500W / 24V 20A
Dual Input Range
18+ Years
Power Supply R&D Heritage
TÜV Rheinland
Onsite Verified Factory
PF > 0.95
Active PFC Topology
100% Load
Full Aging & AOI Optical Test
Engineered Lineup
Industrial-Grade Power Conversion & DIN-Rail Units for Holguín
Precision regulated, ultra-wide input compliance, and high dielectric isolation. Certified solutions for automation panels, mining operations, remote microgrids, and maritime terminals.
20W Ultra-Slim
12V / 24V Rails
MDR-20 20W DIN Rail Switching Power Supply 12V 1.67A 24V 1A AC DC Single Output for Industrial Automation
150W 24V 6.5A
Low Profile SMPS
LEYU LRS-150-24 AC DC Switching Power Supply 150W 24V 6.5A Single Output SMPS for Industrial Equipment LED Lighting
30W / 24V 1.5A
Compact Cabinet
30W Industrial DIN Rail Power Supply 24V 1.5A AC DC Converter for PLC Control Cabinet & Building Automation
240W / 24V 10A
High Efficiency
240W Industrial DIN Rail Switching Power Supply 24V 10A Compact Size for Automation Equipment & Control Panel
3000W Heavy Duty
120A / 60A Variable
SV-3000 3KW Industrial Variable Power Supply 120A 60A for Electroplating Electrolysis & Laser Equipment AC 220V Input
High-Efficiency DC-DC & AC-DC Power Topologies Built for Eastern Cuba's Harsh Industrial Landscape
Industrial operations in Holguín province—ranging from the metallurgical nickel processing infrastructure in Moa and Nicaro to the commercial logistics port of Puerto de Vitche and surrounding agricultural sugarcane networks—operate under acute electrical and environmental challenges. Industrial engineers and electrical instrumentation contractors in this Caribbean industrial hub face persistent grid disturbances: unbuffered voltage sags, harmonic distortions caused by massive induction equipment, rolling brownouts, and tropical climatic conditions featuring ambient temperatures exceeding 38°C alongside relative humidity routinely topping 85%.
In standard commercial converters, sustained thermal stress and airborne saline particulate matter lead to rapid dielectric breakdown, electrolytic drying, and high ESR-induced switching loop collapse. Yueqing Keldan Technology Co., Ltd. resolves these field degradation issues by deploying industrial DC-DC converter modules and DIN rail switching supplies configured with conformal poly-acrylic coating, oversized thermal sinks, double-sided fiberglass FR-4 substrates, and Japanese-sourced solid capacitors rated for 105°C continuous operation with an L10 life span surpassing 50,000 hours.
"For engineers managing process control panels in Holguín, galvanic isolation between primary and secondary circuits is not a nominal feature—it is a critical protective barrier. Keldan's modules provide up to 3000VAC / 4242VDC dielectric withstand ratings, shielding sensitive PLC inputs, SCADA RTUs, and distributed 4-20mA sensor loops from inductive back-EMF and heavy ground-potential spikes common in mining extraction machinery."
Furthermore, our DC-DC converter series incorporate ultra-wide 2:1 and 4:1 input windows (covering nominal 12V, 24V, 48V, and 110V DC battery buses). This allows continuous, uninterrupted operation even during critical deep-discharge sequences of industrial station batteries, ensuring that communication radios, supervisory emergency relays, and turbine monitoring consoles maintain regulated voltage rails (±1% line and load regulation) without transient reboots.
Galvanic Isolation & Noise Rejection
Equipped with low-leakage planar magnetic transformers providing >3000VAC isolation. Advanced primary-secondary Faraday shielding attenuates common-mode conducted emissions below EN 55032 Class B thresholds, safeguarding sensitive analytical and measurement instrumentation.
Tropicalized Thermal Hardening
Every module destined for Caribbean maritime and tropical environments undergoes automatic conformal dip-coating against salt-mist corrosion, fungal degradation, and conductive dust. Fully rated up to 60°C ambient without derating via natural convection or extruded chassis sinks.
Wide Dynamic Input Tolerance
Engineered to absorb sudden supply drops and surge transients up to 300VAC/VDC spike conditions. Built-in TVS surge suppressors, active clamp circuits, and continuous short-circuit hiccup recovery prevent cascading catastrophic failures across control cabinets.
Local Infrastructure Integrations
Mission-Critical Application Scenarios in Eastern Cuba
Precision-tailored power conversion engineering supporting Holguín's foundational economic, extraction, and utility pillars.
Moa Nickel & Cobalt Hydrometallurgical Plants
In high-pressure acid leach (HPAL) refining circuits, extreme sulfur dioxide and chemical vapors rapidly corrode standard open electronics. Keldan's enclosed DIN rail supplies and sealed DC-DC units provide clean 24VDC telemetry power to slurry pump controllers, pH sensors, autoclave temperature transmitters, and motor protection relays across Moa's mineral processing complexes.
Island Microgrids & PV Solar Hybrid Stations
To reduce reliance on imported heavy fuel oil, Holguín is aggressively rolling out utility and rural photovoltaic solar fields. Our DC-DC step-down converters stabilize fluctuating battery bank voltages (48V/110VDC down to regulated 12V/24VDC), energizing SCADA tracking actuators, remote meteorology stations, cellular gateways, and night-time security illumination clusters.
Port of Gibara & Vitche Logistics Maritime Systems
Commercial crane controls, automated weighbridges, container terminal logistics, and maritime navigational aids depend on uninterrupted auxiliary power. Our high-amperage switching power converters, such as the SV-3000 series, provide galvanic buffer and variable precision regulation, resisting marine salt air exposure and heavy vibrational mechanical shock from gantry container operations.
Strategic Industrial Outlook
Technological & Procurement Trends Shaping Holguín’s Power Electronics Sector (2025–2030)
1. Decentralization of Energy Storage & Battery Hybridization: In response to macro-grid load-shedding occurrences, municipal water pumping stations and industrial enterprises across Holguín are integrating localized lithium iron phosphate (LiFePO4) and gel-acid storage systems. This shift creates substantial demand for bidirectional and high-step-ratio DC-DC buck/boost converters able to bridge varying battery string voltages with legacy 24V control architectures.
2. Tightening EMC and Power Quality Compliance: Heavy inductive drives in processing facilities inject massive harmonic currents back into private substation transformers. Cuban engineering procurement specifications increasingly mandate EN 61000-3-2 Class D active Power Factor Correction (PFC > 0.95), minimizing line harmonic pollution and avoiding penalty surcharges or transformer core overheating.
3. Transition to DIN-Rail Modular Standardization: Cabinet builders in eastern Cuba are systematically migrating away from bulky, non-standardized linear transformers toward slimline TS-35 DIN rail power converters. Modular form factors enable local maintenance technicians to swap out units in minutes without drilling or re-wiring panels, drastically shortening mean time to repair (MTTR) during unscheduled operational stoppages.
The Keldan Advantage
A Verified Custom Manufacturer Built on Rigorous Quality
Third-party verified engineering, end-to-end component traceability, and specialized international export procedures to support procurement managers worldwide.
Verified Manufacturing
TÜV Rheinland Audited
Our production facilities, testing capabilities, and QA protocols in Yueqing, Zhejiang, are onsite audited and verified by TÜV Rheinland. We operate verified SMT placement, reflow ovens, and clean assembly lines.
100% Reliability Screen
Full-Load Burn-In Aging
Zero-defect philosophy: Every DC-DC module, DIN-rail supply, and switching converter undergoes incoming component verification, AOI optical screening, manual calibration, and 100% thermal full-load burn-in aging.
Tailored Engineering
OEM & ODM Customization
Our R&D engineering team (5+ senior engineers, each with 5+ years in SMPS development) designs custom output voltage rails, unique terminal interfaces, wide input spans, and tropicalized conformal enclosures from your specifications.
Logistics Expertise
10+ Years Export Experience
Our dedicated 12-person international trade department manages comprehensive documentation, sea/air cargo consolidation, compliant labeling, and customs formalities to ensure seamless delivery to your port of destination.
Procurement FAQ
Frequently Asked Questions by Industrial Buyers in Holguín
Direct technical and operational answers to facilitate smooth supply chain planning, custom ordering, and tropical environment deployment.
How do Keldan DC-DC converters withstand high tropical humidity and saline air in coastal areas like Gibara and Moa?
All our industrial-grade modules can be optioned with military-spec conformal coating (MIL-I-46058C approved) that creates a moisture-proof, fungus-resistant, and anti-corrosive chemical barrier across all PCB traces and solder pads. Additionally, our enclosed chassis use anti-oxidation treated aluminum and galvanized steel, preventing rust and electrical tracking even under 95% non-condensing relative humidity.
Can your DC-DC converters operate reliably from variable 48V or 110V battery backup banks during brownouts?
Yes. We offer wide-range 2:1 and ultra-wide 4:1 input series specifically designed for industrial battery bank applications. For instance, our 48V models handle continuous swings from 36V to 72V DC, while our high-voltage units accommodate deep-discharge drops and equalizing over-charge cycles without compromising the tight ±1% output regulation necessary for PLC operations.
What is the typical Minimum Order Quantity (MOQ) and lead time for shipments to the Caribbean?
Standard models (such as NDR-240, MDR-20, and LRS series) maintain an MOQ as low as 1 piece for engineering evaluations and prototyping samples. Production volume runs typically feature an MOQ of 10 to 50 units. Standard lead times range from 7 to 15 days from Yueqing factory dispatch, coordinated through maritime shipping routes or express air cargo to Caribbean hubs.
Are technical test reports, CE certifications, and factory burn-in records provided before shipping?
Absolutely. Every shipment is accompanied by CE Declaration of Conformity documents, electrical parameter test sheets, and Certificate of Inspection confirming that 100% of the units successfully passed AOI visual testing, dielectric withstand insulation checks, and 2-to-4 hour thermal aging tests under full resistive load.
Do you support customized voltage outputs (e.g., non-standard 15V, 28V, or 60V rails)?
Yes. As a verified custom manufacturer, our engineering team can adjust transformer winding topologies, feedback control loops, and component ratings to produce custom output voltages, multi-channel isolated rails, custom-dimensioned chassis, and private-label silk-screening tailored to your project’s technical specifications.
