Founded in 1988 as the Xiangshan Refrigeration Accessories Factory of Zhejiang University, our enterprise has evolved over nearly four decades into a premier high-tech hub of electromechanical and thermal control solutions. Today operating under Ningbo Taojun Refrigeration Equipment Co., Ltd. (Juntao), we stand as a cornerstone for advanced smart control systems. By bridging our deep-rooted mechanical craftsmanship in refrigeration accessories with modern micro-electric grid requirements, we have established ourselves as a premier China Latching Relay Manufacturer & Factory alongside our foundational line of high-performance filter driers, check valves, and condensers.
In 2021, Taojun was recognized as a national high-tech enterprise, reflecting our investments in technical and process innovation, manufacturing system upgrades, and advanced university collaborations. The integration of magnetic latching technology with smart HVAC, smart grid energy meters, and industrial cooling networks represents our transition to digital-era smart hardware.
Equipped with ISO9001:2015, EU RoHS, and US UL certifications, we strive to deliver system-level component integrity to global OEMs, maintaining partnerships with industry leaders such as Haier, Xinfei, Midea, Gree, Whirlpool, Electrolux, and Huarui.
Experience the precision of our smart production workshop, where raw raw materials are transformed under strict automated inspection. Our production lines integrate cutting-edge MES tracking, CCD visual inspection, and automated assembly to guarantee zero-defect components.
From the deep-drawing of pure copper pipes to the high-vacuum dry testing of molecular sieves and the mechanical calibration of latching relays, see how we maintain consistent quality across large-volume production cycles.
As global power systems move toward higher efficiency and smart automation, the demand for magnetic latching relays has expanded beyond standard electrical meters into smart home appliances, smart grid systems, EV charging stations, and industrial HVAC controllers.
Unlike standard electromagnetic relays that require continuous coil excitation to stay active, magnetic latching relays utilize a pulse drive to switch states, maintaining position mechanically via permanent magnet force. This reduces holding state power consumption to absolute zero, supporting global ESG requirements and energy conservation designs.
Modern relays demand compact footprints with high current switching capability. Utilizing advanced alloy formulations like AgSnO2 (Silver Tin Oxide) for contact nodes ensures high resistance to arc erosion and contact welding under capacitive or inductive loads, extending mechanical lifetime to over 1,000,000 switching operations.
Compliant with international smart meter standard IEC 62055-31 (UC2/UC3), our latching relays demonstrate resilient performance against fault currents up to 6000A, protecting smart grids and critical HVAC units from electrical surges and short-circuit faults.
Combining electromechanical engineering and advanced material processing to manufacture high-reliability relays alongside copper refrigeration components.
Designed for smart meters, power distribution, and commercial HVAC controllers. Features custom single or dual coil systems, load capabilities up to 120A, and contacts developed with AgSnO2 alloy to minimize contact resistance.
Engineered to absorb moisture and acids while trapping physical contaminants in cooling systems. Features a high-purity copper shell with 3A molecular sieves (≥20% water absorption) and integrated filtration meshes.
Engineered for high-pressure control in refrigeration lines. Our triple-sealed check valves and dual-gauge monitoring valves withstand pressures up to 500 PSI, supporting multi-refrigerant compatibility (R134a, R600a, R410A).
Our product lines provide integrated solutions for modern smart grid and refrigeration architectures:
By providing latching relays that comply with smart metering standards (UC2/UC3), we enable power grids to perform load-shedding and switch currents reliably up to 120A remotely.
Integrating copper filter driers and safety valves with latching control circuits protects cooling compressors from moisture, chemical degradation, and electrical overloads.
High-current load switching in EV charging stations and battery management systems demands bistable control elements. Our relay terminals manage thermal dissipation under continuous high currents.
To meet the procurement standards of global brands, Taojun sources raw materials with strict quality standards to ensure stability in demanding environments.
Our raw materials are sourced from leading global suppliers to ensure long-term stability:
Our R&D center executes exhaustive verification programs on every batch:
Our R&D center features a team of 15 senior engineers, including doctors and researchers from the University of Science and Technology of China (USTC) and Zhejiang University, keeping our products at the forefront of technical innovation.
Established as the Xiangshan Refrigeration Accessories Factory of Zhejiang University. Developed copper refrigeration dryers and valves under academic guidance.
Decomposed production management to integrated MES system controllers. Achieved ISO9001:2008 compliance, establishing standardized material tracing.
Pioneered intelligent latching relays integrated with current sensors. Expanded factory footprint to automate clean-room micro-relay assemblies.
Ningbo Taojun Refrigeration Equipment Co., Ltd. is officially certified under GB/T19001-2016 / ISO9001:2015 standards (Registration No.: 41325Q00065R0S) for the design, development, and manufacture of advanced HVAC valves, copper filter driers, and electromechanical relay assemblies.
Our compliance certificates are verified via China's CNCA database (www.cnca.gov.cn) and audited by Zhongci International Certification (www.zcgirz.com). This third-party verification provides quality assurance for international supply chain compliance.
Main Certification Document
Detailed Scope of Certification
A: Magnetic latching relays use a permanent magnet to hold their contacts in the set or reset position. Coil power is only applied as a pulse to toggle states. This design eliminates holding state power consumption, minimizes self-heating, and supports compact spacing configurations.
A: We utilize high-purity deoxidized copper tubing (TP2) and process them through high-temperature vacuum drying ovens to reduce moisture content below 10ppm. Standard argon arc welding prevents oxidation defects along the joints, ensuring long-term structural integrity.
A: Yes, all Taojun components, including our smart latching relays and copper filtration systems, comply with EU RoHS, REACH directives, and hold US UL safety certifications, ensuring seamless integration into Western markets.
A: Our standard MOQ is 500 units for customized fabrications. Production lead time averages 15 to 25 days depending on tooling requirements, backed by our 72-hour logistics tracking team.
Taojun