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NDR-75-12 12V 76W Industrial Single Output DIN Rail Power Supply
Rp250,000.00
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DAPPRA NDR-75-12 (SKU: OF57) is a 75W single output ultra-slim industrial DIN rail power supply with 12V DC / 6.3A output and universal 90–264 VAC input. 87.5% 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-75-12 Overview
The DAPPRA NDR-75-12 (SKU: OF57) 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 12V DC output at 6.3A 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 and complete protection functions including short circuit, overload (constant current limiting), over voltage and over temperature protection. Designed for TS35/7.5 or TS35/15 DIN rail mounting and certified to UL508, the NDR-75-12 is an economical, space-saving power supply solution for space-constrained control cabinets.
Key Features
NDR-75-12 Key Features
Engineered for economical, ultra-compact 12V industrial power supply applications.
- 75W Output · 12V / 6.3ASingle output configuration providing 12V DC nominal output at 6.3A rated current (0~6.3A current range) with 75W 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 (−)).
- 12~14V Output AdjustmentFront-panel +V ADJ potentiometer allows the rated output voltage to be adjusted between 12V and 14V to suit the connected load.
- 87.5% Typical EfficiencyThe NDR-75-12 achieves 87.5% typical efficiency (up to 89% across the NDR-75 range), 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 (105–150% rated output power, constant current limiting, auto-recovery), over voltage protection (14~17V) 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-75-12 unit is backed by a 3-year DAPPRA warranty for long-term operational confidence.
Specifications
NDR-75-12 Specifications
Complete technical specifications for the NDR-75-12 industrial DIN rail power supply.
Output
| DC Output Voltage | 12V |
| Rated Current | 6.3A |
| Current Range | 0~6.3A |
| Rated Power | 75W |
| Ripple & Noise (max.) | 100mVp-p |
| Voltage Adjustment Range | 12~14V |
| Voltage Tolerance | ±1.0% |
| Line Regulation | ±0.5% |
| Load Regulation | ±1.0% |
| Setup, Rise Time | 500ms, 30ms/230VAC · 1000ms, 30ms/115VAC at full load |
| Hold Up Time (Typ.) | 20ms/230VAC · 12ms/115VAC at full load |
Input
| Voltage Range | 90~264VAC · 127~370VDC |
| Frequency Range | 47~63Hz |
| Efficiency (Typ.) | 87.5% |
| AC Current (Typ.) | 1.5A/115VAC · 0.85A/230VAC |
| Inrush Current (Typ.) | 20A/115VAC · 35A/230VAC |
| Leakage Current | <1mA/240VAC |
Protection
| Overload | 105~150% rated output power · Constant current limiting · Auto-recovery |
| Over Voltage | 14~17V |
| Over Temperature | Shut down output voltage; re-power on to recover |
| Short Circuit | Protected |
Environment
| Working Temperature | −20 ~ +70°C (Refer to Derating Curve) |
| Working Humidity | 20~95% RH non-condensing |
| Storage Temp., Humidity | −40 ~ +85°C, 10~95% RH |
| Temp. Coefficient | ±0.03%/°C (0~45°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 A · BS EN/EN61000-3-2,-3 |
| EMC Immunity | BS EN/EN61000-4-2, 3, 4, 5, 6, 8, 11 · BS EN/EN55035 · BS EN/EN61000-6-2 (BS EN/EN50082-2) heavy industry level |
Reliability & Dimensions
| MTBF | 2489.6K hrs min. Telcordia SR-332 (Bellcore) · 444.6K hrs min. MIL-HDBK-217F (25°C) |
| Dimensions (W×H×D) | 32 × 125.2 × 102 mm |
| Weight | 0.45 Kg |
| Packing | 0.45Kg; 30pcs/14.5Kg/0.9CUF |
| Warranty | 3 Years |
Front Panel Controls
| +V ADJ | Output voltage adjustment potentiometer (12~14V) |
| 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-75-12 does not include active PFC. 7. The NDR-75-12 has a full-load ambient limit of 45°C, lower than the 50°C limit of higher-power NDR models — refer to the derating curve.
Model Information
NDR-75-12 Model Code
The model number identifies the NDR Series, output wattage and output voltage. DAPPRA SKU for this model: OF57.
Model Code
NDR
-
75
-
12
NDRSeries prefix — DAPPRA NDR Series Slim DIN Rail Power Supply.
75 — Output WattageOutput power rating in Watts. This model provides 75W.
12 — Output VoltageNominal output voltage in VDC. This model provides 12V DC output.
Field
Meaning
Value
NDR
Series prefix
NDR
Output Wattage
Rated output power in Watts
75W
Output Voltage
Nominal DC output voltage
12V
Example: NDR-75-12 = NDR Series, 75W output power, 12V DC output voltage. DAPPRA SKU: OF57.
Dimensions
NDR-75-12 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 | 0.45 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-75-12 Installation
The NDR-75-12 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-75-12 operates from −20°C to +70°C, with full-load operation specified up to 45°C ambient — lower than the 50°C limit of higher-power NDR models. Load derating is required above 45°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-75-12 Wiring & Terminal
The NDR-75-12 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-75-12 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 12V and 14V via the front-panel adjuster. Output current and output wattage must not exceed the rated value on its specification.
Safety & Compliance
NDR-75-12 Safety & Cautions
Read and follow all safety instructions before installing, wiring, maintaining or modifying the NDR-75-12 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-75-12 Industrial Applications
The NDR-75-12 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-75-12 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-75-12 FAQ
What is the DAPPRA NDR-75-12 DIN rail power supply?
The DAPPRA NDR-75-12 (SKU: OF57) is a 75W single-output industrial DIN rail power supply that delivers 12V DC at a rated current of 6.3A. It features a slim 32 mm metal housing, fanless natural convection cooling, and built-in protection functions. It is designed for industrial control panels, factory automation, and electromechanical equipment.
What are the output voltage, current, and power ratings of the NDR-75-12?
The NDR-75-12 provides a nominal 12V DC output, a rated output current of 6.3A, and a rated output power of 75W. The output voltage can be adjusted from 12V to 14V using the front-panel +V ADJ potentiometer. The output current and total output power must remain within the unit's rated limits.
What is the input voltage range of the NDR-75-12?
The NDR-75-12 supports a single-phase AC input range of 90–264VAC at 47–63Hz. It also supports a DC input range of 127–370VDC. Confirm the input source and follow the official wiring instructions before installation.
How many devices can the NDR-75-12 power?
The number of devices depends on their combined current consumption, startup demand, and operating conditions. The power supply is rated for up to 6.3A at its nominal 12V output, equivalent to 75W. Calculate the total load and allow for a suitable operating margin before connecting multiple devices.
Is the NDR-75-12 suitable for PLCs, sensors, and industrial control equipment?
Yes. It can be used with compatible equipment requiring a 12V DC supply, including suitable industrial control devices, sensors, and electronic equipment. Check each device's required voltage, current consumption, startup demand, and allowable ripple before selecting the power supply.
What is the efficiency of the NDR-75-12?
The NDR-75-12 has a typical efficiency of 87.5%. Actual efficiency varies with input voltage and load conditions. The product's slim design and fanless cooling help support compact industrial installations.
Does the NDR-75-12 have active PFC?
No. The NDR-75-12 does not include built-in active power factor correction (PFC). According to the product specifications, it meets BS EN/EN61000-3-2 Class A harmonic current requirements. Active PFC is available on the NDR-240 and NDR-480 models listed in the NDR Series documentation.
What protection functions are built into the NDR-75-12?
The NDR-75-12 includes short-circuit, overload, overvoltage, and overtemperature protection. Overload protection uses constant-current limiting with automatic recovery. Overtemperature protection shuts down the output; power must be cycled to restore operation after the unit has cooled and the cause has been addressed.
Can the NDR-75-12 operate continuously in an industrial control cabinet?
The NDR-75-12 is designed for industrial power applications. Its published operating temperature range is −20°C to +70°C, with full-load operation specified up to 45°C ambient for the 12V model. Load derating is required above 45°C. Proper ventilation, installation orientation, and load sizing are important for reliable operation.
Does the NDR-75-12 require a cooling fan?
No. The NDR-75-12 uses fanless natural convection cooling. Install it vertically and maintain the recommended clearances: 40 mm above, 20 mm below, and 5 mm on each side. When an adjacent device is a heat source, a clearance of 15 mm is recommended.
What are the dimensions and weight of the NDR-75-12?
The NDR-75-12 measures 32 × 125.2 × 102 mm (W × H × D) and weighs approximately 0.45 kg. Its slim 32 mm-wide housing helps save DIN rail space in compact industrial control cabinets.
Is the NDR-75-12 compatible with standard DIN rails?
Yes. The NDR-75-12 supports standard TS35/7.5 and TS35/15 DIN rail mounting. It must be installed vertically, with the input terminals at the bottom and output terminals at the top. Horizontal, upside-down, or tabletop installation is not permitted.
Can the NDR-75-12 replace an existing 12V power supply?
It may be suitable if the electrical and mechanical requirements match. Before replacing an existing unit, check the input voltage range, output voltage, rated current, power, dimensions, terminal connections, and cooling requirements. You can contact DAPPRA with the original model number or a clear nameplate photo to check compatibility.
What certifications and compliance standards apply to the NDR-75-12?
The product documentation lists UL508, TUV BS EN/EN62368-1, and EAC TP TC 004, together with industrial immunity and EMC standards. Please request the applicable certificates and confirm their validity and model coverage for your destination market before placing an order.
What is the warranty period, and how can I request a quotation?
The NDR-75-12 product page specifies a 3-year warranty. To request a quotation, provide the required quantity, delivery destination, and any technical or certification requirements. Contact DAPPRA to confirm current availability, lead time, pricing, and applicable warranty terms.
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Overview
NDR-75-12 Overview
The DAPPRA NDR-75-12 (SKU: OF57) 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 12V DC output at 6.3A 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 and complete protection functions including short circuit, overload (constant current limiting), over voltage and over temperature protection. Designed for TS35/7.5 or TS35/15 DIN rail mounting and certified to UL508, the NDR-75-12 is an economical, space-saving power supply solution for space-constrained control cabinets.
Key Features
NDR-75-12 Key Features
Engineered for economical, ultra-compact 12V industrial power supply applications.
- 75W Output · 12V / 6.3ASingle output configuration providing 12V DC nominal output at 6.3A rated current (0~6.3A current range) with 75W 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 (−)).
- 12~14V Output AdjustmentFront-panel +V ADJ potentiometer allows the rated output voltage to be adjusted between 12V and 14V to suit the connected load.
- 87.5% Typical EfficiencyThe NDR-75-12 achieves 87.5% typical efficiency (up to 89% across the NDR-75 range), 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 (105–150% rated output power, constant current limiting, auto-recovery), over voltage protection (14~17V) 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-75-12 unit is backed by a 3-year DAPPRA warranty for long-term operational confidence.
Specifications
NDR-75-12 Specifications
Complete technical specifications for the NDR-75-12 industrial DIN rail power supply.
Output
| DC Output Voltage | 12V |
| Rated Current | 6.3A |
| Current Range | 0~6.3A |
| Rated Power | 75W |
| Ripple & Noise (max.) | 100mVp-p |
| Voltage Adjustment Range | 12~14V |
| Voltage Tolerance | ±1.0% |
| Line Regulation | ±0.5% |
| Load Regulation | ±1.0% |
| Setup, Rise Time | 500ms, 30ms/230VAC · 1000ms, 30ms/115VAC at full load |
| Hold Up Time (Typ.) | 20ms/230VAC · 12ms/115VAC at full load |
Input
| Voltage Range | 90~264VAC · 127~370VDC |
| Frequency Range | 47~63Hz |
| Efficiency (Typ.) | 87.5% |
| AC Current (Typ.) | 1.5A/115VAC · 0.85A/230VAC |
| Inrush Current (Typ.) | 20A/115VAC · 35A/230VAC |
| Leakage Current | <1mA/240VAC |
Protection
| Overload | 105~150% rated output power · Constant current limiting · Auto-recovery |
| Over Voltage | 14~17V |
| Over Temperature | Shut down output voltage; re-power on to recover |
| Short Circuit | Protected |
Environment
| Working Temperature | −20 ~ +70°C (Refer to Derating Curve) |
| Working Humidity | 20~95% RH non-condensing |
| Storage Temp., Humidity | −40 ~ +85°C, 10~95% RH |
| Temp. Coefficient | ±0.03%/°C (0~45°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 A · BS EN/EN61000-3-2,-3 |
| EMC Immunity | BS EN/EN61000-4-2, 3, 4, 5, 6, 8, 11 · BS EN/EN55035 · BS EN/EN61000-6-2 (BS EN/EN50082-2) heavy industry level |
Reliability & Dimensions
| MTBF | 2489.6K hrs min. Telcordia SR-332 (Bellcore) · 444.6K hrs min. MIL-HDBK-217F (25°C) |
| Dimensions (W×H×D) | 32 × 125.2 × 102 mm |
| Weight | 0.45 Kg |
| Packing | 0.45Kg; 30pcs/14.5Kg/0.9CUF |
| Warranty | 3 Years |
Front Panel Controls
| +V ADJ | Output voltage adjustment potentiometer (12~14V) |
| 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-75-12 does not include active PFC. 7. The NDR-75-12 has a full-load ambient limit of 45°C, lower than the 50°C limit of higher-power NDR models — refer to the derating curve.
Model Information
NDR-75-12 Model Code
The model number identifies the NDR Series, output wattage and output voltage. DAPPRA SKU for this model: OF57.
Model Code
NDR
-
75
-
12
NDRSeries prefix — DAPPRA NDR Series Slim DIN Rail Power Supply.
75 — Output WattageOutput power rating in Watts. This model provides 75W.
12 — Output VoltageNominal output voltage in VDC. This model provides 12V DC output.
Field
Meaning
Value
NDR
Series prefix
NDR
Output Wattage
Rated output power in Watts
75W
Output Voltage
Nominal DC output voltage
12V
Example: NDR-75-12 = NDR Series, 75W output power, 12V DC output voltage. DAPPRA SKU: OF57.
Dimensions
NDR-75-12 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 | 0.45 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-75-12 Installation
The NDR-75-12 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-75-12 operates from −20°C to +70°C, with full-load operation specified up to 45°C ambient — lower than the 50°C limit of higher-power NDR models. Load derating is required above 45°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-75-12 Wiring & Terminal
The NDR-75-12 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-75-12 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 12V and 14V via the front-panel adjuster. Output current and output wattage must not exceed the rated value on its specification.
Safety & Compliance
NDR-75-12 Safety & Cautions
Read and follow all safety instructions before installing, wiring, maintaining or modifying the NDR-75-12 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-75-12 Industrial Applications
The NDR-75-12 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-75-12 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-75-12 FAQ
What is the DAPPRA NDR-75-12 DIN rail power supply?
The DAPPRA NDR-75-12 (SKU: OF57) is a 75W single-output industrial DIN rail power supply that delivers 12V DC at a rated current of 6.3A. It features a slim 32 mm metal housing, fanless natural convection cooling, and built-in protection functions. It is designed for industrial control panels, factory automation, and electromechanical equipment.
What are the output voltage, current, and power ratings of the NDR-75-12?
The NDR-75-12 provides a nominal 12V DC output, a rated output current of 6.3A, and a rated output power of 75W. The output voltage can be adjusted from 12V to 14V using the front-panel +V ADJ potentiometer. The output current and total output power must remain within the unit's rated limits.
What is the input voltage range of the NDR-75-12?
The NDR-75-12 supports a single-phase AC input range of 90–264VAC at 47–63Hz. It also supports a DC input range of 127–370VDC. Confirm the input source and follow the official wiring instructions before installation.
How many devices can the NDR-75-12 power?
The number of devices depends on their combined current consumption, startup demand, and operating conditions. The power supply is rated for up to 6.3A at its nominal 12V output, equivalent to 75W. Calculate the total load and allow for a suitable operating margin before connecting multiple devices.
Is the NDR-75-12 suitable for PLCs, sensors, and industrial control equipment?
Yes. It can be used with compatible equipment requiring a 12V DC supply, including suitable industrial control devices, sensors, and electronic equipment. Check each device's required voltage, current consumption, startup demand, and allowable ripple before selecting the power supply.
What is the efficiency of the NDR-75-12?
The NDR-75-12 has a typical efficiency of 87.5%. Actual efficiency varies with input voltage and load conditions. The product's slim design and fanless cooling help support compact industrial installations.
Does the NDR-75-12 have active PFC?
No. The NDR-75-12 does not include built-in active power factor correction (PFC). According to the product specifications, it meets BS EN/EN61000-3-2 Class A harmonic current requirements. Active PFC is available on the NDR-240 and NDR-480 models listed in the NDR Series documentation.
What protection functions are built into the NDR-75-12?
The NDR-75-12 includes short-circuit, overload, overvoltage, and overtemperature protection. Overload protection uses constant-current limiting with automatic recovery. Overtemperature protection shuts down the output; power must be cycled to restore operation after the unit has cooled and the cause has been addressed.
Can the NDR-75-12 operate continuously in an industrial control cabinet?
The NDR-75-12 is designed for industrial power applications. Its published operating temperature range is −20°C to +70°C, with full-load operation specified up to 45°C ambient for the 12V model. Load derating is required above 45°C. Proper ventilation, installation orientation, and load sizing are important for reliable operation.
Does the NDR-75-12 require a cooling fan?
No. The NDR-75-12 uses fanless natural convection cooling. Install it vertically and maintain the recommended clearances: 40 mm above, 20 mm below, and 5 mm on each side. When an adjacent device is a heat source, a clearance of 15 mm is recommended.
What are the dimensions and weight of the NDR-75-12?
The NDR-75-12 measures 32 × 125.2 × 102 mm (W × H × D) and weighs approximately 0.45 kg. Its slim 32 mm-wide housing helps save DIN rail space in compact industrial control cabinets.
Is the NDR-75-12 compatible with standard DIN rails?
Yes. The NDR-75-12 supports standard TS35/7.5 and TS35/15 DIN rail mounting. It must be installed vertically, with the input terminals at the bottom and output terminals at the top. Horizontal, upside-down, or tabletop installation is not permitted.
Can the NDR-75-12 replace an existing 12V power supply?
It may be suitable if the electrical and mechanical requirements match. Before replacing an existing unit, check the input voltage range, output voltage, rated current, power, dimensions, terminal connections, and cooling requirements. You can contact DAPPRA with the original model number or a clear nameplate photo to check compatibility.
What certifications and compliance standards apply to the NDR-75-12?
The product documentation lists UL508, TUV BS EN/EN62368-1, and EAC TP TC 004, together with industrial immunity and EMC standards. Please request the applicable certificates and confirm their validity and model coverage for your destination market before placing an order.
What is the warranty period, and how can I request a quotation?
The NDR-75-12 product page specifies a 3-year warranty. To request a quotation, provide the required quantity, delivery destination, and any technical or certification requirements. Contact DAPPRA to confirm current availability, lead time, pricing, and applicable warranty terms.
4 ulasan untuk NDR-75-12 12V 76W Industrial Single Output DIN Rail Power Supply
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thanks…..-barang sesuai….
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Packing aman, barang sampai dengan baik.
-
mantap sesuai pengiriman cepat dan ditest sblm dipasang normal semoga awet
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Ukurannya cukup ramping, cocok untuk panel.
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A**** (pemilik terverifikasi) –
thanks…..-barang sesuai….
Andi******** (pemilik terverifikasi) –
Packing aman, barang sampai dengan baik.
A**** (pemilik terverifikasi) –
mantap sesuai pengiriman cepat dan ditest sblm dipasang normal semoga awet
Rina******** (pemilik terverifikasi) –
Ukurannya cukup ramping, cocok untuk panel.