1000ms,60ms/230VAC 1800ms,60ms/115VAC at full load
Hold Up Time
60ms/230VAC 12ms/115VAC at full load
INPUT
Voltage Range
85~264VAC 47~63 Hz; 120~370VDC
AC Current
1.6A/115V 0.96A/230V
Efficiency
76%
80%
81%
Inrush Current
Cold start 20A/115VAC 40A/230VAC
Leakage Current
<1mA/240VAC
PROTECTION
Over Load
105%~150% rated output power
Protection type: Constant current limiting, recovers automatically after fault condition is removed
Over Voltage
15-16.5V
29-34V
58-65V
Protection type: Shut down o/p voltage, re-power on to recover
Over Temp.
85℃±5℃ (TSW1) detect on heat sink of power transistor
Protection type: Shut down o/p voltage, recovers automatically after temperature goes down
ENVIRONMENT
Working Temp., Humidity
-10℃~+60℃; 20%~90% RH non-condensing
Storage Temp., Humidity
-20℃~+85℃; 10%~95%RH
Vibration
10~500Hz, 2G 10min./1cycle, period for 60min, each along X, Y, Z axes
SAFETY
Withstand Voltage
I/P-O/P: 3KVAC I/P-FG: 1.5KVAC O/P-FG: 0.5KVAC
Isolation Resistance
I/P-O/P, I/P-FG, O/P-FG: 100M Ohms / 500VDC/25℃/70%RH
STANDARD
Safety Standard
Design refer to EN60950/UL60950
EMC Standard
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
OTHERS
Dimension
55.5*125.2*100mm(L*W*H)
Weight
0.6Kg
Packing
20pcs/13Kg/1.29CUFT
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 Overview
The DR-75 series adopts standard TS-35/7.5 or TS-15 DIN rail mounting. Its compact dimensions are only 55.5×125.2×100mm (W×H×D) and it weighs 0.6kg, making it easy to integrate into various compact control cabinets. It supports a full range of AC input from 85~264VAC (while also compatible with 120~370VDC DC input) without the need for manual voltage switching, adapting to most power grids worldwide.
The internal topology uses a fixed 50kHz switching frequency, balancing efficiency and electromagnetic compatibility. Under 230VAC full load, typical efficiency reaches 76%~81% (depending on the model), with low standby power consumption, saving energy during long-term operation. Every DR-75 unit undergoes 100% full-load burn-in testing before leaving the factory, ensuring reliable “plug-and-play, long-term worry-free” operation.
Product Features
Full-range input, global use
AC input 85~264VAC covers 110V/220V levels; DC input 120~370VDC can be used in photovoltaic or battery backup scenarios.
Five-fold intelligent protection
Short circuit protection:
constant current limiting mode, auto-recovers after fault removal.
Overload protection:
constant current limiting at 105%~150% rated power, no damage to the power supply.
Overvoltage protection:
output shutdown, requires power re‑cycling to recover (e.g., 24V model trip level 29~34V).
Overtemperature protection:
shuts down output when power transistor heatsink reaches 85°C±5°C, auto‑restarts after temperature drops.
Leakage current <1mA (240VAC), ensuring operator safety.
Harsh environment adaptability
Operating temperature -10°C to +60°C, fanless natural convection cooling avoids dust intake; storage temperature -20°C to +85°C. Vibration resistance up to 2G (10~500Hz), 60 minutes per axis along X, Y, Z directions, capable of withstanding transportation vibration and mechanical shock.
Low ripple & noise
12V model: 100mVp-p, 24V: 150mVp-p, 48V: 240mVp-p (measured at 20MHz bandwidth with a 0.1μF+47μF parallel capacitor). Suitable for powering sensitive instruments and sensors.
Fast start-up and hold-up time
At full load, 230VAC start-up time 1000ms, rise time 60ms; hold-up time 60ms (230VAC) or 12ms (115VAC), preventing system reset during brief grid fluctuations.
Product Advantages: Industrial DNA in Every Detail
Compared with ordinary power supplies, Luyu DR-75 offers three core advantages:
Standardized DIN rail mounting
Compatible with TS-35/7.5 and TS-35/15 standard rails. The snap-fit structure is robust and supports vertical/horizontal installation. Replacement can be done within 5 minutes, significantly reducing cabinet wiring time.
Safety & EMC certification readiness
Designed to meet UL508 and TUV EN60950-1 safety standards; EMC meets EN55011, EN55022, EN61000-4 series heavy industrial level (Criteria A). Even when installed in cabinets with variable frequency drives or large contactors, it resists misoperation. (Note: As a component, the final equipment must be re‑verified for EMC compliance.)
Flexible output voltage adjustment
Output voltage can be increased via the front‑panel potentiometer: 12V model up to 14V, 24V up to 28V, 48V up to 53V. Compensate for line drops or adapt to special loads without changing the power supply.
Q1: Can the DR-75 start up at -20°C? A: The guaranteed operating temperature lower limit is -10°C. For lower temperature startup, pre‑heating or selecting Luyu’s wide‑temperature series is recommended. However, the unit can be stored at -20°C and will start normally after warming up to above -10°C.
Q2: How does overload recovery work? A: When the load exceeds 105%~150% of rated power, the supply enters constant current limiting mode (output voltage drops, current is held constant). Once the load returns to normal range, the output voltage automatically recovers without power cycling. However, if overvoltage protection has triggered a shutdown, you must disconnect input power, wait 5 seconds, and then reapply power.
Q3: Can I directly parallel the +V and –V terminals of two units to increase output power? A: Direct paralleling is not recommended. The DR-75 does not have active current sharing, so paralleling may cause uneven load distribution. For redundancy or higher power, please use Luyu models with active current sharing or external diode redundancy modules.
Q4: What spacing should be kept during installation? A: Due to natural convection cooling, it is recommended to leave ≥20mm clearance on left/right sides and ≥30mm at top/bottom to avoid heat accumulation. When mounting multiple units side by side, keep ≥15mm between them.
Q5: Will excessive output capacitance cause startup failure? A: Capacitive load capability: 12V model ≥2000μF, 24V ≥1000μF, 48V ≥500μF. If external capacitance exceeds these values, overcurrent protection may trigger during startup. Consider soft‑start or staged power‑up.
Q6: How to select an external input fuse? A: Use a slow‑blow type fuse. For 230VAC, choose 2A/250V; for 115VAC, choose 3A/250V. Typical cold‑start inrush current is 20A at 115VAC / 40A at 230VAC – a slow‑blow fuse avoids nuisance blowing.
Q7: What is the warranty and after‑sales support? A: Luyu provides a 2‑year full warranty for the DR-75 series. Any manufacturing defect will be repaired or replaced free of charge. For specific procedures, please contact your local distributor or the Luyu technical support hotline.
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.
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.
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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.
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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