Micro Door Switch iterates and upgrades, empowering multi-scenario safety control with technology

Yueqing, November 10, 2025 — Yueqing Tongda Wire Electric Factory, a veteran enterprise with 35 years of experience in switch manufacturing, recently announced that its Micro Door Switch series has completed a technical iteration. Leveraging independently developed patented technology for locking mechanisms, this series of products has achieved three major breakthroughs in safety protection and durability, and has been successfully applied in multiple fields such as household appliances, industrial equipment, and automotive electronics, becoming a core competitive product in the segmented market.

As a key component for equipment safety control, the Micro Door Switch is mainly used to detect the opening and closing status of doors and realize circuit on-off. It is widely applied in scenarios including refrigerator door light control, industrial equipment safety door interlocking, and automotive door status detection.

In terms of performance, this series of products has been specially optimized for different scenarios: The contacts are made of high-purity silver alloy, with an initial contact resistance of ≤30mΩ, an electrical lifespan of over 50,000 cycles, and a mechanical lifespan of up to 1,000,000 cycles, meeting the demand for high-frequency switching. The protection level is divided into IP40 basic version and IP67 waterproof version according to application scenarios. The waterproof version adopts a potting sealing process, which can resist the erosion of humid and dusty environments, making it suitable for harsh working conditions such as kitchen appliances and outdoor equipment.

Strict quality control runs through the entire production process. The products rely on a fully automated assembly line, with key dimensional errors controlled within ±0.02mm. Each finished product must pass 7 tests including high-low temperature cycle, durability pressing, and dust-proof and waterproof tests. Currently, the products have obtained international certifications such as UL, VDE, and CQC, comply with the IATF16949 automotive industry quality system standards, and maintain a 100% factory qualification rate.

The market application achievements are remarkable: In the household appliance field, the customized version supporting a well-known refrigerator brand realizes the precise linkage between door opening/closing and the lighting system, reducing the fault repair rate by 58%; In the industrial scenario, the version adapted for the safety door interlocking of semiconductor manufacturing equipment has passed the Semi standard certification, ensuring that the equipment automatically powers off when the cover is opened, helping customers improve the production safety factor; In the automotive electronics field, the model used for door status detection has undergone 18 months of actual vehicle testing without faults and has obtained bulk orders from automobile manufacturers.

"The iteration of the Micro Door Switch is another practice of us solving industry pain points with patented technology," said the enterprise's person in charge. In the future, the company will continue to focus on the miniaturization and high-reliability upgrade of micro switches, develop low-power and intelligent versions, and continuously expand emerging application scenarios such as smart homes and new energy.