Watts. This model provides 76.8W at 48V / 1.6A.
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
76.8W
Output Voltage
Nominal DC output voltage
48V
Example: NDR-75-48 = NDR Series, 75W class, 48V DC output. Actual rated power: 76.8W (48V × 1.6A). DAPPRA SKU: OF51.
Dimensions
NDR-75-48 Dimensions
Ultra-slim 32 mm metal housing — the narrowest in the NDR Series — designed for space-constrained control cabinets. All dimensions in mm, tolerance ±1 mm.
Mechanical Dimensions
| Width (W) | 32 mm |
| Height (H) | 125.2 mm |
| Depth (D) | 102 mm |
| DIN Rail Slot to Top (S) | 35 mm |
| Weight | 0.51 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-75-48 Installation
The NDR-75-48 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-75-48 operates from −20°C to +70°C, with full-load operation specified up to 50°C ambient. Load derating is required above 50°C according to the derating curve. Do not install in high ambient temperature locations or near fire sources.
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-75-48 Wiring & Terminal
The NDR-75-48 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-75 | 6.9 kgf-cm (6 Lb-in) | 6.9 kgf-cm (6 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-75 | T3.15A/L250V | 6 | 13 |
Maximum number of NDR-75 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-75-48 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-75-48 Safety & Cautions
Read and follow all safety instructions before installing, wiring, maintaining or modifying the NDR-75-48 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-75-48 Industrial Applications
The NDR-75-48 is suitable for compact industrial control systems, factory automation equipment, electromechanical apparatus, electrical panels and sensor power circuits.
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-75-48 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-75-48 FAQ
What are the output specifications of the DAPPRA NDR-75-48?
The DAPPRA NDR-75-48 is a 75W industrial DIN rail power supply with a nominal 48V DC output and a rated current of 1.6A. It is intended for equipment requiring a compatible 48V DC power source. The connected load must remain within the rated output power and current.
Is the NDR-75-48 suitable for 48V industrial control equipment?
It can be considered for industrial control equipment that requires a compatible 48V DC supply. Before purchasing, check the equipment's required voltage, operating current, startup demand, and polarity to ensure compatibility.
How much load can the NDR-75-48 support?
The rated output is 75W at 48V DC, with a maximum rated current of 1.6A. To estimate the available capacity, add the power consumption of all connected devices and ensure the total remains within the power supply's ratings. Allow additional margin where startup loads or changing operating conditions are expected.
Can the NDR-75-48 power multiple devices at the same time?
Yes, multiple compatible devices may share the supply if their combined current and power requirements stay within the rated limits. Check each device's voltage requirement and startup current, and ensure that the wiring and distribution terminals are suitable for the total load.
What input voltage does the NDR-75-48 support?
The NDR-75-48 supports a universal AC input range of 90–264VAC and a DC input range of 127–370VDC. DC input operation is possible by connecting AC/L(+) and AC/N(−). Confirm these input ratings against the latest NDR-75-48 datasheet before connecting a DC source.
Is the NDR-75-48 a good choice when a machine requires 48V instead of 24V?
It may be suitable when the machine specifically requires 48V DC and its total power demand does not exceed 75W. A 48V supply must not be connected directly to equipment designed only for 24V. Verify the required voltage of every connected device before installation.
Can the NDR-75-48 replace an existing 48V power supply?
It may be a suitable replacement if the original unit's input range, 48V output, current capacity, power rating, mounting arrangement, and terminal connections are compatible. Compare the existing power supply's nameplate and installation requirements before replacing it.
Does the NDR-75-48 require a cooling fan?
The NDR Series uses fanless natural convection cooling. Provide sufficient airflow around the unit and follow the installation instructions for mounting orientation and clearance. Avoid enclosing the power supply in a space where heat cannot dissipate adequately.
What protection functions are available on the NDR Series?
The NDR Series documentation lists short-circuit, overload, overvoltage, and overtemperature protection. These functions help protect the power supply and connected equipment under abnormal operating conditions. Refer to the NDR-75-48 datasheet for the model-specific protection thresholds and recovery behavior.
Can the NDR-75-48 be installed on a standard DIN rail?
The NDR Series supports TS35/7.5 and TS35/15 DIN rail mounting. Check the NDR-75-48 product drawing and installation instructions to confirm the mounting arrangement and required clearance for your control cabinet.
Is the NDR-75-48 suitable for a compact electrical control cabinet?
The NDR-75 series is listed with a slim 32mm housing width, which can help save DIN rail space. Before installation, check the full dimensions, terminal access, cable bending space, and ventilation requirements against the available cabinet space.
What should I check before connecting equipment to a 48V DC power supply?
Check the equipment's nominal voltage, maximum current, polarity, startup demand, and total power consumption. Also verify the wiring gauge, terminal connections, grounding, and applicable installation requirements. Disconnect the input supply before carrying out wiring or maintenance.
Is the NDR-75-48 suitable for continuous industrial operation?
It is designed for industrial power supply applications, including industrial control and factory automation. Reliable operation depends on the actual load, ambient temperature, ventilation, mounting, and installation conditions. Check the model-specific temperature and load-derating specifications before planning continuous full-load operation.
Does the NDR-75-48 have active power factor correction (PFC)?
No. The NDR-75-48 does not have built-in active power factor correction (PFC). Within the NDR Series, active PFC is available only on the NDR-240 and NDR-480 models. The NDR-75-48 meets BS EN/EN61000-3-2 harmonic current requirements without active PFC. Check the model-specific datasheet or contact DAPPRA before selecting it for an application with a specific power-factor or harmonic-current requirement.
How can I confirm the NDR-75-48 is suitable for my application and request a quotation?
Provide the required quantity, input voltage, connected equipment details, expected load, and delivery destination. DAPPRA can help you check model compatibility and confirm the applicable datasheet, certifications, availability, lead time, and warranty terms before ordering.
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Overview
NDR-75-48 Overview
The DAPPRA NDR-75-48 (SKU: OF51) is a 75W single output slim industrial DIN rail power supply designed for compact industrial control, factory automation and electromechanical applications. It provides a stable 48V DC output at 1.6A rated current from a universal 90–264 VAC input or 127–370 VDC input.
The unit features an ultra-slim 32 mm wide metal housing — the narrowest in the NDR Series — that enhances power dissipation while minimizing DIN rail footprint. It offers fanless natural convection cooling, high 89% typical efficiency, and complete protection functions including short circuit, overload (constant current limiting), 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-75-48 is an economical, space-saving 48V power solution for space-constrained control cabinets.
Key Features
NDR-75-48 Key Features
Engineered for economical, ultra-compact 48V industrial power supply applications.
- 76.8W Output · 48V / 1.6ASingle output configuration providing 48V DC nominal output at 1.6A rated current (0~1.6A current range) with 76.8W rated output power.
- Universal AC Input 90–264 VACFull-range single-phase AC input supports global mains voltages without external selection switches. Also supports 127–370 VDC input (DC input operation possible 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.
- 89% Typical EfficiencyThe NDR-75-48 achieves 89% typical efficiency — the highest in the NDR-75 Series — reducing energy consumption and heat generation.
- Ultra-Slim 32 mm Metal HousingThe 32 × 125.2 × 102 mm metal housing is the narrowest in the NDR Series, saving valuable DIN rail space in compact 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 protection, overload protection (105–130% rated output power, constant current limiting, auto-recovery), over voltage protection (56–65V) 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 & Industrial Immunity ApprovedCertified to UL508, TUV BS EN/EN62368-1 and EAC TP TC 004, and complies with BS EN/EN61000-6-2 (BS EN/EN50082-2) industrial immunity level.
- 3-Year WarrantyEach NDR-75-48 unit is backed by a 3-year DAPPRA warranty for long-term operational confidence.
Specifications
NDR-75-48 Specifications
Complete technical specifications for the NDR-75-48 industrial DIN rail power supply.
Output
| DC Output Voltage | 48V |
| Rated Current | 1.6A |
| Current Range | 0~1.6A |
| Rated Power | 76.8W |
| 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 | 1200ms, 60ms/230VAC · 2000ms, 60ms/115VAC at full load |
| Hold Up Time (Typ.) | 60ms/230VAC · 12ms/115VAC at full load |
Input
| Voltage Range | 90~264VAC · 127~370VDC |
| Frequency Range | 47~63Hz |
| Efficiency (Typ.) | 89% |
| AC Current (Typ.) | 1.45A/115VAC · 0.9A/230VAC |
| Inrush Current (Typ.) | 20A/115VAC · 35A/230VAC |
| Leakage Current | <1mA/240VAC |
Protection
| Overload | 105~130% rated output power · Constant current limiting · Auto-recovery |
| Over Voltage | 56~65V · Shut down output, re-power on to recover |
| Over Temperature | Shut down output voltage; re-power on to recover |
| Short Circuit | Protected |
Environment
| Working Temperature | −20 ~ +70°C (Derating above 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 | 2757.3K hrs min. Telcordia SR-332 (Bellcore) · 486.2K hrs min. MIL-HDBK-217F (25°C) |
| Dimensions (W×H×D) | 32 × 125.2 × 102 mm |
| Weight | 0.51 Kg |
| Packing | 0.51Kg; 28pcs/15.3Kg/1.22CUFT |
| 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. Built-in active PFC is available on NDR-240 and NDR-480 models only; the NDR-75-48 does not include active PFC. 7. The NDR-75-48 has a full-load ambient limit of 50°C — refer to the derating curve.
Model Information
NDR-75-48 Model Code
The model number identifies the NDR Series, output wattage and output voltage. DAPPRA SKU for this model: OF51.
Model Code
NDR
-
75
-
48
NDRSeries prefix — DAPPRA NDR Series Slim DIN Rail Power Supply.
75 — Output WattageOutput power rating in Watts. This model provides 76.8W at 48V / 1.6A.
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
76.8W
Output Voltage
Nominal DC output voltage
48V
Example: NDR-75-48 = NDR Series, 75W class, 48V DC output. Actual rated power: 76.8W (48V × 1.6A). DAPPRA SKU: OF51.
Dimensions
NDR-75-48 Dimensions
Ultra-slim 32 mm metal housing — the narrowest in the NDR Series — designed for space-constrained control cabinets. All dimensions in mm, tolerance ±1 mm.
Mechanical Dimensions
| Width (W) | 32 mm |
| Height (H) | 125.2 mm |
| Depth (D) | 102 mm |
| DIN Rail Slot to Top (S) | 35 mm |
| Weight | 0.51 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-75-48 Installation
The NDR-75-48 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-75-48 operates from −20°C to +70°C, with full-load operation specified up to 50°C ambient. Load derating is required above 50°C according to the derating curve. Do not install in high ambient temperature locations or near fire sources.
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-75-48 Wiring & Terminal
The NDR-75-48 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-75 | 6.9 kgf-cm (6 Lb-in) | 6.9 kgf-cm (6 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-75 | T3.15A/L250V | 6 | 13 |
Maximum number of NDR-75 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-75-48 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-75-48 Safety & Cautions
Read and follow all safety instructions before installing, wiring, maintaining or modifying the NDR-75-48 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-75-48 Industrial Applications
The NDR-75-48 is suitable for compact industrial control systems, factory automation equipment, electromechanical apparatus, electrical panels and sensor power circuits.
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-75-48 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-75-48 FAQ
What are the output specifications of the DAPPRA NDR-75-48?
The DAPPRA NDR-75-48 is a 75W industrial DIN rail power supply with a nominal 48V DC output and a rated current of 1.6A. It is intended for equipment requiring a compatible 48V DC power source. The connected load must remain within the rated output power and current.
Is the NDR-75-48 suitable for 48V industrial control equipment?
It can be considered for industrial control equipment that requires a compatible 48V DC supply. Before purchasing, check the equipment's required voltage, operating current, startup demand, and polarity to ensure compatibility.
How much load can the NDR-75-48 support?
The rated output is 75W at 48V DC, with a maximum rated current of 1.6A. To estimate the available capacity, add the power consumption of all connected devices and ensure the total remains within the power supply's ratings. Allow additional margin where startup loads or changing operating conditions are expected.
Can the NDR-75-48 power multiple devices at the same time?
Yes, multiple compatible devices may share the supply if their combined current and power requirements stay within the rated limits. Check each device's voltage requirement and startup current, and ensure that the wiring and distribution terminals are suitable for the total load.
What input voltage does the NDR-75-48 support?
The NDR-75-48 supports a universal AC input range of 90–264VAC and a DC input range of 127–370VDC. DC input operation is possible by connecting AC/L(+) and AC/N(−). Confirm these input ratings against the latest NDR-75-48 datasheet before connecting a DC source.
Is the NDR-75-48 a good choice when a machine requires 48V instead of 24V?
It may be suitable when the machine specifically requires 48V DC and its total power demand does not exceed 75W. A 48V supply must not be connected directly to equipment designed only for 24V. Verify the required voltage of every connected device before installation.
Can the NDR-75-48 replace an existing 48V power supply?
It may be a suitable replacement if the original unit's input range, 48V output, current capacity, power rating, mounting arrangement, and terminal connections are compatible. Compare the existing power supply's nameplate and installation requirements before replacing it.
Does the NDR-75-48 require a cooling fan?
The NDR Series uses fanless natural convection cooling. Provide sufficient airflow around the unit and follow the installation instructions for mounting orientation and clearance. Avoid enclosing the power supply in a space where heat cannot dissipate adequately.
What protection functions are available on the NDR Series?
The NDR Series documentation lists short-circuit, overload, overvoltage, and overtemperature protection. These functions help protect the power supply and connected equipment under abnormal operating conditions. Refer to the NDR-75-48 datasheet for the model-specific protection thresholds and recovery behavior.
Can the NDR-75-48 be installed on a standard DIN rail?
The NDR Series supports TS35/7.5 and TS35/15 DIN rail mounting. Check the NDR-75-48 product drawing and installation instructions to confirm the mounting arrangement and required clearance for your control cabinet.
Is the NDR-75-48 suitable for a compact electrical control cabinet?
The NDR-75 series is listed with a slim 32mm housing width, which can help save DIN rail space. Before installation, check the full dimensions, terminal access, cable bending space, and ventilation requirements against the available cabinet space.
What should I check before connecting equipment to a 48V DC power supply?
Check the equipment's nominal voltage, maximum current, polarity, startup demand, and total power consumption. Also verify the wiring gauge, terminal connections, grounding, and applicable installation requirements. Disconnect the input supply before carrying out wiring or maintenance.
Is the NDR-75-48 suitable for continuous industrial operation?
It is designed for industrial power supply applications, including industrial control and factory automation. Reliable operation depends on the actual load, ambient temperature, ventilation, mounting, and installation conditions. Check the model-specific temperature and load-derating specifications before planning continuous full-load operation.
Does the NDR-75-48 have active power factor correction (PFC)?
No. The NDR-75-48 does not have built-in active power factor correction (PFC). Within the NDR Series, active PFC is available only on the NDR-240 and NDR-480 models. The NDR-75-48 meets BS EN/EN61000-3-2 harmonic current requirements without active PFC. Check the model-specific datasheet or contact DAPPRA before selecting it for an application with a specific power-factor or harmonic-current requirement.
How can I confirm the NDR-75-48 is suitable for my application and request a quotation?
Provide the required quantity, input voltage, connected equipment details, expected load, and delivery destination. DAPPRA can help you check model compatibility and confirm the applicable datasheet, certifications, availability, lead time, and warranty terms before ordering.
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