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Founded in 2010 in the Qingbaijiang District of Chengdu, Chengdu Suchen Environmental Protection Materials Co., Ltd. has established itself as an authoritative leader in high-precision engineering and energy management technologies. With over 14 years of manufacturing expertise, we focus on three main business sectors: plasma cutting and welding consumables, laser cutting and welding consumables, and advanced high-voltage DC relays (HVDC relays).
Our commitment to excellence translates into critical system components designed for the international market. We support infrastructure and manufacturers across Europe, North America, and Asia, delivering high-performance products that guarantee mechanical durability, thermal dissipation, and electrical reliability.
Our long-term partnerships with Fortune 500 companies reflect our capabilities. By merging raw material innovation with advanced manufacturing, we ensure that every HVDC relay delivers optimized switching efficiency, low contact resistance, and long-term insulation integrity.
In high-voltage direct current systems, managing electric arcs during contact opening is one of the most critical safety challenges. Unlike Alternating Current (AC) systems, which feature natural zero-crossings that help extinguish arcs, DC currents maintain continuous voltage. This promotes persistent arcing that can melt contacts and damage equipment. Achieving safe switching at high voltages requires specialized technical solutions.
At Chengdu Suchen, our HVDC relays utilize advanced ceramic-to-metal active brazing technology. In contrast to standard epoxy-sealed alternatives, ceramic encapsulation offers superior thermal stability and structural integrity. This prevents gas leakage even under high thermal stresses. The hermetically sealed chamber is evacuated and backfilled with high-thermal-conductivity gases (typically a mixture of hydrogen and nitrogen) under pressure. This gas mixture quickly cools and extinguishes the arc, preventing oxidization of the electrical contacts and ensuring stable, low contact resistance over hundreds of thousands of cycles.
To safely manage arcs in space-constrained packages, Suchen integrates high-energy permanent magnets adjacent to the electrical contacts. These magnets generate a directional Lorentz force that stretches and blows the electric arc away from the contact surfaces and into specialized arc-extinguishing chambers. This rapid elongation cools the arc below its ionization threshold within milliseconds, preventing contact wear and welding.
The selection of contact materials directly determines the relay's capability to withstand high inrush currents during pre-charge cycles. Suchen uses advanced silver-based alloys (such as Silver Tin Oxide - AgSnO2) that offer high resistance to contact welding, low material transfer, and excellent electrical conductivity. These materials help ensure reliable operation even under severe inductive load switching conditions.
Our engineering vision aligns with the evolving requirements of smart grids, higher system voltages, and intelligent diagnostics.
As utility-scale photovoltaic plants and energy storage systems move from 1000V to 1500V configurations to reduce line losses, Suchen is engineering a new generation of HVDC relays with creepage distances and dielectric isolation ratings designed for 1500VDC environments.
Modern system architectures require predictive maintenance. Suchen's technical roadmap includes integrating micro-sensors directly within the relay housing to monitor contact resistance, internal temperature, and cycles in real time, communicating via CAN bus or Modbus protocols.
To leverage the fast switching speed of semiconductors alongside the galvanic isolation of mechanical relays, Suchen is researching hybrid solid-state HVDC switches that eliminate arc wear entirely while maintaining low conduction losses.
Our high-voltage DC relays are deployed globally to support critical safety and switching functions across key industrial segments:
In electric vehicles, the Battery Disconnect Unit (BDU) requires high-voltage contactors to isolate the lithium battery pack from the inverter, motor controller, and auxiliary systems. Suchen's relays, including our NVR6V-200D and NVR6V-500 series, are engineered for EV applications. They are designed to withstand high-current surges, support fast-charging profiles, and provide reliable isolation during safety shutoffs or collision events.
Commercial, industrial, and utility-scale energy storage systems aggregate multiple battery racks to store megawatts of power. These systems require reliable protection components to isolate battery strings during faults or maintenance. Our high-voltage DC relays operate in these environments to protect battery assets and support stable power delivery to the grid.
As PV inverters operate at high DC voltages, reliable safety disconnects are essential. Suchen's relays facilitate rapid shutdown, automatic grid isolation, and ground fault safety switching in PV array junction boxes and central inverters, helping operators meet regulatory compliance standards like NEC 690.
Ultra-fast charging networks (350kW+) rely on high-voltage DC paths to transfer energy directly to EV batteries. Suchen's high-current, ceramic-sealed relays provide the contact reliability needed to handle rapid thermal cycles and frequent connect-disconnect operations under load.
Suchen's manufacturing facilities in Chengdu leverage automated, high-precision assembly and strict quality controls to ensure production reliability.
Our modern manufacturing facility is built on a Factory 4.0 architecture, integrating automation from initial coil winding to final functional testing. By maintaining in-house control over core processes, we reduce lead times and ensure stable quality output.
We believe that technical performance and environmental responsibility go hand in hand. Suchen operates on a foundation of long-term partnership, reliability, and continuous technological improvement.
Our vision is to become a globally recognized supplier of environmental materials and new energy components, driving the green transformation of the global manufacturing industry. We are committed to technological innovation and market development, striving to enhance product performance and market competitiveness to meet the growing demands of our customers. We serve multiple Fortune 500 companies and have received consistent praise from our clients.
In terms of corporate culture, Suchen advocates the core values of "integrity, cooperation, and win-win." We deeply understand that integrity is the cornerstone of enterprise development, and we always adhere to treating people with honesty to establish long-term cooperative relationships. We encourage teamwork and advocate for the sharing of knowledge and experience to achieve efficient integration and utilization of resources. Win-win is the goal we pursue together with our customers, suppliers, and partners, aiming to create a mutually beneficial situation through our joint efforts.
Chengdu Suchen Environmental Protection Materials Co., Ltd. will continue to uphold the service philosophy of "customer first," committed to promoting the development of green and environmentally friendly initiatives, and working hand in hand with global partners to create a better future. We look forward to collaborating with you to jointly open a new chapter in sustainable development.
Suchen's manufacturing processes and product lines are certified to meet international standards for quality and environmental impact.
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