DIN Rail
HDR-100 100W DIN Rail Power Supply 85-264VAC Universal Input
12V / 24V / 48V
Step-Shape Plastic
Class II Isolation
Direct Factory Portfolio
Engineered LED Drivers & Industrial Power Converters
Explore our precision-manufactured power supply units deployed across European industrial control cabinets, outdoor municipal fixtures, and commercial lighting installations.
High Power
Industrial Adjustable DC Switching Power Supply 3000W 48V 60A
3000W High Load
0-48V / 0-60A Adj.
Battery Charging
LRS Enclosed
LEYU LRS-150-24 150W 24V 6.5A AC DC Switching Power Supply
Low Profile 30mm
89% Efficiency
5G Vibration Proof
Compact DIN
30W Industrial DIN Rail Power Supply 24V 1.5A AC DC Converter
TS-35 Mounting
Low No-Load Loss
PLC Cabinets
Active PFC
LEYU EDR-240-24 DIN Rail Power Supply 24V 10A 240W Active PFC
PF > 0.95
EN 61000-3-2
Heavy Automation
Narrow Panel
Ultra Slim 30W DIN Rail Switching Power Supply 12V 2A / 24V 1.5A
35mm Ultra Width
High Isolation
Convection Cooled
High Efficiency
EDR-240-24 Industrial DIN Rail Power Supply 24V 10A 240W 95% Eff.
Slim Metal Enclosure
Short Circuit/OVP
100% Full Burn-In
IP67 Waterproof
100W IP67 Waterproof LED Driver 12V 24V Constant Voltage Supply
IP67 Full Potting
Outdoor Signage
Surge 4kV Immunity
Regional Market Landscape
Bulgaria's LED Transformation: Modernizing Industrial, Commercial, and Municipal Lighting
Bulgaria has emerged as one of Southeast Europe's most dynamic manufacturing and engineering corridors. Driven by aggressive infrastructure upgrades supported by the European Union's National Recovery and Resilience Plan (NRRP), municipal public lighting modernizations across Sofia, Plovdiv, Varna, and Burgas, and the rapid expansion of industrial clusters such as the Trakia Economic Zone (TEZ), the demand for high-reliability LED driver power supplies has surged significantly.
For Bulgarian lighting Original Equipment Manufacturers (OEMs), engineering procurement contractors (EPCs), and electrical panel fabricators, the core operational challenge centers on sourcing power supply units that offer an uncompromised balance of stringent European electromagnetic compliance (EMC), robust thermal resilience, and factory-direct cost competitiveness. With European distributors imposing steep markups of 25% to 45% on localized inventory, direct factory sourcing from Yueqing Keldan Technology Co., Ltd. provides an authoritative procurement pipeline engineered to meet Bulgarian industrial and environmental mandates.
230V
Nominal Grid Stability at 50Hz
>0.95
Active Power Factor (PFC)
50,000h
MTBF Rated Operational Life
100%
Full-Load Thermal Burn-In Tested
Application Profiles
Localized Deployment Scenarios Across Bulgaria's Industry Segments
Power supplies must be selected based on localized environmental stresses, mains grid transients, and mechanical enclosures. Below are the primary deployment profiles where Keldan power solutions are delivering dependable performance across Bulgaria:
Plovdiv Industrial & Logistics Hubs
High-bay warehouse fixtures and automated factory floors in the Trakia Economic Zone utilize our EDR-240 and HDR-100 DIN rail drivers. They handle fluctuating plant power grids without harmonic distortion or nuisance tripping of safety breakers.
Municipal Smart Street Lighting
Retrofits across Sofia, Stara Zagora, and Ruse require IP67-rated constant voltage and constant current drivers capable of handling winter sub-zero temperatures (-25°C) and lightning line surges via built-in 4kV/6kV transient suppression.
Black Sea Coastal Architectural Lighting
Resorts, hotel facades, and promenade illumination in Varna and Burgas face saline maritime humidity. Fully encapsulated, silicone-potted IP67 LED drivers ensure moisture barrier integrity and continuous corrosion resistance.
Controlled Agriculture & Greenhouses
Bulgaria's expanding Thracian agricultural sector uses specialized horticultural grow lighting. Our high-efficiency LRS and 3000W adjustable platforms supply steady DC rails to multi-channel spectrum controllers with minimal thermal dissipation.
Technical Engineering White Paper
Engineering Selection Matrix for Bulgarian Electrical & Lighting Designers
Selecting the proper driver topology requires evaluating electrical parameters against the Bulgarian BDS EN norms. Operating on a 230VAC (50Hz) single-phase or 400VAC three-phase framework, lighting installations must comply with strict limits on Total Harmonic Distortion (THD) and inrush current peaks.
| Series & Architecture | Nominal Output | Power Factor (PFC) | Protection Grade | Target Local Applications | Compliance Standards |
|---|---|---|---|---|---|
| HDR Series (Step DIN) | 12V, 24V, 48V (30W–100W) | > 0.90 @ Full Load | IP20 / Class II Enclosure | Smart home cabinets, DIN distribution boards | EN 61347-1, EN 55015, CE |
| EDR Series (Slim DIN) | 24V (120W–240W) | Active PFC > 0.95 | IP20 Metal Case | Factory PLC automation, warehouse high-bays | EN 61000-3-2 Class C, CE |
| LRS Series (Enclosed Low-Profile) | 12V, 24V, 36V, 48V (35W–350W) | > 0.88 standard / PFC opt. | Vented Metal Mesh IP20 | Retail lightboxes, indoor linear fixtures, CNC | EN 60950-1, EN 55032, CE |
| Waterproof LED Series | 12V, 24V (60W–300W) | Active PFC > 0.96 | IP67 Sealed Aluminium | Municipal facades, bridge lighting, outdoor signs | EN 61347-2-13, IP67 Waterproof, RoHS |
| High-Power Adjustable | 0–48V / 0–60A (3000W) | Active PFC > 0.98 | Forced Air Cooling IP20 | Centralized DC microgrids, battery banks | EN 62368-1, CE Industrial |
Harmonic Mitigation (Class C)
Under EU standard EN 61000-3-2, lighting equipment drawing over 25W must meet Class C harmonic emission boundaries. Keldan's active PFC circuits hold Total Harmonic Distortion below 10%, protecting industrial substations from transformer overheating.
Low Ripple & Inaudible Operation
Peak-to-peak voltage ripple is held strictly below 150mVp-p. This prevents invisible strobing and high-frequency acoustic coil hum, making these drivers ideal for commercial galleries, TV broadcasting studios, and healthcare offices in Sofia.
Inrush Current Suppression
Equipped with internal NTC thermistors and zero-crossing detection relays, Keldan power modules limit startup inrush current peaks. This enables Bulgarian panel builders to run up to 16 drivers per miniature circuit breaker (Type C MCB) without nuisance tripping.
Future Industry Forecast
Bulgarian Market Development Trends: 2025–2030 Roadmap
The lighting supply chain across Eastern Europe is transitioning rapidly away from generic imports toward highly specialized, intelligent power platforms. Bulgarian technical buyers must adapt to four pivotal structural shifts:
Ecodesign & Energy Labeling Directives
Under the updated EU Single Lighting Regulation (SLR) and Ecodesign rules (EU 2019/2020), no-load standby power must not exceed 0.5W, with minimum full-load conversion efficiency thresholds set at 88%–92%. Keldan topologies are designed to satisfy these criteria directly.
DALI-2 & Zhaga-D4i Interoperability
Bulgarian smart city masterplans require lighting nodes to report power consumption, thermal telemetry, and failure alerts back to central SCADA networks. Keldan's smart driver interfaces integrate cleanly into two-wire DALI-2 bus infrastructures.
Supply Chain Disintermediation
Rising overhead in Western European hubs is compelling Bulgarian contractors to establish direct factory connections with accredited Chinese manufacturers. Cutting out third-party Western trading middlemen lowers procurement costs while granting direct access to factory R&D engineering teams.
Verified Manufacturing Authority
Yueqing Keldan Technology Co., Ltd. — Your Trusted Manufacturing Partner
Headquartered in Yueqing, Zhejiang Province—the world-renowned epicenter of China's low-voltage electrical engineering industry—Yueqing Keldan Technology Co., Ltd. has delivered power electronics excellence for over 18 years. Operating from an advanced production facility onsite-verified by TÜV Rheinland, we provide verifiable technical competence, certified production controls, and end-to-end B2B supply chain integrity.
High-Precision SMT Placement
Controlled Reflow Soldering
AOI Optical Defect Screening
100% Full-Load Burn-In Racks
Rigorous 8-Step Manufacturing & Quality Control Gate
Gate 01
IQC Inbound Inspection
Verification of Rubycon/Nichicon capacitors, Fairchild MOSFETs, and core magnetic transformers against strict tolerances.
Gate 02
Automated SMT Assembly
High-speed surface-mount placement ensuring consistent component positioning and clean solder pastes.
Gate 03
Thermal Reflow Soldering
Multi-zone heating chambers guarantee void-free solder joints resistant to mechanical shock and vibration.
Gate 04
AOI Optical Inspection
Automated optical inspection checks every solder bridge, part polarity, and microscopic placement misalignment.
Gate 05
Through-Hole & Potting
Wave soldering of heavy terminal blocks and automated vacuum silicone potting for IP67 waterproof integrity.
Gate 06
Oscilloscope Calibration
Fine-tuning of output voltage trimmers, over-voltage protection tripping points, and current-limiting feedback loops.
Gate 07
4-Hour Dynamic Burn-In
100% of finished drivers undergo high-temperature full-load stress testing to eliminate early-life field component failures.
Gate 08
Hi-Pot Safety & QA Check
3750VAC input-to-output dielectric isolation breakdown testing, final cosmetic check, and European barcoding verification.
Procurement Guidance
Frequently Asked Questions for Bulgarian Procurement Specialists
Straight answers to common commercial, regulatory, and logistics questions asked by electrical engineers, distributors, and purchasing managers in Bulgaria.
Are Keldan power supplies certified for full legal installation under Bulgarian and EU electrical codes?
Yes. Every power supply and LED driver shipped to Bulgaria carries valid CE marking and complies with the Low Voltage Directive (LVD 2014/35/EU), Electromagnetic Compatibility Directive (EMC 2014/30/EU), and RoHS Directive (2011/65/EU and amendment 2015/863). Applicable safety test reports conform to EN 61347-1, EN 61347-2-13, and EN 62368-1. Official Certificates of Conformity and laboratory test data are available to support Bulgarian technical audits and building acceptance declarations.
What are the standard shipping routes and delivery lead times to Bulgarian logistics destinations?
For urgent sampling or project-critical components, we utilize express air shipping via DHL, FedEx, or UPS directly to Sofia Airport (SOF) with a typical transit time of 4 to 7 business days. For volume container shipments (FCL/LCL), cargo departs Ningbo or Shanghai port, arriving via Mediterranean maritime routes directly at the Black Sea ports of Varna (BGSVAR) or Burgas (BGSBOJ) within 28 to 35 calendar days. We support flexible Incoterms including FOB, CIF, CFR, and DAP delivered directly to your facility in Sofia, Plovdiv, or Ruse.
How are customs clearance, customs tariffs, and VAT handled when importing into Bulgaria?
As Bulgaria is an EU member state, imports require your company's Bulgarian EORI (Economic Operators Registration and Identification) number. Power supplies and LED drivers generally fall under HS Code 8504.40 (static converters). In accordance with the EU TARIC system, the standard third-country customs duty rate is typically 0% to 3.3% depending on exact topology. Standard Bulgarian VAT (20%) is cleared through Bulgarian Customs (Агенция „Митници“) or postponed under local reverse-charge accounting protocols where applicable. Our export team provides full commercial invoices, packing lists, and export declarations.
What Minimum Order Quantities (MOQ) apply for Bulgarian distributors and project contractors?
To support prototype validation and project bidding, standard catalog items—including HDR, EDR, and LRS series—can be sampled with an MOQ as low as 1 piece. For regular batch production, standard carton quantities start at 20 to 50 pieces. Custom OEM/ODM requests (such as specialized output voltages, custom harness terminations, or branded Cyrillic laser-etched serial rating plates) typically require an MOQ of 200 to 500 units depending on the engineering scope.
How do Keldan drivers withstand Bulgarian winter freeze and summer heat extremes?
Our industrial outdoor power units utilize 105°C-rated long-life electrolytic capacitors and thermally conductive potting resins capable of cold starts down to -30°C or -40°C without output delay or startup hunting. In summer, when sealed control cabinets in the Plovdiv basin or sunny rooftops reach ambient temperatures exceeding +50°C, our units operate reliably using conservative component derating curves, maintaining stable operation up to +70°C enclosure temperatures.
