Zhejiang Siwei Electric Co., Ltd. is a high-tech enterprise.
The main products are temperature controllers, thermocouples, thermal resistor sensors, and relays, which are widely applied to scientific research, metallurgy, petrol, chemical engineering, light & textile Industry, plastic, food, and energy saving.

With strong R&D ability, experienced engineers, advanced production equipment and reliable inspecting equipment, Siwei has successfully awarded ISO9001:2000 quality system certificate and CE Certificate. Our products are widely sold in domestic or overseas markets.

SWJ1 series electronic multi-function productive devices are not only the latest electric protection relays originated by Siwei, but also are made with the self-development core technology and advanced production techniques, and show stable quality and practical functions. The products become the updated ones of common thermal relays.

Siwei insists on advanced technology, top products, considerate service and reasonable price, always carries out the quality method of excellent quality which can win broad markets, performs the culture of people oriented, and promotes the spirit of "respecting for science, honesty, practical or harmonious development". Siwei will struggle hard towards to constructing a modern enterprise with top scientific management, advanced technology and outstanding benefits.