Engineered for maximum reliability and seamless safety integration with advanced thermal protection systems
Ningbo Taojun Refrigeration Equipment Co., Ltd. is located in Xiangshan, Ningbo, a highly connected, industrialized industrial hub. Founded in 1988, our company's predecessor was the prestigious Xiangshan Refrigeration Accessories Factory of Zhejiang University. Harnessing decades of academic-backed engineering and material science expertise, we have evolved into a national high-tech enterprise integrating the custom design, R&D, manufacturing, and global distribution of refrigeration accessories and circuit protection systems.
Over our 30+ year trajectory, we have built key partnerships with domestic and foreign home appliance conglomerates including Haier, Xinfei, Midea, Gree, Whirlpool, Electrolux, and Huarui. Our product sales networks span across Europe, the Americas, Southeast Asia, the Middle East, and Africa, driven by our corporate core values: Honesty, Innovation, Responsibility, and Cooperation.
Years Industry Experience
R&D PhD & Academic Experts
Countries Exported To
Low PPM Defect Rate
In high-performance refrigeration and HVAC systems, compressor thermal overload is a primary driver of motor winding breakdown and safety hazards. As motors face voltage fluctuations, starting issues, or operating blockages, internal temperatures surge. A high-sensitivity thermal protector functions as the system's emergency line of defense, shutting down operations before catastrophic winding failure occurs.
As a leading supplier, Ningbo Taojun designs components that form an integrated safety loop: from copper filter driers that purge moisture and acids (preventing compressor drag) to precision-calibrated thermal protector mechanisms, every stage of our supply chain supports global home appliance networks. Our thermal safety components ensure zero leakage, high contact endurance, and rapid heat response.
Our bimetallic snap-action thermal protectors utilize high-sensitivity alloy discs imported from industry-standard global suppliers. These snap-action components instantly break electrical contact during over-temperature or over-current states, resetting automatically once safe operating conditions return.
A major cause of thermal overload is refrigerant breakdown due to system impurities. Our copper filter driers feature 3A molecular sieves (water absorption ≥20%) combined with activated alumina to capture corrosive elements, reducing motor resistance and compressor stress.
By protecting winding insulation from high heat, our components extend system life. We conduct endurance testing under heavy load and thermal shock cycling from -35°C to 75°C for 500 hours, verifying zero mechanical failures.
Ningbo Taojun's facilities are engineered for smart manufacturing, quality assurance, and high volume flexibility, ensuring reliable production at scale.
Our core production systems and precision testing devices are imported directly from Germany, providing sub-micron tolerances for complex component assembly.
Collaborations with Zhejiang University and the University of Science and Technology of China empower our 15-engineer R&D department to innovate custom thermal protector shapes, sizes, and trip profiles.
We deploy high-voltage insulation tests, helium mass spectrometer leak detection, and advanced visual check systems to maintain our certified ≤0.05% PPM field failure rate.
Our plant operates under certified ISO 9001:2015 and IATF 16949 quality guidelines. Our products are fully compliant with EU RoHS, REACH, and US UL directives, supporting seamless entry into target markets.
Our Manufacturing Execution System (MES) provides end-to-end trace capability from raw copper feedstocks to finished hermetic components, ensuring reliable documentation for international audits.
We configure custom trip temperatures, electrical load limits, housing geometries, and termination leads. Our streamlined production allows us to offer 500-unit MOQs and rapid prototyping cycles.
Ningbo Taojun components protect critical HVAC/R machinery across residential, commercial, and industrial platforms.
Protects single-phase hermetic compressors against startup overloads. Integrated copper filter driers protect capillaries from freezing and clogging.
Manages thermal stability in split, ducted, and VRF HVAC networks. Our heavy-duty contactors and filter driers handle high pressures with zero refrigerant loss.
Automotive-grade copper connections and compact thermal cutoffs protect electric compressor drives from thermal runaway under fast-charging conditions.
Heavy-duty safety valves and solid-core molecular sieve filter driers protect scroll/screw compressors in harsh, high-vibration manufacturing environments.
As an ISO 9001:2015 certified manufacturer (Registration No.: 41325Q00065R0S), Ningbo Taojun undergoes regular third-party audits. This verification, traceable via China's CNCA database and partner platforms, confirms that our manufacturing meets rigorous international standards.
Our quality verification processes check every stage of production, from raw material inspection to final product testing:
Detailed technical answers addressing core design, selection, and maintenance considerations for refrigeration and HVAC components.
A bimetal thermal protector uses two metals with different rates of thermal expansion bonded together. When temperature or current exceeds a pre-set threshold, the bimetal disc changes shape, opening the contacts to cut power. Once the motor cools, the disc snaps back, restoring the circuit. Our designs use high-grade alloys to prevent drift in calibration temperature over tens of thousands of cycles.
Moisture reacts with refrigerants and POE/PAG oils to form hydrochloric and hydrofluoric acids, which degrade motor winding insulation and cause mechanical wear. This increases current draw and heats the compressor, eventually triggering the thermal protector. Our 3A molecular sieve filter driers absorb this moisture to protect winding insulation and mechanical surfaces.
We perform burst tests on copper valves and filter driers using hydraulic systems at pressures up to 100 bar, depending on safety parameters. We also conduct helium mass spectrometer leak detection and thermal shock tests from -35°C to 75°C to ensure reliable sealing in demanding environments.
Yes. Our engineering division works with Zhejiang University research teams to design custom thermal protectors with calibrated trip temperatures, response profiles, current capacities, and mounting methods to match your specific motor assembly.
Our MES records parameters for each production step, including welding temperature, bimetal calibration, vacuum levels, and leak check results. This provides complete trace documentation from raw materials to final packaging, supporting quality auditing for international OEMs.
When sealed in original vapor-barrier packaging, our copper filter driers have an indefinite shelf life. Once brazed into a closed, sealed refrigeration loop, they are designed to match the lifetime of the compressor, typically 10 to 15 years, provided the system is not opened or contaminated.
Broadening safety profiles and system control with advanced copper piping and power controls
Taojun