Changyou Technology (Zhejiang) Co., Ltd. is a professional electrical technology company specializing in circuit protection, smart power control, and intelligent distribution solutions.
With roots dating back to 1993, the "tongou" brand has built strong expertise in traditional circuit protection devices, including ELCB, MCB, RCCB, RCBO, Switch-Disconnector, Distribution Box, MCCB, ACB, photovoltaic protection devices, and EV charging protection solutions.
In 2021, Changyou Technology launched the "chayo" brand to further expand into the smart electrical sector. Chayo focuses on smart circuit breakers, DIN-rail smart switches, smart gateways, intelligent energy monitoring, AI smart distribution systems, and integrated AI-powered power management solutions.
From reliable mechanical protection to intelligent AI-driven electrical systems, Changyou Technology is committed to connecting traditional electrical safety with the future of smart energy management, delivering advanced solutions for homes, businesses, industry, solar energy, and new energy infrastructure.

• More than 10,000 square meters of factory area
• Fast production delivery capability
• Professional technical information and customized services
• Provide OEM processing, ODM research and development services
• Professional technology and sales team to solve customer problems – just ask!

Johnson Lim

CEO