Protection type: Constant current limiting, recovers automatically after fault condition is removed
Over Voltage
5.75-6.75V
13.8-16.2V
17.25-20.25V
27.6-32.4V
Protection type: Shut down o/p voltage, re-power on to recover
ENVIRONMENT
Working Temp., Humidity
-20℃~+60℃; 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; Mounting: Compliance to IEC60068-2-6
SAFETY
Withstand Voltage
I/P-O/P: 3KVAC
Isolation Resistance
I/P-O/P: 100M Ohms / 500VDC/25℃/70% RH
STANDARD
Safety Standard
Design refer to EN60950/UL60950
EMC Standard
Design refer to
ENIEC 61558-1:2019/EN61558-2-16:2009+A1:2013
EN62368-1:2020+A11:2020
EN 60335-1:2012+A11:2014+A13:2017+A1:2019+A2:2019+A14:2019/EN62233:2008
, heavy industry level, criteria A
OTHERS
Dimension
78*93*56mm(W*H*D)
Weight
0.27Kg
Packing
48pcs/14Kg/1.02CUFT
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 0.1μ & 47μ 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 Introduction
The Leyu DR-30 series is a single-output rail power supply with a rated power of 30W, covering four common voltage options: 5V/3A, 12V/2A, 15V/2A, and 24V/1.5A. It is designed for auxiliary power inside control cabinets, small automation equipment, and distributed sensor nodes. The compact dimensions are 78×93×56mm, and it weighs only 0.27kg.
Unlike higher-power models in the same family, the DR-30 emphasizes "sufficient, reliable, easy to install." It supports a universal wide input of 85~264VAC and is also compatible with 120~370VDC for DC backup power. The unit uses fanless natural convection cooling and can be directly clipped onto a standard TS-35/7.5 or TS-35/15 DIN rail. Each unit undergoes 100% full-load burn-in testing before shipment and comes with a 2-year warranty.
Product Features
Four models covering low-voltage needs Provides 5V, 12V, 15V, and 24V output. The 5V model delivers 3A (15W), and the 24V model delivers 1.5A (36W), suitable for PLCs, relays, LED indicators, and other loads.
Constant current limiting overload protection When the load exceeds 105%~160% of rated power, the output automatically switches to constant current mode and the voltage drops. After the fault is removed, the voltage automatically recovers without needing to power cycle – very friendly for unattended cabinets.
Ultra-narrow width saves rail space Width is only 78mm, more than 15% narrower than many competitors of the same power rating. When multiple power supplies are mounted side by side, more space is left for ventilation and wiring.
Low ripple and low standby Ripple & noise ≤80mVp-p for 5V model, ≤120mVp-p for 12V/15V, and ≤150mVp-p for 24V. No-load power consumption is not explicitly listed (practically <0.3W), meeting energy efficiency requirements.
Wide temperature operation and vibration resistance Full load output from -20℃ to +60℃ (derating required above 60℃). Compliant with IEC60068-2-6 vibration standard (10~500Hz, 2G), suitable for factories, outdoor cabinets, and similar environments.
Safety and certifications Designed with reference to UL60950-1, TUV EN60950-1, EN50178. EMC meets heavy industry level (EN61000-6-2, Criteria A). Input-output isolation withstand voltage is 3KVAC.
Product Advantages
"Zero-operation" overload recovery Most cheap power supplies require a power cycle after overload. The DR-30’s constant current limiting mode automatically resumes output once the load returns to normal – virtually zero maintenance cost.
One series covers multiple low voltages 5V for microcontrollers or logic circuits, 12V for relays, 24V for sensors – different models within the DR-30 series cover all, eliminating the need to mix brands.
High tolerance for rail mounting The spring clip is carefully tuned – neither loose enough to detach nor so tight that it cracks the plastic housing. Even with slightly deformed rails, it still holds firmly.
Trustworthy measured data All parameters are measured at 230VAC, rated load, and 25℃ ambient. 100% burn-in test. Ripple is measured at 20MHz bandwidth using twisted-pair wire with a 0.1μF//47μF parallel capacitor – real and reliable.
Product Applications
Application Scenario
Recommended Model
Description
PLC expansion module power supply
DR-30-24
24V/1.5A can power 3–5 small I/O modules
Sensors and transmitters
DR-30-12 / 24
Pressure, temperature, proximity switches
Intermediate relays in control cabinets
DR-30-12
12V/2A can drive about 20 relays
5V logic systems (e.g., Arduino)
DR-30-5
5V/3A, ripple as low as 80mV
Small access controllers
DR-30-15
15V/2A (30W), suitable for some electromagnetic locks
Charging pile internal control board
DR-30-12
Wide input, compatible with DC bus
In addition, the DR-30 is also well suited for building automation, smart lighting distribution boxes, small robot control cabinets, and other applications requiring reliable low-power DC power.
Frequently Asked Questions
Q: The DR-30-5 is rated at 15W, but the series is called 30W. Is that misleading? A: No. The series name "DR-30" indicates that the highest power model in the series is close to 30W (DR-30-15 is 30W, DR-30-24 is 36W). Other models have lower power but share the same housing, rail clip, and PCB design, so they are grouped into the same series.
Q: Why doesn't the voltage come back after overload protection? A: Please confirm that the load has been completely removed. The DR-30 uses constant current limiting. If the load still has a short circuit or remains too heavy, the power supply will stay in current limit mode. Only when the fault completely disappears will the output voltage recover within 2–3 seconds.
Q: Can it be mounted horizontally? A: Yes. However, make sure the ventilation holes face up or down and are not blocked. When mounting horizontally, leave at least 20mm of space above and below.
Q: Can the 5V model be used to charge a mobile phone? A: Not recommended. Although the voltage is the same, industrial power supplies have slower transient response and no USB protocol detection on the output. Forcing it may damage the phone's charging circuit.
Q: When powered by DC 120V, does efficiency change? A: It drops slightly, about 2%~3% lower than with AC input. However, it still provides stable output within specifications and does not require additional derating at full load.
Q: Does it have UL or CE markings? A: The Leyu DR-30 is designed in reference to UL/TUV/EN standards, but it is sold as a component. Final equipment requires its own certification. We can provide relevant technical documents to assist customers with system certification.
Q: What if the operating temperature exceeds 60℃? A: Derate 2.5% per 1℃ increase. For example, 75% load at 65℃, 50% load at 70℃. Operation above 75℃ is prohibited.
Q: Can it be used for LED strip dimming? A: Yes, but dimming requires a PWM controller connected in series on the output side. The power supply itself does not support dimming. The constant voltage output is suitable for standard single-color LED strips.
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
Our goal is to work closely with partners to help customers achieve greater success in multiple fields.
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.
This 2025 handbook provides B2B buyers and engineers with a step‑by‑step guide to sizing, selecting, and installing DIN‑rail power supplies, focusing on Leyu’s MDR, NDR, and LPV series. It covers DIN rail dimensions, key electrical parameters, a worked load calculation example, temperature derating, protection features, required certifications (UL508, IEC 61010‑1, SEMI F47), mechanical/thermal design rules, EMC wiring practices, commissioning, preventive maintenance, troubleshooting, and a ready‑to‑order BOM checklist. The guide also includes a company profile of Leyu Power and B2B FAQs.
This 2026 guide equips B2B procurement professionals and engineers to select, specify, and install DIN rail power supplies for industrial automation. It covers definition, operating principles, differences from regular supplies, and 2026 market data ($2.28B, 4.47% CAGR). The guide details all types (single‑phase, three‑phase, DC/DC), a 7‑step selection process (load calculation, derating, protections, certifications, efficiency), and critical standards (IEC/EN 62368‑1, SEMI F47, UL508). It also includes installation best practices, TCO analysis, common mistakes, a quick‑selection checklist, and a competitive landscape (PULS, MEAN WELL, Siemens). Aimed at reliable, cost‑effective solutions for control panels.
First, a few wordsEver had a battery‑powered device die because the voltage dipped? Or a solar panel array underperform because the DC level just wouldn’t match what comes after?That’s where a DC‑DC converter steps in. It’s not glamorous, but it’s inside almost every system that runs on DC – EV auxi
Choosing between a 12V and a 24V system often feels like a technical crossroads. If you are designing a control panel or upgrading an automated line, this decision dictates which components you can buy and how much heat your cabinet will generate.
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%.
What's your delivery time?
Sample or small quantity order delivery in3-5 working days, large quantity order normally ship in 10-20working days.
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.
Do you accept OEM&ODM?
Yes.of course.
professional manufacturer accept customized and OEM .
What are the energy consumption standards for household appliances?
The energy consumption standards for household appliances are usually regulated by relevant national departments, and different products have different energy efficiency level standards. Consumers can choose energy-saving products based on their energy efficiency levels.
What are the precautions for repairing and maintaining household appliances?
When repairing and maintaining household appliances, it is necessary to follow the maintenance instructions in the product manual, regularly clean and check the power cord, and avoid overloading. If there is a malfunction, professional maintenance personnel should be contacted in a timely manner.
What is the service life of household appliances?
The service life of household appliances varies depending on the type and quality of the product. Generally, well maintained household appliances can last for 5-10 years or more.
What issues should be noted when purchasing household appliances?
When purchasing household appliances, it is important to pay attention to factors such as product quality, functionality, energy efficiency rating, after-sales service, and brand reputation, and choose products that are suitable for your needs.
What issues should be noted when purchasing household appliances?
When using household appliances, the following safety precautions should be followed: avoid mixing water and electricity, avoid long-term no-load operation, avoid using damaged appliances, avoid overloading, etc., to ensure household safety.
How long is the warranty period for household appliances?
The warranty period for household appliances varies depending on the product type and brand, with a general warranty period of 1-2 years. Consumers should pay attention to the warranty policy when purchasing.
How to use household appliances for energy-saving purposes?
In order to save energy and reduce energy consumption, the following measures can be taken: selecting products with high energy efficiency levels, avoiding long-term standby, using timing functions reasonably, and regularly cleaning and maintaining.
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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