High-reliability products engineered to meet rigorous industrial standards and energy efficiency demands.
Years of Engineering Expertise
Global Export Markets
R&D PhDs & Academic Experts
Strict QA Defect Rate
Under the engineering leadership of Ningbo Taojun (Juntao), we explore the structural evolution of magnetic latching technologies designed for modern smart grids and advanced energy storage systems.
Magnetic latching relays represent a pinnacle of efficiency in electrical switching systems. Unlike standard monostable relays, which require continuous coil power to maintain state, a latching relay relies on a bistable permanent magnet mechanism. When a pulse of current is applied to the coil, it generates a transient electromagnetic field that overcomes the holding force of the permanent magnet, driving the armature to slide or snap to the opposite state. Once switched, the permanent magnet holds the contacts in place indefinitely without drawing any electrical power.
This zero-power holding mechanism is vital for high-efficiency grid-tied operations, smart power distribution panels, and modern EV charging infrastructure. The technological roadmap of our latching relays emphasizes high contact load capacities (up to 120A/150A), minimal contact resistance (typically under 1 mΩ to reduce thermal generation), and extended switching lifespans exceeding 100,000 electrical operations under full load.
Advanced dual-coil and single-coil designs utilizing high-remanence NdFeB magnets. Optimizes the balance between holding force and pulse energy requirements for switching.
Contact points formulated with AgSnO2 (Silver Tin Oxide) and AgNi (Silver Nickel) to prevent welding under high capacitive and inductive surge currents.
Integrates heavy-gauge copper shunts and custom-molded busbars, pulling from our deep heritage in precision copper component production, maintaining stable internal temperatures.
How latching relays serve as the critical control element in macro energy and automated infrastructure.
| Sector Application | Required Rating | Core Functionality | Standard Compliance |
|---|---|---|---|
| Smart Metering & AMI | 60A - 120A, 250VAC | Bistable control for remote load shedding and reconnection in smart grids. | IEC 62055-31 UC3 UC2 |
| EV Charging Stations (Level 2/3) | 32A - 80A, 400VAC | Safe contact isolation with minimal thermal overhead during multi-hour high-power transfer. | IEC 61851-1, UL 2231 |
| Solar Inverters / PV Tie Systems | 40A - 100A, 800VAC | Grid decoupling switches that guarantee immediate isolation during safety shutoffs. | VDE-AR-N 4105 |
| Smart Home Automation & Lighting | 16A - 30A, 277VAC | Low consumption switching of commercial and residential LED and inductive loads. | UL 508, NEMA 410 |
Ningbo Taojun Refrigeration Equipment Co., Ltd. is located in Xiangshan, Ningbo, a beautiful tourist city. Founded in 1988, its predecessor was Xiangshan Refrigeration Accessories Factory of Zhejiang University. The company's leading products include: filter dries, check valves, air conditioning valves, condensers, brass and copper accessories, air conditioning cable ties and other refrigeration accessories series products. After 30 years of hard work and rapid development, it has now become a comprehensive enterprise integrating the design and development, production and sales, and after-sales service of refrigeration accessories. In 2021, it became a national high-tech enterprise. Our company is committed to technological and process innovation, equipment improvement, and the introduction of advanced management concepts to produce first-class products. Customer satisfaction is our unwavering pursuit. With reasonable design, reliable quality, and perfect after-sales service, the "Lingshan" filter has become a well-known brand in the domestic refrigeration industry. The company has successively passed ISO9001:2008 quality management system certification, EU ROHS environmental protection directive certification, and US UL certification. The company always takes customer needs as the basis and continuously innovates management concepts to ensure efficient and stable development.
In 2012, Ningbo Taojun Refrigeration Equipment Co., Ltd. was established, creating the brand "Taojun" condensers, "Taojun" stop valves and other series of products. Over the years, it has established partnerships with well-known domestic and foreign home appliance enterprises such as Haier, Xinfei, Midea, Gree, Whirlpool, Electrolux, and Huarui. The product sales network covers major and medium-sized cities in China and is exported to Europe, America, South America, Southeast Asia, the Middle East, Africa and other overseas markets. The company's goal is to support and cooperate with every sincere customer to achieve a win-win situation.
Taojun is specialized in refrigeration parts 38years. filter drier, access valve, condenser. Feature: TAOJUN copper filter driers are designed to absorb moisture and acid, and to filter out impurities. Normally be installed as component and replaced as repair part for both domestic and commercial refrigerators, freezers.
Integrating high-precision raw materials, academic collaboration, and MES execution systems for reliable global logistics.
Our Manufacturing Execution System (MES) ensures real-time production visibility from raw material copper extrusion to automatic relay coil winding. Traceability is guaranteed for every single batch via visual QR routing.
Leveraging our origins from the Xiangshan Refrigeration Accessories Factory of Zhejiang University, our active R&D center is staffed by 15 specialist engineers, including doctors and professors from the University of Science and Technology of China (USTC).
We source core components directly from premium origins: high-uniformity liquid crystal spacers and ITO films from Japan, specialized high-temp structural adhesives from Europe, and pure high-grade copper shunts internally manufactured to ensure complete supply chain resilience.
All functional materials and finished assemblies undergo intensive environment chambers testing to prevent field failures:
Our core manufacturing equipment is imported directly from Germany.
We have 15 engineers in our R&D centre, all of them are doctors or professors from University of Science and Technology of China.
Customized sizes and shapes are available. Welcome to share your idea with us, let’s work together to make life more creative.
Our ITO film (no shrinkage, no color difference) and liquid crystal spacer (excellent uniformity) are imported directly from Japan; glue is imported directly from Europe; our liquid crystal temperature range is 70°C and protective film is resistant to high temperatures 80-90°C.
High & low temperature test at 75°C and -35°C for 500 hours; thermal shock test 10°C-90°C for 30 minutes; damp heat test for 500 hours; moisture removed by oven; smart films in sheet are powered by a 24-hour aging test; smart films in roll are tested with 100V high voltage to make sure zero breakdown.
TAOJUN was established in 1988 and has been producing copper filter driers for 41 years (including predecessor history). We have domestic leading research and development ability in refrigeration parts, as well as industry-advanced level in refrigeration parts and quality control abilities. Since started, Taojun's competing ability is always considered to be technology.
Our Factory Building established to support localized industrial demands.
MES intelligent workshop management system integration to streamline assembly.
Global expansion and high-tech relay & refrigeration supply chain optimization.
A world brand is supported by a corporate culture. We fully understand that her corporate culture can only be formed through Impact, Infiltration and Integration. The development of our group has been supported by her core values over the past years: Honesty, Innovation, Responsibility, Cooperation.
Our group always adheres to the principle of people-oriented, integrity management, quality utmost, premium reputation. Honesty has become the real source of our group’s competitive edge.
Innovation:Innovation is the essence of our group culture. Innovation leads to development, which leads to increased strength. All originates from innovation in concept, mechanism, technology, and management.
Responsibility:Responsibility enables one to have perseverance. Our group has a strong sense of responsibility and mission for clients and society. It has always been the driving force for our development.
Cooperation:Cooperation is the source of development. We strive to build a cooperative group, working together to create a win-win situation as a key organizational goal.
Verified compliance for global commercial engineering pipelines.
Juntao Refrigeration (NINGBO TAOJUN REFRIGERATION EQUIPMENT CO., LTD.) stands as a globally recognized leader in the design and production of critical refrigeration components. With our official GB/T19001-2016/ISO9001:2015 certification (Registration No.: 41325Q00065R0S), we demonstrate uncompromising commitment to quality in manufacturing filter driers, condensers, and access valves.
This certification, verifiable via China’s CNCA (www.cnca.gov.cn) and our partner Zhongci International (www.zcgirz.com), validates our advanced OEM and ODM capabilities for clients worldwide. For partners seeking reliable refrigeration component solutions, Juntao delivers innovation, precision, and supply chain security from our ISO-certified facility in Zhejiang, China.
Main Certification Document
Detailed Scope of Certification
Critical engineering metrics and request-for-quote parameters for international procurement managers.
When selecting latching relays for large-scale deployments, procurement managers must evaluate several technical dimensions beyond cost. In smart grid projects, standardizing relay packages ensures mechanical compatibility across different meter housings. Key attributes to outline in your RFQ documents include:
| Procurement Spec Parameter | Standard Range Offerings |
|---|---|
| Insulation Resistance | Min. 1,000 MΩ at 500VDC |
| Dielectric Strength | 4,000VAC between coil & contacts |
| Custom Shunt Values | 100μΩ to 350μΩ tolerance +/-5% |
| Operating Pulse Width | 80ms to 150ms typical pulse excitation |
35+ years of R&D expertise with Zhejiang University collaboration.
ISO 9001, IATF 16949 certified; 5D quality system (0.05% defect rate).
50+ country network; partnerships with Haier, Midea, Whirlpool.
OEM/ODM support; 500-unit MOQ; 72-hour global delivery setup.
RoHS, REACH, WEEE certified; 100% recyclable packaging.
MES system, CCD visual inspection, helium leak testing.
98.6% satisfaction (2023); 24-hour complaint resolution.
±0.02mm aluminum foil tolerance; 10-year lifespan testing.
Smart product innovation; green manufacturing for industry sustainability.
Our solutions support several commercial applications including refrigeration control, heavy HVAC engineering, home automation, and smart metering grid infrastructures.
Explore our legacy products and precision filters.
Technical clarifications on magnetic latching relays, electrical ratings, and OEM integration parameters.
High-durability HVAC parts, condenser assemblies, and industrial pumps from our certified production lines.
Taojun