Import Constant Current Ac Power Supply An77 — Buy in Bulk from Supplier in China

The Ainuo Instrument AN77 is a digital variable frequency AC power supply designed to deliver stable constant current output under low-voltage, high-load conditions. It operates with an output frequency range of 45 to 65 Hz and supports real-time adjustment of current and frequency during operation. Voltage measurement accuracy is typically within ±0.5%, and current regulation is maintained even when load impedance drops to near-zero, enabling safe short-circuit testing without damage to the unit.

The unit uses IGBT-based intelligent output technology to generate a pure sine wave, minimizing harmonic distortion and ensuring compatibility with sensitive test equipment. It includes built-in measurement of voltage, current, frequency, and active power, with memory retention for power-off states and key-lock functionality to prevent accidental changes. Standard RS232 is provided for data logging, with optional RS485 or remote control interfaces available for integration into automated test systems.

This power supply is primarily used by transformer and inductor manufacturers, quality inspection labs, and certification bodies to validate the performance of air circuit breakers, contactors, and low-voltage distribution systems under high-current stress. Buyers typically order in single-unit quantities for lab use, with lead times of 15 to 25 days depending on configuration. Packaging includes industrial-grade foam-lined crates with anti-static components, and units are shipped FOB Qingdao port with standard export documentation.

Ainuo Instrument is based in Qingdao, Shandong Province, and specializes in the design and manufacturing of precision test equipment for electrical components. The company is registered as a harbor-tier supplier with verified business credentials, though no certifications such as ISO or CE are stated in the listing. Response rate and average response time are not tracked, indicating limited or manual customer service capacity.

The supplier does not claim any export history, client names, production volume, or years in operation. It appears to focus on custom and semi-custom power supply units rather than mass-market products. No factory photos, team size, or R&D capabilities are disclosed. The listing reflects a niche technical vendor rather than a large-scale manufacturer.