Merryking – 20+ Years Professional Power Adapter Manufacturer
From wall plug adapters to desktop power supplies — certified, scalable, factory-direct.
Why Choose Merryking?
Built for long-term B2B cooperation, not one-time deals.
Direct Source Factory
Work directly with the manufacturer—no middlemen, no hidden markups. Get transparent pricing and full control over your supply chain.
20+ Years of OEM & Custom Experience
Two decades of delivering custom power solutions for consumer electronics, industrial equipment, medical devices, and security systems.
Transparent Pricing for Long-Term Cooperation
Clear cost structure for volume scaling. We focus on Total Cost of Ownership (TCO)—built for strategic partnerships.
Reusable Global Certifications
Complete certifications ready for resale: UL, CE, FCC, CB, UKCA. Enter target markets without recertification delays.
MOQ-Friendly for Wholesale & Pilot Orders
Start with trial orders and scale seamlessly to mass production. Flexible MOQ supports your growth journey.
Stable Quality Across Mass Production
Guaranteed batch consistency for every order. No surprises between samples and production.
Product Categories
Full power adapter portfolio from 1–600W, serving wide-ranging applications.
Wall Mount Power Adapters
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Desktop Power Adapters
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Interchangeable Plug Adapters
Explore DetailsIndustries We Serve
From medical equipment requiring strict compliance to smart home devices demanding compact efficiency, our power adapters serve the unique needs of diverse industries.
ICT / Networking
12W – 150WSecurity & CCTV
12W – 96WMedical Devices
15W – 300WIndustrial Equipment
48W – 600WLED Lighting & Display
12W – 200WConsumer Electronics
5W – 65WSmart Home Devices
5W – 36WTest & Measurement
24W – 150WWe Know What Keeps Procurement Teams Up at Night
After two decades of working with procurement professionals, we've heard the same concerns repeatedly. Here's how we've built our operations to address them systematically.
Common Pain Points
Batch Inconsistency
Unit #5,000 doesn't match unit #1. Your production line stops. Your customers complain.
Non-Reusable Certifications
You paid for testing, but the cert doesn't transfer. Re-certification delays your market entry by months.
Unstable Lead Times
Promised 4 weeks, delivered in 8. Your downstream commitments are broken. Trust is lost.
The Merryking Approach
3-Stage Quality System
IQC, IPQC, OQC with aging tests ensure every batch meets spec. Full traceability from raw materials to shipment.
Transferable Certifications
Our UL, CE, FCC, CB, UKCA certifications are designed for OEM reuse. Enter new markets without re-testing.
Predictable Production
9 production lines, 800K+ monthly capacity. Dedicated scheduling ensures your orders ship on the committed date.
Real Results from Real Partnerships
View All Case StudiesEuropean Distributor Eliminated 3-Month Certification Delay
A CCTV equipment distributor in Germany was losing market windows due to re-certification requirements. By switching to our pre-certified adapters, they launched in 4 new EU markets within 6 weeks—without additional testing costs.
US Manufacturer Reduced Defect Rate to 0.02%
An industrial equipment manufacturer in Ohio faced assembly line shutdowns due to inconsistent power adapters. After implementing our QC-matched supply process, their incoming defect rate dropped from 2.1% to 0.02% over 18 months.
Certifications & Global Compliance
Our products are certified to meet EU, US, and global safety and efficiency standards.
Launch Your Custom Power Adapter Project
Every product you receive can be configured to your exact specifications. From output parameters to branding details, our engineering team works with you to deliver adapters that integrate seamlessly into your product ecosystem.
From Concept to Mass Production
A clear 10-step path that scales with your project needs
Initial Inquiry
Share your requirements
Technical Review
Feasibility analysis
Quotation
Pricing within 24hrs
Sample Dev
Prototype creation
Sample Approval
Your validation
Shipment
On-time delivery
Packaging
Custom packaging
QC Inspection
3-stage quality
Mass Production
Full-scale mfg
Pilot Batch
Small volume test
Quality Control System
Our three-stage quality system ensures every unit leaving our facility meets specification. From incoming materials to final inspection, we maintain the consistency your production line depends on.
Incoming Quality Control
Every component is inspected before entering production. We verify supplier certifications, test electrical parameters, and check physical specifications against approved samples.
In-Process Quality Control
Real-time monitoring at critical production stages catches deviations before they compound. Our line inspectors verify assembly quality, solder joints, and interim electrical tests.
Outgoing Quality Control
Final inspection includes 100% electrical testing, safety verification, and visual inspection. Units are sampled for extended testing before shipment approval.
Aging Test
Mass Production Consistency
Our process controls ensure unit #10,000 performs identically to unit #1. Traceability from raw materials through shipment means any variation is caught and corrected immediately—protecting your assembly line from incoming quality surprises.
Factory Tour
Explore our manufacturing operations across two dedicated facilities in Shenzhen and Dongguan, totaling 9,000㎡ of production space, designed to support stable mass production and long-term OEM/ODM projects.
SMT Production Line
Automated surface mount technology
Assembly Workshop
Manual and automated assembly
Quality Control Lab
Testing and verification center
Warehouse & Packaging
Organized storage and shipping
Trusted by Industry Leaders
Power adapter manufacturing partner for OEM / ODM projects worldwide. Trusted by procurement teams who value stability, compliance, and long-term supply.
What Our Partners Say
Insights & News
Engineering perspectives, compliance guidance, and procurement insights. No marketing fluff—just practical information to help you make better sourcing decisions.
Sourcing Guide
How to Evaluate a Power Adapter Supplier: A Procurement Manager's Checklist
Beyond price sheets and MOQ quotes—the critical factors that separate reliable factories from costly mistakes in your supply chain.
Compliance
UL vs CE vs FCC: What Each Certification Actually Means for Your Product
A technical breakdown of major safety certifications, testing requirements, and how transferable certifications can accelerate your market entry.
Industry Insight
Factory vs. Trading Company: How to Tell the Difference (And Why It Matters)
The hidden costs of sourcing through middlemen, and practical verification methods to identify genuine manufacturers.
Quality
Common Quality Failures in Power Adapters: Root Causes and Prevention
Analysis of typical defect patterns, their impact on downstream assembly, and the QC processes that prevent them.
Frequently Asked Questions
Common questions about working with us, from order process to delivery timelines.
Still have questions? Our team responds within 24 hours.
Contact Our TeamTalk to an Engineer or Factory Representative
Whether you need a quotation, technical consultation, or want to discuss a custom project, our team is ready to help. We speak your language—procurement, engineering, and compliance.
"Not just another sales team—we connect you directly with the people who understand your technical and business requirements."
Response within 24 hours during business days (Mon-Sat, GMT+8)
Request a Quote or Sample
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