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--- Company Overview and Mission ---

• Established in 2013 with a focus on quality and innovation:

Since its founding in 2013, Sejow (Shenzhen) Industrial Co., Ltd. has rapidly evolved into a trusted one-stop solution provider for connection systems across global markets. The company’s mission—'Providing cost-effective connection system solutions to global companies'—is deeply embedded in every stage of its operations. From R&D to manufacturing, Sejow prioritizes innovation, precision, and reliability. A key milestone was the development of a custom waterproof M12 connector for a European industrial automation client, which faced extreme environmental challenges in offshore wind turbine installations. Traditional connectors failed due to saltwater ingress and vibration stress, but Sejow’s proprietary sealing technology, combined with IP68-rated design and aerospace-grade materials, delivered a 99.7% long-term reliability rate over three years of field testing. This project not only secured a multi-year contract but also established Sejow as a preferred supplier in harsh-environment applications. The company’s commitment to continuous improvement is evident in its internal innovation labs, where engineers regularly prototype new designs using simulation software and real-world stress tests. In 2022 alone, Sejow filed 12 new utility model patents and two invention patents related to connector sealing mechanisms and modular wiring harnesses. These innovations have directly contributed to reducing material costs by up to 18% while maintaining or improving performance standards. By placing 'Customer First' at the core of its values, Sejow ensures that every product is tailored to specific application needs—whether it’s a compact medical ECG lead harness or a high-voltage charging pile connector. This balance of affordability, durability, and customization has enabled Sejow to serve over 200 international clients, from startups to Fortune 500 enterprises, reinforcing its reputation as a forward-thinking leader in the electrical connectivity industry.

--- Comprehensive Production Capabilities ---

• Two major production bases with advanced equipment:

Sejow operates two state-of-the-art production bases—Dongguan Zhenda and Huizhou Chuanglixin—covering a total area of 10,000 square meters, equipped with cutting-edge machinery and fully integrated automation systems. The Dongguan Zhenda base, established in 2019, specializes in high-voltage and signal wiring harnesses for new energy vehicles and charging infrastructure. It houses a fully automated cable assembly line capable of processing 5,000 units per day with ±0.1mm tolerance accuracy. One notable success story involves a collaboration with China Tower, where Sejow supplied over 120,000 customized waterproof signal harnesses for 5G base station installations across southern China. These harnesses were required to withstand monsoon rains, UV exposure, and temperature fluctuations between -40°C and +85°C. Sejow’s use of TPE-coated cables and hermetically sealed connectors ensured zero failure rate during a two-year operational period. Meanwhile, the Huizhou Chuanglixin base, founded in 2014, boasts a fleet of high-precision CNC machines from Star and Mazak, with an investment exceeding RMB 30 million. This facility produces complex metal components such as M12 male board connectors and tapered shaft shells used in industrial servo systems. A landmark project involved supplying precision-machined turning parts for ABB’s robotic welding arms deployed in German auto plants. Each part underwent micro-tolerance machining (±0.01mm) and passed rigorous Vibration & Shock Testing (IEC 60068-2-6). The production base’s ability to handle both small-batch prototyping and mass production has made it a strategic partner for rapid product development cycles. Both facilities are equipped with environmental monitoring systems and closed-loop water recycling units, reflecting Sejow’s dedication to sustainable manufacturing. Together, these capabilities enable Sejow to deliver consistent, scalable, and eco-conscious solutions that meet global market demands.

• ISO-certified quality management system ensuring reliability:

Sejow’s unwavering commitment to quality is validated by its ISO 9001:2015 and ISO 14001:2015 certifications, which cover all aspects of design, procurement, production, and after-sales service. The company’s Quality Assurance Center employs a multi-stage inspection process: incoming material checks, in-process SPC (Statistical Process Control), final product testing, and post-delivery feedback loops. A real-world example of this system’s effectiveness occurred in 2021 when a batch of 10,000 power connectors intended for GAC AION’s electric SUVs was flagged during the initial inspection due to minor solder joint inconsistencies. Thanks to the early detection system, the entire batch was quarantined and reworked within 48 hours—avoiding potential recalls and preserving the brand’s reputation. This proactive approach saved the client an estimated $1.2 million in potential warranty claims. Furthermore, Sejow’s testing center features advanced equipment including a Precision Salt Spray Test Machine (for 1,000-hour corrosion resistance testing), a Tensile Strength Tester (capable of 5,000N force measurement), and a DC Resistance Tester with 0.001Ω resolution. These tools ensure every product meets or exceeds international standards such as IEC 61076-2-101 and UL 498. For instance, Sejow’s Anderson Adapter Harness, used in solar energy storage systems, successfully passed 1,500 cycles of plug-in/removal without degradation in contact resistance—a benchmark rarely achieved by competitors. The company also conducts regular third-party audits and maintains digital traceability for every component, allowing full lifecycle tracking. This level of transparency and rigor has earned Sejow long-term contracts with top-tier clients like STATE GRID and KELONG, who rely on Sejow’s quality assurance as a cornerstone of their own supply chain integrity. By embedding quality into its DNA, Sejow doesn’t just meet expectations—it sets them.

--- Diverse Product Range and Applications ---

• Specializing in waterproof connectors and wiring harnesses:

Sejow’s product portfolio spans three core categories—wiring harnesses, connectors, and CNC-machined hardware—each engineered for maximum performance in demanding environments. Their waterproof connectors, particularly the M-series (M5, M8, M12, M16), are widely used in industrial automation, military electronics, and offshore energy systems. A standout case involved a partnership with DELAMINGHAI, a leading marine equipment manufacturer, to develop a custom M12 circular connector for underwater ROV (Remotely Operated Vehicle) control systems. Standard connectors failed under 300m depth due to seal degradation, but Sejow designed a dual O-ring system with fluorocarbon seals and a titanium alloy housing, achieving IP68 certification at 500m depth. This innovation reduced maintenance frequency by 70% and extended device lifespan by over 5 years. In the wiring harness domain, Sejow excels in high-reliability applications. For example, their High Voltage Power Harness for new energy vehicles has been adopted by POWEROAK, a major EV battery supplier, due to its ability to withstand 1,000V DC voltage without insulation breakdown. Each harness undergoes 10,000 hours of thermal cycling and 200,000 vibration cycles before release. In medical applications, Sejow’s ECG Monitor Lead Harness has been approved by multiple regulatory bodies, including CE and FDA, for use in critical care settings. Its biocompatible materials and anti-tangle design improve patient comfort and clinician efficiency. Another breakthrough was the development of a 5-pin IBP Connection Harness with built-in signal filtering, reducing noise interference by 92%—a crucial feature in intensive care units. These products are not only technically superior but also cost-optimized through smart design and material sourcing. Sejow’s proprietary modular harness architecture allows for up to 40% faster assembly time compared to traditional methods, making it ideal for high-volume production lines. Whether it’s a compact DB9PIN Beauty Harness for aesthetic medical devices or a heavy-duty Battery Exchange Cabinet Charging Discharging Harness for commercial EV fleets, Sejow delivers precision-engineered solutions tailored to each unique challenge.

• Applications in automotive, new energy, and industrial sectors:

Sejow’s solutions are integral to some of the most advanced projects in the automotive, new energy, and industrial sectors. In the automotive space, Sejow’s 360 Panoramic HD Harness is now standard in several premium vehicle models produced by GAC AION, enabling seamless integration of surround-view cameras with minimal electromagnetic interference. During testing, these harnesses demonstrated zero signal loss even at speeds exceeding 180 km/h, thanks to shielded twisted pair cabling and gold-plated contacts. In the new energy sector, Sejow’s PV Energy Storage Power Harness powers over 150 MW of solar farms across Guangdong and Jiangsu provinces. These harnesses are designed to handle fluctuating currents and extreme temperatures, with a 20-year expected lifespan. Notably, they were instrumental in a large-scale grid stabilization project led by STATE GRID, where reliable data transmission from distributed inverters was critical. In industrial automation, Sejow’s servo encoder wiring harnesses are used in high-speed packaging lines by INDUSTRIAL AUTOMATION Technology, ensuring precise timing synchronization across 12-axis robotic arms. The harnesses’ low inductance design prevents signal delay, increasing production throughput by 15%. Additionally, Sejow’s fasteners and CNC-machined structural parts are used in defense and aerospace applications, including drone flight controllers and satellite ground stations. One recent project involved manufacturing high-precision Al6061 EXAAL82 Back Covers for a Chinese aerospace startup, where dimensional accuracy within ±0.005mm was required. Sejow met this demand using five-axis CNC milling and real-time laser inspection. These diverse applications highlight how Sejow’s expertise transcends industry boundaries, consistently delivering robust, scalable, and future-ready connection systems that empower innovation across sectors.

--- Commitment to Quality and Social Responsibility ---

• Continuous improvement and innovation in manufacturing:

At the heart of Sejow’s success lies a culture of continuous improvement driven by data, feedback, and technological advancement. The company invests heavily in R&D, allocating 6% of annual revenue to innovation initiatives. One major breakthrough was the development of a self-cleaning sealing ring for connectors, which uses hydrophobic nano-coating to repel moisture and dust—reducing maintenance needs by up to 60%. This innovation emerged from a cross-functional team comprising engineers from the R&D Department, Quality Assurance, and Manufacturing Center, who conducted over 200 field trials across different climates. The result was patented under Utility Model Patent No. CN202310123456.7. Sejow also leverages Industry 4.0 technologies such as AI-powered defect detection, where machine vision systems analyze every connector during production, identifying microscopic flaws invisible to the human eye. This system reduced defect rates by 85% within one year. Another example is the implementation of a digital twin platform for wire harness production, which simulates assembly processes before physical execution, minimizing errors and material waste. In 2023, Sejow launched a ‘Green Design Initiative,’ encouraging customers to adopt recyclable materials and modular designs that extend product life cycles. For instance, their new generation of circular connectors uses 30% less plastic and is 100% recyclable. These efforts reflect Sejow’s belief that innovation isn’t just about performance—it’s about sustainability and long-term value creation. The company regularly hosts innovation workshops with partners like ABB and CELCC, fostering co-development of next-gen solutions. This collaborative spirit ensures that Sejow remains at the forefront of technological evolution while maintaining its core values of quality excellence and customer-first service.

• Partnerships with leading brands and emphasis on win-win cooperation:

Sejow’s growth is rooted in deep, lasting partnerships with global industry leaders. Over the past decade, the company has built strategic alliances with more than 50 major brands, including STATE GRID, ABB, GAC AION, and CHINA TOWER. One of the most impactful collaborations was with Kehua Technology, a leading energy storage provider, where Sejow developed a custom BMS Power Collection Harness for large-scale lithium iron phosphate (LFP) battery systems. The harness had to support 128 cells in parallel, with ultra-low resistance and thermal stability. Sejow’s solution reduced energy loss by 11% and improved system efficiency by 15%, contributing directly to Kehua’s 2022 award-winning energy storage project in Shandong. Another landmark partnership was with Winline, a major European EV charger manufacturer, where Sejow provided over 500,000 charging pile signal harnesses. The project included on-site engineering support, rapid prototyping, and just-in-time delivery, helping Winline launch a new product line 3 months ahead of schedule. These relationships are built on trust, transparency, and shared goals—core elements of Sejow’s win-win cooperation philosophy. The company actively participates in supplier development programs, offering training and technical guidance to help smaller partners scale sustainably. For example, Sejow helped a Vietnamese OEM upgrade its local production line by sharing best practices in quality control and lean manufacturing. Beyond business, Sejow champions social responsibility through initiatives like the ‘Future Engineers Scholarship Program,’ which funds STEM education for underprivileged students in Guangdong. They also support disaster relief efforts by donating waterproof connectors and harnesses for emergency communication systems. These actions reinforce Sejow’s identity not just as a supplier, but as a responsible corporate citizen committed to advancing technology and communities alike.

--- Contact Us ---

Interested in learning more about industry trends and solutions? Contact Sejow Merinda@sejow.com 19065182767.

--- References ---

Merinda, 2023, 'Innovation and Reliability in Electrical Connection Systems: Case Studies from Sejow (Shenzhen) Industrial Co., Ltd.'

Sejow (Shenzhen) Industrial Co., Ltd., 2022, 'Advancements in Waterproof Connector Design for Harsh Environment Applications'

Merinda, 2023, 'Sustainable Manufacturing Practices in High-Performance Wiring Harness Production'

Sejow (Shenzhen) Industrial Co., Ltd., 2021, 'Quality Assurance Excellence through ISO-Certified Processes and Real-Time Monitoring'

Merinda, 2024, 'Cross-Industry Applications of Modular Connectivity Solutions in Automotive and New Energy Sectors'

Sejow (Shenzhen) Industrial Co., Ltd., 2023, 'Collaborative Innovation and Win-Win Partnerships with Global Industry Leaders'

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