Reliable high-current switching and precision engineering consumables manufactured to ISO standards
Established in 2010 in the Qingbaijiang District of Chengdu, Chengdu Suchen Environmental Protection Materials Co., Ltd. has developed into a premier, diversified manufacturing group. Over the past 14 years, we have built key competencies across three highly advanced industrial divisions: plasma cutting and welding consumables, laser cutting and welding components, and high-voltage direct current (HVDC) relays.
Our operation is fully aligned with the strict standards of the international market, supplying OEMs, system integrators, and Fortune 500 manufacturing corporations across the globe. By implementing a vertically integrated production line, Suchen guarantees that every HVDC relay and high-tolerance copper component meets robust efficiency benchmarks, assisting our clients in their transition towards environmental responsibility and grid stability.
High-Voltage & Consumable Production Experience
The global push towards carbon neutrality has transformed power distribution systems. Within this transformation, High-Voltage Direct Current (HVDC) relays operate as critical safety and routing mechanisms. Unlike Alternating Current (AC) systems where the current naturally crosses zero twice per cycle—allowing easy arc suppression—DC systems maintain a continuous voltage. This makes breaking a direct current under load highly complex, requiring advanced engineering solutions to prevent destructive electric arcs.
These relays are essential across three primary new energy application pillars:
Acts as the main safety switch in Battery Disconnect Units (BDUs). In the event of a crash or circuit short, the relay decouples the high-voltage pack in under 10 milliseconds to isolate hazardous voltages from the passengers and chassis.
Battery Energy Storage Systems require bidirectional current control. Suchen’s heavy-duty DC contactors manage continuous currents of up to 400A at 1000V DC, permitting efficient load levelling and grid-tied solar-plus-storage integration.
To support next-gen 800V charging topologies, relays must operate reliably at high ambient temperatures. Our high-voltage relays ensure reliable isolation between the grid converter and the electric vehicle's onboard charger.
Suchen's capability to deliver high-quality components for the energy transition
The industrial landscape for high-voltage DC components is characterized by a transition from standard mechanical relays to specialized, gas-filled hermetic contactors. Suchen operates as a key OEM/ODM manufacturing partner for organizations worldwide seeking custom-engineered configurations that standard catalog distributors cannot provide.
Green Sustainable Philosophy: At Chengdu Suchen, ecological stewardship is built directly into our assembly lines. By incorporating oxygen-free copper (OFC) components, halogen-free epoxy casings, and avoiding toxic gases such as Sulfur Hexafluoride (SF6) inside our arc-extinguishing chambers, we guarantee compliance with EU RoHS and REACH regulations. This allows our global partners to build sustainable supply chains without compromising on electrical endurance or thermal dissipation.
To successfully interrupt direct currents up to 1000A without destructive pitting on the relay contact tips, Suchen incorporates two primary mechanical solutions:
1. Hermetically Sealed Ceramic Arc Chambers: The contact assembly is enclosed within a high-strength alumina ceramic capsule. This chamber is evacuated and pressurized with high-purity Hydrogen (H2) and Nitrogen (N2) gas mixtures. The high thermal conductivity of hydrogen rapidly cools the plasma arc channel, causing the arc voltage to spike and extinguish quickly.
2. NdFeB Permanent Magnetic Blowout: Relays such as the NVR6V-400M incorporate internal Neodymium (NdFeB) permanent magnets placed adjacent to the contacts. The resulting Lorentz force physically drives the electric arc away from the primary contacts and into arc-chutes, lengthening it to achieve swift interruption.
| Parameters / Feature | OEM NVR6V-200D | OEM NVR6V-400M | Custom OEM HVDC Series |
|---|---|---|---|
| Nominal Operational Voltage | 450V - 1000V DC | 1000V - 1500V DC | Up to 1500V DC (Customizable) |
| Continuous Carrying Current | 200A (at 85°C) | 400A (at 85°C) | 100A - 600A Configurations |
| Arc Suppressing Medium | Gas-filled (H2/N2) Hermetic Seal | Pressurized Gas + Magnetic Blowout | Optimized Gas + Arc Chute Array |
| Mechanical Lifetime | 200,000 Cycles | 200,000 Cycles | 250,000 Cycles |
| Applications | EV Main BDU, Auxiliary Chargers | Grid BESS, Heavy Duty EV Trucks | Custom Power Distribution Units |
A structure designed for global operations and engineering support
We aim to drive the green transformation of the global manufacturing industry through continuous innovation. Serving multiple Fortune 500 enterprises, we deliver customized components that exceed safety regulations across North America, Europe, and Asia-Pacific.
Integrity, cooperation, and mutual benefit guide our partnerships. We collaborate with supply chain stakeholders to secure raw materials like high-grade alumina ceramics and pure silver contact tips, maintaining high quality for critical power applications.
Our "customer first" strategy provides responsive OEM/ODM customization. Suchen coordinates engineering departments with customers' systems design teams to supply custom packaging, auxiliary contact variants, and coil voltage modifications.
Our products comply with relevant international electrical safety and environmental directives
Suchen’s production facilities operate under ISO 9001 quality management guidelines. Our high-voltage DC contactors are built with specialized sealing techniques to satisfy safety expectations for EV drivetrains and smart power grids.
Regional variations in grid standards and environmental requirements require localized engineering designs. North American industrial designs often emphasize UL certification and specific terminal configurations, whereas European projects typically mandate compliance with IEC standards and require detailed thermal cycling reports.
Suchen offers specialized support to address local engineering needs, including customized busbars for direct integration with Battery Management Systems, varied coil voltage configurations (12V, 24V, or 48V DC with integrated economizers), and specialized auxiliary contacts to enable diagnostic feedback on the state of the relay.
The transition toward higher electrical limits continues, with passenger electric vehicle architectures shifting toward 800V-1200V systems and heavy industrial utility platforms standardizing on 1500V DC. In response, Suchen is focusing research and development on several key areas:
Solid-State Relay (SSR) Hybrid Solutions: We are researching hybrid structures that combine traditional mechanical contactors with silicon-carbide solid-state switches. This setup utilizes the semiconductor to interrupt the arc and the mechanical contactor to provide galvanic isolation, eliminating contact wear.
Smart Current Sensing: Future iterations of the NVR6V series will feature integrated shunt resistors and Hall-effect sensors, allowing the relay to monitor current, temperature, and wear, and transmit diagnostics to the Battery Management System.
Complementary precision consumables manufactured for advanced laser and plasma processing
Addressing the core technical challenges encountered by electrical engineers in HVDC designs
SUCHEN