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Industrial DIN Rail Power Supply – MDR Series
DAPPRA DIN Rail Industrial Power Supply
MDR Series — Ultra-Slim
Plastic-Housing DIN Rail Power Supply
The DAPPRA MDR Series is an ultra-slim plastic-housing single-output DIN rail power supply series designed for space-constrained industrial control and automation applications.
Covering 10W to 96W with 5V to 48V output, the MDR Series combines a narrow profile from just 22.5 mm, universal 85–264 VAC input and fanless natural convection cooling. Models from 40W and above include a DC OK relay contact and are certified for Class I, Div 2 hazardous locations.
10–96 W
Output Power
85–264 VAC
Universal AC Input
22.5–55 mm
Ultra-Slim Width
up to 88%
Efficiency
Overview
MDR Series Overview
The DAPPRA MDR Series is an ultra-slim plastic-housing DIN rail power supply series designed for space-constrained industrial control and automation applications. It covers five power ratings — 10W, 20W, 40W, 60W and 96W — with single-output configurations of 5V, 12V, 15V, 24V and 48V DC.
The series features a universal AC input range of 85–264 VAC, fanless natural convection cooling and complete protection functions including short circuit, overload and over voltage protection. The MDR-40, MDR-60 and MDR-100 models include a DC OK relay contact and are certified for Class I, Div 2 Hazardous Locations T4. All models are designed for standard TS35/7.5 or TS35/15 DIN rail mounting.
Key Features
MDR Series Key Features
Engineered for ultra-slim, space-saving industrial power supply applications.
- Universal AC Input 85–264 VACFull-range single-phase AC input supports global mains voltages. Also supports 120–370 VDC input.
- Ultra-Slim Plastic Housing from 22.5 mmMDR-10 and MDR-20 are only 22.5 mm wide; MDR-40 and MDR-60 are 40 mm; MDR-100 is 55 mm — saving valuable space inside control cabinets.
- High Efficiency up to 88%Efficiency ranges from 76% to 88% depending on the model and output voltage, reducing energy consumption and heat generation.
- DC OK Relay Contact (40W+)MDR-40, MDR-60 and MDR-100 include a DC OK relay contact (30V/1A resistive load) on two terminal pins for remote status monitoring. MDR-10 and MDR-20 use a DC OK active signal instead.
- Complete Protection FunctionsShort circuit protection, overload protection (constant current limiting or hiccup mode, auto-recovery), over voltage protection and over temperature protection on MDR-100.
- Class I, Div 2 Hazardous LocationsMDR-40, MDR-60 and MDR-100 are certified for Class I, Div 2 Group A, B, C, D Hazardous Locations T4, suitable for use in hazardous industrial environments.
- Low No-Load Power ConsumptionBelow 0.75W for MDR-10 to MDR-60, below 1W for MDR-100 — supporting energy-efficient standby operation.
- TS35 DIN Rail MountingAdmissible DIN rail: TS35/7.5 or TS35/15. LED indicator for power on. 3 years warranty.
Model Selection
MDR Series Model Selection
Select the appropriate MDR model according to the required output power, output voltage and DC OK function.
The MDR Series is available in five power ratings — 10W, 20W, 40W, 60W and 96W. The MDR-10 and MDR-20 offer 5V, 12V, 15V and 24V outputs; the MDR-40 and MDR-60 offer 5V, 12V, 24V and 48V; the MDR-100 offers 12V, 24V and 48V. Models from 40W and above include a DC OK relay contact.
Model Code
MDR
–
40
–
24
MDRSeries prefix — DAPPRA MDR Series Ultra-Slim Plastic-Housing DIN Rail Power Supply.
40 — Output PowerOutput power rating in Watts: 10 / 20 / 40 / 60 / 100 (96W).
24 — Output VoltageNominal output voltage in VDC: 5 / 12 / 15 / 24 / 48 (varies by power rating).
Field
Meaning
Available Values
MDR
Series prefix
MDR
Output Power
Rated output power in Watts
10 / 20 / 40 / 60 / 100
Output Voltage
Nominal DC output voltage
5 / 12 / 15 / 24 / 48 VDC
Example: MDR-40-24 = MDR Series, 40W output power, 24V DC output, with DC OK relay contact.
MDR-10 / MDR-20 — 10W / 20W
| Model | Output Voltage | Output Current | Rated Power | Efficiency | DC OK | Width |
|---|---|---|---|---|---|---|
| MDR-10-5 | 5 VDC | 2 A | 10 W | 77% | Active signal | 22.5 mm |
| MDR-10-12 | 12 VDC | 0.84 A | 10 W | 81% | Active signal | 22.5 mm |
| MDR-10-15 | 15 VDC | 0.67 A | 10 W | 81% | Active signal | 22.5 mm |
| MDR-10-24 | 24 VDC | 0.42 A | 10 W | 81% | Active signal | 22.5 mm |
| MDR-20-5 | 5 VDC | 3 A | 15 W | 76% | Active signal | 22.5 mm |
| MDR-20-12 | 12 VDC | 1.67 A | 20 W | 80% | Active signal | 22.5 mm |
| MDR-20-15 | 15 VDC | 1.34 A | 20 W | 81% | Active signal | 22.5 mm |
| MDR-20-24 | 24 VDC | 1 A | 24 W | 84% | Active signal | 22.5 mm |
MDR-40 / MDR-60 / MDR-100 — 40W / 60W / 96W
| Model | Output Voltage | Output Current | Rated Power | Efficiency | DC OK | Width |
|---|---|---|---|---|---|---|
| MDR-40-5 | 5 VDC | 6 A | 30 W | 78% | Relay contact | 40 mm |
| MDR-40-12 | 12 VDC | 3.33 A | 40 W | 85% | Relay contact | 40 mm |
| MDR-40-24 | 24 VDC | 1.7 A | 40.8 W | 88% | Relay contact | 40 mm |
| MDR-40-48 | 48 VDC | 0.83 A | 39.8 W | 88% | Relay contact | 40 mm |
| MDR-60-5 | 5 VDC | 10 A | 50 W | 78% | Relay contact | 40 mm |
| MDR-60-12 | 12 VDC | 5 A | 60 W | 85% | Relay contact | 40 mm |
| MDR-60-24 | 24 VDC | 2.5 A | 60 W | 87% | Relay contact | 40 mm |
| MDR-60-48 | 48 VDC | 1.25 A | 60 W | 87% | Relay contact | 40 mm |
| MDR-100-12 | 12 VDC | 7.5 A | 90 W | 83% | Relay contact | 55 mm |
| MDR-100-24 | 24 VDC | 4 A | 96 W | 86% | Relay contact | 55 mm |
| MDR-100-48 | 48 VDC | 2 A | 96 W | 86% | Relay contact | 55 mm |
Dimensions
MDR Series Dimensions
Ultra-slim plastic housing with a compact footprint designed for space-constrained control cabinets. All dimensions in mm, tolerance ±1 mm.
MDR-10 / MDR-20
| Width (W) | 22.5 mm |
| Height (H) | 90 mm |
| Depth (D) | 100 mm |
| Housing | Plastic (blue) |
| Front Panel | DC OK indicator |
MDR-40 / MDR-60
| Width (W) | 40 mm |
| Height (H) | 90 mm |
| Depth (D) | 100 mm |
| Housing | Plastic (blue) |
| Front Panel | +V ADJ / DC OK |
MDR-100
| Width (W) | 55 mm |
| Height (H) | 90 mm |
| Depth (D) | 100 mm |
| Housing | Plastic (blue) |
| Front Panel | +V ADJ / DC OK |
Installation
MDR Series Installation
The MDR Series supports 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 10–15 cm 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
Maximum operating temperature: 70°C for MDR-10 / 20 / 40 / 60 (with derating above 50°C); 60°C for MDR-100. Do not install near fire sources or high ambient temperature locations.
06 / 06
Pollution Degree 2 Environment
Install the unit only in a pollution degree 2 environment — typically dry, well-ventilated locations such as control cabinets. Do not install in places with high moisture or near water.
The MDR Series operates with free air convection cooling and requires adequate ventilation clearance. Do not install in orientations other than vertical, such as upside down, horizontal or table-top mounting.
Wiring & Terminal
MDR Series Wiring & Terminal
The MDR Series 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.
Terminal Pin Assignment
TB1 — Input Terminal (All Models)
| Pin No. | Assignment |
|---|---|
| 1 | FG (Frame Ground) |
| 2 | AC/N |
| 3 | AC/L |
TB2 — Output Terminal (MDR-10 / 20) — 3 Pins
| Pin No. | Assignment |
|---|---|
| 1 | DC OUTPUT +V |
| 2 | DC OUTPUT -V |
| 3 | DC OK active signal |
MDR-10 / 20 use DC OK active signal (no relay contact).
TB2 — Output Terminal (MDR-40 / 60 / 100) — 6 Pins
| Pin No. | Assignment |
|---|---|
| 1, 2 | DC OUTPUT +V |
| 3, 4 | DC OUTPUT -V |
| 5, 6 | DC OK relay contact |
MDR-40 / 60 / 100 include a DC OK relay contact (30V/1A resistive load) occupying 2 pins. Contact Close = PSU turns on / DC OK. Contact Open = PSU turns off / DC Fail.
Front Panel Controls
| +V ADJ | DC output voltage adjustment potentiometer (MDR-20 / 40 / 60 / 100 only) |
| DC OK | DC output status indicator LED (all models) |
MDR-10 does not include a +V ADJ potentiometer — the output voltage is fixed.
The FG pin must be connected to PE (Protective Earth). Both -V pins and both +V pins (on MDR-40 / 60 / 100) should be connected to their respective output wires to prevent excessive current stress on a single contact. The two DC OK pins are the relay contact terminals.
Wiring Specification
Recommended Wire
| AWG | Rated Current | Cross-section |
|---|---|---|
| 18 | 0–6 A | 0.75 mm² |
| 16 | 6–10 A | 1.00 mm² |
| 14 | 13–16 A | 1.52 mm² |
| 12 | 16–25 A | 2.5 mm² |
Use stranded copper wire only. Use wires that can withstand temperatures of at least 80°C, such as UL1007.
Terminal Torque Setting
| Model Group | Torque |
|---|---|
| MDR-10 / 20 | 5 kgf-cm (4.4 Lb-in) |
| MDR-40 / 60 / 100 | 5 kgf-cm (4.4 Lb-in) |
Recommended wire strapping length: 5 mm (0.197″). Recommended screwdriver: 3 mm slotted type.
DC OK Relay Contact
| State | Condition |
|---|---|
| Contact Close | PSU turns on / DC OK |
| Contact Open | PSU turns off / DC Fail |
| Max Rating | 30V / 1A resistive load |
Applies to MDR-40 / 60 / 100. MDR-10 / 20 use DC OK active signal.
DC Output Voltage Adjustment
MDR-20, MDR-40, MDR-60 and MDR-100 include a front-panel DC output voltage adjustment potentiometer (+V ADJ). MDR-10 does not include a +V ADJ potentiometer — the output voltage is fixed. All models include a DC OK indicator LED. Output current and output wattage must not exceed the rated value on its specification.
The actual wiring should follow the wiring diagram provided in the MDR Series installation manual. Use copper wire only and ensure all strands enter the terminal connection securely.
Safety & Compliance
MDR Series Safety & Cautions
Read and follow all safety instructions before installing, wiring, maintaining or modifying the MDR Series 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
MDR Series Industrial Applications
The MDR Series is suitable for industrial control systems, factory automation equipment, electrical panels, semiconductor manufacturing equipment and hazardous location applications.
Industrial Control Systems
Factory Automation
Electrical Panels
Semiconductor Equipment
Hazardous Locations (Div 2)
Machine Control
Building Automation
Process Control
Test & Measurement
Next Step
Explore the MDR Series
Browse all MDR Series DIN rail power supply products, or return to the Industrial Power Supply category page.
Support
MDR Series FAQ
What is the DAPPRA MDR Series?
The DAPPRA MDR Series is an ultra-slim plastic-housing single-output DIN rail power supply series. It covers 10W, 20W, 40W, 60W and 96W with 5V, 12V, 15V, 24V and 48V output configurations, and is designed for space-constrained industrial control and automation applications.
What is the input voltage range of the MDR Series?
All MDR Series models support a universal AC input range of 85–264 VAC (single phase) or 120–370 VDC.
What output voltages are available in the MDR Series?
The MDR-10 and MDR-20 offer 5V, 12V, 15V and 24V output options. The MDR-40 and MDR-60 offer 5V, 12V, 24V and 48V; the MDR-100 offers 12V, 24V and 48V.
Which MDR models include a DC OK relay contact?
The MDR-40, MDR-60 and MDR-100 models include a DC OK relay contact (30V/1A resistive load) on two terminal pins. The MDR-10 and MDR-20 use a DC OK active signal instead.
What is the efficiency of the MDR Series?
Efficiency ranges from 76% (MDR-20-5) up to 88% (MDR-40 and MDR-60 24V/48V models), depending on the model and output voltage.
What is the no-load power consumption of the MDR Series?
No-load power consumption is below 0.75W for MDR-10, MDR-20, MDR-40 and MDR-60, and below 1W for MDR-100.
What is the maximum operating temperature of the MDR Series?
The maximum operating temperature is 70°C for MDR-10, MDR-20, MDR-40 and MDR-60 (with derating above 50°C), and 60°C for MDR-100.
What is the terminal pin assignment of the MDR Series?
TB1 (Input): Pin 1 = FG, Pin 2 = AC/N, Pin 3 = AC/L. TB2 (Output, MDR-10/20): Pin 1 = +V, Pin 2 = -V, Pin 3 = DC OK active signal. TB2 (Output, MDR-40/60/100): Pin 1,2 = +V, Pin 3,4 = -V, Pin 5,6 = DC OK relay contact.
What certifications does the MDR Series have?
The MDR Series is certified to UL508, UL62368-1, TUV BS EN/EN62368-1, EAC TP TC 004, BSMI CNS14336-1 and AS/NZS 60950.1. MDR-40, MDR-60 and MDR-100 are also certified for Class I, Div 2 Hazardous Locations T4.
How do I choose the right MDR Series model?
Select the MDR model according to the required output power (10W to 96W), output voltage, whether a DC OK relay contact is needed, and available DIN rail mounting space in the control cabinet.