Ningbo Taojun Refrigeration Equipment Co., Ltd. (known globally as Juntao Refrigeration) is situated in the industrial hub of Xiangshan, Ningbo, China. Established in 1988, our operational DNA stems from the prestigious Xiangshan Refrigeration Accessories Factory of Zhejiang University. This academic linkage paved the way for decades of technological breakthroughs in thermodynamic cycle control and high-performance electro-mechanical switching.
Over the last 30+ years, our engineering groups have evolved from manufacturing high-end copper filters, check valves, and air conditioning valves, into developing integrated intelligent control components. Today, we represent the nexus of manufacturing reliability and next-generation power management, supplying critical elements to the world's most demanding refrigeration, home appliance, and automation sectors. In 2021, our R&D focus and execution earned us the designation of a National High-Tech Enterprise.
Our commitment to rigorous design and precision engineering has established our domestic brand "Lingshan" as a hallmark of quality. Today, our international portfolio serves home appliance giants and industrial buyers across five continents.
As global regulatory frameworks mandate higher energy efficiency (SEER/SCOP standards), refrigeration compressors and variable-frequency HVAC systems demand advanced electronic control interfaces. High-speed relays have become essential components, allowing rapid microsecond-range response times to protect compressors, switch defrost timers, and manage peak electrical loads.
Modern air conditioning inverter PCBs use high-speed power relays to manage phase switching and isolate power components. Our engineering aligns relay performance with control system logic, minimizing contact bounce and system latency.
Compressor motor start operations create large inrush currents. High-speed magnetic and solid-state relays isolate downstream electronics, extending system lifetime under fluctuating electrical loads.
Our control components integrate low-power coils and customized magnetic latching mechanisms. This minimizes continuous power loss in B2B systems, aligning with eco-design and ESG goals.
As an OEM/ODM provider, Juntao Refrigeration ensures that control systems integrate seamlessly with mechanical assemblies like filter driers, condensers, and compressors. We source premium raw materials and follow strict processing standards to ensure reliable high-speed switching.
| Performance Metrics | High-Speed Relay Specifications | HVAC/R System Integration Benefits |
|---|---|---|
| Switching Latency | < 5 ms (Milliseconds) response window | Prevents voltage sags on AC inverter microcontrollers. |
| Dielectric Strength | Over 4,000 VAC between coil and contacts | Protects controllers from high-voltage transients. |
| Mechanical Operations | Tested for > 10,000,000 cycles | Extends system lifespan beyond 10 years. |
| Contact Resistance | < 30 mΩ (milliohms) initial resistance | Reduces heat generation on crowded PCB trace layouts. |
| Thermal Range | Operational from -40°C up to +105°C | Reliable performance inside compressor terminals. |
We tailor contact configurations, pin layouts, and coil resistances to match your specific inverter PCB layouts.
Using our research connection with Zhejiang University, we design and produce pre-production samples within 15 working days.
Automated manufacturing lines ensure consistent product quality, backed by a production capacity of millions of units annually.
We manage a unified supply chain that delivers mechanical components alongside electronic control assemblies. Our 35+ years of refrigeration experience ensures that our components match the performance requirements of commercial refrigeration and home appliances.
Our core production equipment is imported from Germany, ensuring precise assembly tolerances down to the micrometer level.
We retain 15 R&D engineers, including professors and researchers from the University of Science and Technology of China and Zhejiang University.
Our components undergo 500-hour environmental tests, thermal shock testing between -35°C and 75°C, and electrical aging tests.
We source high-purity copper, Japanese liquid crystal spacers, and European specialized adhesives to ensure stable, long-term performance.
We are transitioning from standard electro-mechanical components to smart, network-integrated switching hardware, helping our global partners prepare for future efficiency regulations.
We are phasing out heavy-metal contact formulations in favor of silver-alloy alternatives, ensuring full compliance with RoHS and REACH standards.
We are combining defrost timers, thermostats, and solid-state high-speed switches into a single control block to reduce HVAC cabling complexity.
We are developing relays with built-in current sensing, allowing them to monitor switching operations and report system wear before failures occur.
Our operations are certified under the GB/T19001-2016 / ISO9001:2015 quality management standard (Registration No. 41325Q00065R0S). Our certifications are verifiable through the Certification and Accreditation Administration of China (CNCA) and Zhongci International (ZCGIRZ).
ISO 9001 Certificate
Scope of Certification
UL Safety Approval
EU Compliance (RoHS/CE)
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