Protection type: Constant current limiting, recovers automatically after fault condition is removed
Over Voltage
6.27-7.25V
15.6-18V
31.2-36V
57.6-64.8V
Protection type: Shut down o/p voltage, re-power on to recover
ENVIRONMENT
Working Temp., Humidity
-20℃~+70℃; 20%~90% RH non-condensing
Storage Temp., Humidity
-40℃~+85℃; 10%~95%RH
Temp. Coefficient
±0.03%/℃(0~50℃)
Vibration
10~500Hz, 2G 10min./1cycle, period for 60min, each along X, Y, Z axes
OTHERS
Dimension
40*90*100mm(W*H*D)
Weight
0.3Kg
Packing
42pcs/carton/13.6kg/0.82CUFT
NOTE
1.All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
2.Ripple & noise are measured at 20MHz of bandwidth by using 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 which will be installed into a final equipment. The final equipment must be re-confirmed that it still meets EMC directives.
Product Overview
The Luyu MDR-40W series is a 40W single-output industrial DIN rail switching power supply, designed for standard rail mounting and directly installable on TS-35/7.5 or TS-35/15 DIN rails. As a representative product in the 40W power class, this series is widely used in industrial automation control systems, instrumentation, communication equipment, security monitoring, LED lighting, building intercom systems, and other fields, providing users with a stable, efficient, and reliable DC power solution.
This series includes four sub-models: MDR-40-5, MDR-40-12, MDR-40-24, and MDR-40-48, with output voltages covering 5V, 12V, 24V, and 48V to meet the diverse power supply requirements of different industrial devices. The products are strictly quality-controlled in accordance with the ISO9001:2000 international quality management system standard and comply with EU RoHS and CE certification requirements. They are ideal companion power supplies for industrial control cabinets, PLC systems, contactors, relays, and similar equipment.
Core Product Features
1. Wide-Range Universal AC Input for Global Use The Luyu MDR-40W series supports a full-range AC input of 85–264VAC, while also accepting 120–370VDC input, with a frequency range of 47–63Hz. It can be used directly in any power grid environment, whether in China, Europe, the United States, or other countries, without any switching adjustments. The AC input current is 1.1A at 115VAC or 0.7A at 230VAC.
2. Multiple Intelligent Protections for Safe and Reliable Operation
This series features three core built-in protection mechanisms:
Short Circuit Protection: When the output is short-circuited, the power supply automatically enters a protected state. Once the short circuit fault is removed, the power supply automatically resumes normal output.
Overload Protection: When the load power reaches 105%–150% of the rated output power, the power supply automatically enters constant current limiting protection mode. Output automatically recovers after the fault is cleared.
Overvoltage Protection: The overvoltage protection trip points vary by output voltage model: 6.25–7.25V for the 5V model, 15.6–18V for the 12V model, 31.2–36V for the 24V model, and 57.6–64.8V for the 48V model. When overvoltage occurs, the power supply automatically shuts down output and recovers after a power cycle.
Adopts natural convection cooling design, eliminating the need for an additional fan and reducing mechanical failure points. The product dimensions are 40×90×100mm (W×H×D) and it weighs only 0.3kg. It can be directly mounted on TS-35/7.5 or TS-35/15 standard DIN rails, occupying minimal space inside the control cabinet.
4. 100% Full Load Burn-In Test
Each power supply undergoes a 100% full load burn-in test before leaving the factory, ensuring stability and reliability under actual load conditions.
5. High Conversion Efficiency
Efficiency varies by output voltage: 78% for the 5V model, 86% for the 12V model, and 88% for both the 24V and 48V models.
6. LED Indicator for Power-On Status
Equipped with an LED power indicator that lights up when power is applied, allowing on-site maintenance personnel to quickly verify the power supply’s operating status.
Product Advantages
1. Stable Output, High Voltage Accuracy
In terms of output voltage accuracy, the 5V model achieves ±2%, while the 12V, 24V, and 48V models all achieve ±1%. Both line regulation and load regulation are controlled within ±1.0%. The setup and rise time are 500ms/30ms (230VAC, full load), and the hold-up time can reach 50ms under 230VAC conditions. This means that during brief grid fluctuations, downstream equipment will not restart due to power loss, ensuring uninterrupted industrial production.
2. Wide Temperature Operation, Broad Adaptability
The operating temperature range is -20℃ to +70℃, and the storage temperature range is -40℃ to +85℃. Combined with a humidity range of 20% to 90% non-condensing, the power supply operates stably under various climatic conditions. The temperature coefficient is ±0.03%/℃ (0~50℃), ensuring stable output voltage even in high-temperature environments.
3. Strict Electrical Isolation and Dielectric Strength
The withstand voltage is 3KVAC for input to output, 2KVAC for input to ground (FG), and 0.5KVAC for output to ground (FG). The isolation resistance is greater than 100MΩ under conditions of 500VDC / 25℃ / 70% RH.
4. Small Size, Light Weight
The 40mm ultra-slim body design is narrower than many products with the same power rating. Its weight of only 0.3kg facilitates logistics transportation and on-site installation. For bulk purchasers, the packaging of 42 units per carton also facilitates warehouse management.
5. Comprehensive Safety Certifications
The design references UL508 and TUV EN60950-1 safety standards, and the electromagnetic compatibility design references EN55011, EN55022, EN61000 series standards, as well as EN61204-3 heavy industry level. The product has passed relevant certifications and can be directly used for supporting power supply in various industrial export equipment.
Product Applications
The MDR-40W series DIN rail power supplies are widely used in the following scenarios:
Industrial Control Cabinets: Provide stable DC power for PLCs, HMIs (Human-Machine Interfaces), temperature controllers, and sensors (such as proximity switches and photoelectric switches). The control cabinet is the core application scenario for this power supply.
Automated Production Lines: Used to power various electronic control devices on automated assembly lines, meeting the requirement of 24-hour continuous operation.
Security & Surveillance Systems: Power access control systems, surveillance cameras, alarm controllers, and other security devices. Stable 24V or 12V output is the foundation for reliable operation of security systems.
Communication Base Stations: Suitable for powering base station equipment, network switches, fiber optic transceivers, and other communication facilities.
Machinery & Equipment Support: The electrical control systems of CNC machine tools, packaging machinery, textile machinery, etc., all require reliable power supply modules. The MDR-40 series can be embedded into equipment control cabinets.
Case Study Reference: A small automation equipment integrator chose the MDR-40-24 for a PLC control cabinet to power a Siemens S7-1200 series PLC and touchscreen. The customer reported that after six months of operation, there was no system reset or unexpected shutdown caused by power supply issues, and the DIN rail mounting method kept the control cabinet layout neat and tidy.
Frequently Asked Questions
Q1: How do I choose the right model?
Select the model based on the DC voltage and total power required by your system. For example: For 12V equipment, choose the MDR-40-12 (rated current 3.33A); for 24V equipment, choose the MDR-40-24 (rated current 1.7A). Be sure to leave a 20%-30% power margin to handle inrush currents during equipment startup.
Q2: What should I pay attention to during installation?
Install the power supply in a well-ventilated environment, avoiding high temperature and humidity to extend its service life. Before installation, confirm that the input voltage and output voltage meet the equipment requirements, and that the output terminals are securely connected. It is recommended to reserve adequate space for heat dissipation inside the control cabinet.
Q3: What should I do if the power supply has no output?
First, check whether the input voltage is normal by measuring the mains voltage with a multimeter to ensure it is within the 85~264VAC range. Then check whether the power supply input terminal connections are secure. Confirm whether the LED indicator is lit. If there is still no output, it may be due to over-load or over-voltage protection being triggered. Disconnect the load and try powering on again to recover.
Q4: Can this power supply be used in parallel?
The MDR-40 series uses a constant current limiting type over-load protection design, so parallel current sharing performance is limited. If higher output power is required, it is recommended to choose a higher power series from Leyu or consult technical support for parallel connection solutions.
Q5: Can this power supply be used in parallel?
The MDR-40W series uses a constant current limiting type over-load protection design, so direct parallel connection is not recommended due to limited current sharing. If higher output power is required, it is recommended to choose a higher power series from Leyu (such as MDR-60W, EDR-75W, EDR-120W, etc.) or consult technical support for guidance on parallel connection.
Q6: Can it power inductive loads (e.g., motors, relays)?
It can power small inductive loads such as relay coils, but ensure that the inductive load is within the rated current range. It is recommended to leave a larger power margin for inductive loads than for resistive loads. If necessary, add a freewheeling diode or snubber circuit at the output.
Q7: What happens if the operating temperature exceeds 70°C?
When the product operates outside the -20°C to +70°C temperature range, it may cause performance degradation, shorten service life, and increase the risk of failure. Be sure to use the power supply within its rated operating temperature range. In high-temperature environments, it is recommended to derate the power or add cooling measures.
Leyu , based in Wenzhou Leqing, enjoys a developed economy and convenient air, water, rail, and road transport. For 14 years, we have specialized in designing and producing switching power supplies and off-grid solar inverters, with CE, ROHS, CCC, IP67, and ISO9001 certifications. Our modern production and testing equipment ensure reliable performance—our 0.3‰ defect rate far exceeds the national 3% standard.
We offer OEM/ODM services (design, prototyping, production, testing, delivery) backed by senior engineers and strong R&D partnerships. Leyu products are exported to over 50 countries across Europe, the Americas, Southeast Asia, South America, and Africa. Our young, energetic foreign trade team (avg. 3 years’ experience) and our commitment to sincere, attentive service have built a trusted brand. As a high-tech enterprise integrating R&D, production, sales, and technical support, Leyu strives to become a national-class electrical company.
Company History
2021
Late 2020
Early 2020
2018
2015
2013
2009
2007
Taking Another Step Forward
The company obtained multiple intellectual property rights (patents/trademarks, etc.) and established a new company, continuously expanding its business landscape and moving toward a higher stage of development.
A New Era of Operations
An International Operations Department was formed by seven people, covering multiple platforms such as Alibaba International Station, AliExpress, Made in China, Foreign Trade Express, Google, Taobao, and Tmall. The establishment of the Operations Department marked the beginning of a new digital, multi channel era for "Leyu".
Moving to New Premises
The Foreign Trade Department moved entirely out of the factory into a brand new office building, neighboring Yueqing Ali and Times Square, upgrading both the working environment and brand image.
Shenzhen Presence
Foreign trade business expanded to Shenzhen with the establishment of a branch office, getting closer to cutting-edge markets and resources.
Factory Upgrade
The factory underwent comprehensive renovation and relocation, improving production capacity and environmental standards.
Independent Department & Market Expansion
The Foreign Trade Department was formally established, extending the sales network from Southeast Asia to Europe and accelerating internationalization.
Stepping into Foreign Trade
The company shifted its focus to foreign trade, successfully obtained foreign trade qualification certification, and officially started its overseas market journey.
Renaming and New Beginning
To expand capital scale and explore broader markets, the original "Yueqing Leyu Electric Co., Ltd." was officially renamed "Zhejiang Leyu Electric Co., Ltd.", laying the foundation for the company's upgrading and development.
Service
Leyu always puts customers at the center, integrates sincere service into every step, and with solid technology, reliable quality, efficient response, and worry-free transportation, becomes your trustworthy long-term partner.
Technical Service
Leyu provides full-process technical support from product design, drawing, and R&D to testing, ensuring that customized needs are professionally fulfilled.
After Sales Service
Leyu has established a rapid response mechanism, patiently listens to customer feedback, and promptly resolves any issues during use, so customers have no worries.
Quality Assurance
Leyu strictly implements quality control that is 100 times better than the national standard (0.3‰ failure rate). All products are certified with CE, ROHS, CCC, IP67, etc., and undergo 100% full-load burn-in testing.
Transportation Service
Leyu cooperates with multiple reliable logistics partners to provide efficient and safe domestic and international shipping solutions, ensuring products reach customers on time and in perfect condition.
Features: High efficiency, high reliability AC input range selected by switch 100% full load burn-in test Protections: Short circuit/ Over load/ Over voltage Fixed switching frequency at 25 KHz 2 years warranty
Features: Universal AC input/ full range Withstand 300VAC surge input for 5 seconds Protections: Short circuit / Overload / Over voltage Cooling by free air convection LED indicator for power on 100% full load burn-in test High operating temperature up to 70℃ High efficiency, long life and high reliability 2 years warranty
Features: Universal AC input/ full range Protections:Short circuit/ Over load/ Over voltage/ Over temperature Cooling by free air convection Can be installed on DIN rail TS-35/7.5 or 15 LED indicator for power on 100% full load burn-in test Fixed switching frequency at 67KHz 2 year warranty
Features： • Universal AC input / Full range EMC standards: •EN55022 class B • Economical and slim design • Protections: Short circuit / Overload / Over voltage / Over temperature • Cooling by free air convection • Can be installed on DIN rail TS-35 / 7.5 or 15 • EN61000-6-2(EN50082-2) industrial immunity level • 100% full load burn-in test • 2 years warranty
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Why Choose Us
Choosing Leyu means choosing quality control that is 100 times stricter than the national standard (0.3‰ vs. 3%), globally recognized certifications (CE/ROHS/CCC/IP67), and switching power supplies & off-grid inverters verified in over 50 countries — backed by excellent craftsmanship and sincere service, safeguarding every power connection you make.
Leyu Electric actively participates in numerous professional electrical and new energy exhibitions both domestically and internationally, continuously showcasing core products such as switching power supplies and off-grid solar inverters to global customers. At the booth, the company attracts many visitors with its modern craftsmanship, authoritative certifications (CE, ROHS, CCC, IP67), and quality standards that exceed national requirements.
Through live demonstrations and in-depth discussions, Leyu not only conveys its innovative design and customized OEM/ODM service capabilities but also strengthens its connections with markets in over 50 countries, including Europe, the Americas, Southeast Asia, South America, and Africa. Each exhibition serves as a powerful testament to the brand's strength, technical expertise, and commitment to sincere service, further consolidating Leyu's reputation as a responsible industry benchmark.
Certificates
We put customers first — listening to your needs, providing premium products, and offering outstanding service to fully meet your expectations.
ROHS-HLG
CE-LRS
GTS
CE-Adapter
CE
FAQ
How many voltage you can supply?
5V,9V,12V,13.8V,15V,18V,24V,36V,48V,50V,60V,110V(Depend on items).
We have the best professional and experienced engineer and strict QA and QC system.Repair rate under 0.1%-0.2%.
Can we be your distributor?
Yes, we arelooking for distributor and agent from all over the world for switching power supply, power inverter, solar controller, scrolling system. If you have any interest, pls feel free to contact us.
How to request a sample? Can the sample be engraved with a logo?
Leyu supports sample orders with MOQ as low as 1 piece and accepts custom logo on samples for OEM orders (minimum quantity and cost negotiable with our sales team). Bulk orders support full OEM/ODM customization including case color, label design, and packaging.
Welcome To Contact Us
If you have any questions or needs about our products or services, please feel free to contact us at any time. We look forward to working with you and providing you with the best packaging solutions.
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