Engineering Reliable Industrial Power Supplies Since 2005
Yueqing Keldan Technology Co., Ltd. is based in Yueqing, Zhejiang — China's premier cluster for low-voltage electrical apparatus. Backed by 19 years of continuous industrial experience, we design, engineer, and manufacture standard and bespoke power conversion equipment, including DIN rail switching power supplies, ultra-thin LRS enclosed units, pure sine wave power inverters, and PWM solar controllers.
Our production premises and business operations have undergone comprehensive onsite assessment by TÜV Rheinland. We maintain dedicated SMT assembly lines, reflow soldering stations, automated optical inspection (AOI), and multi-station burn-in aging racks to satisfy the stringent requirements of global OEM/ODM procurement partners.
Third-Party Benchmark & Operational Reliability
Transparent operational metrics recorded over verified transactions, benchmarked directly against global electrical category averages.
Verified Manufacturing Lines & Equipment
Real, unretouched snapshots of our workshop floor, automated surface mount lines, and quality verification workstations in Yueqing, Zhejiang.
Surface Mount High-Precision SMT Mounter
High-speed surface-mount placement guaranteeing micro-component alignment across industrial PCBA boards.
Soldering Reflow Soldering Line
Multi-zone thermal profile management preventing cold solder joints and ensuring high durability.
Inspection AOI Automated Optical Machine
Automated visual screening identifying bridging, solder volume discrepancies, and polarity deviations.
Preparation Component Lead Trimming
Precise mechanical cutting and preparation of through-hole components prior to manual insertion.
Assembly Manual Through-Hole Welding
Certified electronics technicians welding transformers, large electrolytic capacitors, and inductors.
Calibration Calibration & Debugging
Oscilloscopes, digital multimeters, and programmable DC loads tune output voltage and safety cut-offs.
Line Assembly Final Housing Assembly
Enclosure integration, terminal block mounting, and thermal insulation fitting by 17 line operators.
Reliability Aging Testing System Racks
High-capacity burn-in test chambers conducting 100% full-load thermal stress testing on every production lot.
Stress Test Continuous Full-Load Burn-In
Screening out infant mortality defects through sustained electrical loading at elevated temperature.
Burn-in Aging Parameter Monitoring
Real-time voltage and current logging confirming ripple integrity and thermal dissipation limits.
QA Verification In-Line Process Auditing
Six dedicated QA/QC inspectors tracking production checkpoints from raw PCB to pre-potting.
Facility Clean 2,300 m² Facility Floor
Structured layout conforming to 5S industrial management practices and electrostatic discharge (ESD) standards.
Tailored Engineering for Global OEM/ODM Buyers
From initial design sketches and prototype samples to containerized export shipping, we offer end-to-end manufacturing competence.
Customization on Demand
Comprehensive engineering services tailored to mechanical dimensions, output parameters, and interface requirements.
- Drawing-based engineering design
- Sample reverse engineering & prototyping
- Custom voltage (5V, 12V, 24V, 48V, dual/triple)
- Private label silkscreen, logo, & packaging
Quality Control & Testing
Two formal testing machine stations and an established 8-tier quality gate eliminate defective components before dispatch.
- Incoming material inspection records
- Rigid vendor evaluation procedures
- AOI automated optical error tracking
- 100% full-load aging burn-in certification
Trade & Global Logistics
12 dedicated trading and logistics specialists serving industrial buyers across Europe, the Americas, and Asia.
- 18+ years global export handling
- Major Ports: Ningbo Port & Shanghai Port
- Markets: S. America 20%, Europe 25%, Asia 10%
- Flexible terms: T/T, L/C, FOB, CIF, DDP
International Standards & Test Reports
Our power supplies, inverters, and switching modules meet mandatory safety, EMC, and environmental standards for global market access.
CE Certification
Switching Power Supplies (LRS & Enclosed)
M.2022.206.C73679 CE Certification
Power Inverter & Off-Grid Converters
M.2026.206.C137037
RoHS Directive
Lead-Free Eco-Compliant Electronics
PTC26013016701C-EN01
EMC Compliance
Electromagnetic Immunity & Emissions
PTC26013016701E-EM01Partner Directly with a Verified Manufacturer
Discuss your electrical specifications, custom PCB footprint, or scheduled production order with our engineering team today.
