Stage 01 SMT Mounter Placement
High-precision automated surface mount technology (SMT) guarantees consistent component orientation, minimizing thermal stress and cold solder joints.
Production Excellence
Standardized Industrial Assembly & Quality Workstations
At Yueqing Keldan Technology Co., Ltd., each power supply unit undergoes controlled end-to-end manufacturing workflows—from surface mount automation to final load testing.
Stage 01 
Stage 02 Reflow Soldering
Multi-zone computer-controlled thermal profiles safeguard sensitive components while ensuring uniform solder wetting across PCB layers.
Stage 03 AOI Automated Optical Inspection
High-definition automated optical inspection verifies solder bridge defects, polarity deviations, and missing passive parts before hand assembly.
Stage 04 Cutting Pieces & Pre-forming
Accurate lead cutting and preparation of inductors, electrolytic capacitors, and terminal connectors for precise mechanical through-hole insertion.
Stage 05 Through-Hole Welding
Skilled operators handle reinforced solder joints on transformers, power MOSFETs, heatsinks, and terminal blocks compliant with IPC standards.
Stage 06 Enclosure Assembly
Assembly of aluminum chassis, TS-35 DIN rail locking clips, safety insulation barriers, and wire terminal harnesses.
Stage 07 Debugging & Calibration
Verification of output voltage trim range, over-voltage thresholds, short-circuit recovery, and ripple noise characteristics.
Stage 08 Aging Testing System
100% full-load elevated temperature burn-in testing across dedicated racks to weed out early-life failures before outbound packing.
Facility Showcase
Inside Our Yueqing Workshops & Warehousing
A reliable supply chain for global distributors, machinery OEMs, and electrical panel builders.
Factory Workshop Overview
Production Line Layout
Manufacturing Workshop
Assembly Workstation
Certified Operators
Post-Assembly QC
Equipment Zone
WIP Storage Area
Export Packaging Area
Warehouse & Logistics
Chassis Assembly
Burn-in Test Racks
Aging Chamber View
Process Check 01
Process Check 02
Technical Audit
Factory Specifications & Quality Capabilities
Direct manufacturing data verified through third-party factory assessments.
| Inspection Item | Verified Standard & Infrastructure | Buyer Benefit |
|---|---|---|
| SMT & Through-Hole Assembly | Automated pick-and-place lines + dedicated hand insertion & wave soldering | Consistent electronic alignment, high yield, and high batch-to-batch repeatability |
| Optical Inspection | Automated Optical Inspection (AOI) machines post-reflow | Early detection of component misalignment, bridging, and solder voids |
| Screening & Reliability | 100% full-load burn-in aging test systems under elevated operational temp | Drastic reduction of infant mortality rate in field deployments |
| Electrical Debugging | Digital power meters, oscilloscopes, DC electronic loads, Hi-Pot isolation testers | Accurate output voltage ripple, efficient conversion, and insulation safety |
| Customization Support | Design-based & sample-based OEM/ODM capabilities supported by certified engineers | Tailored voltage/current configurations, custom casings, branding, and terminal wiring |
| Traceability & Packing | Serial batch labeling, anti-static packaging, drop-tested export cartons | Safe transoceanic shipping and complete lot traceability for industrial orders |
Verified Custom Manufacturer by TÜV Rheinland
Yueqing Keldan Technology Co., Ltd. operates with verified manufacturing capability, confirmed trade background, and documented QA/QC procedures. International procurement teams are welcome to conduct on-site factory audits or video inspections.
- Onsite verified premises, staff count, and equipment
- Direct factory pricing with flexible OEM/ODM collaboration
- Strict adherence to CE, RoHS, and industrial EMC guidelines
Factory Location
Beibaixiang, Yueqing, Zhejiang, China
Hub of China's Low-Voltage Electrical Industry
Plan Your Power Electronics Project With Keldan
Discuss your custom DIN rail power supply, switching power supply, or inverter requirements directly with our technical production team.
Inquire Now