YM Tech

YM Tech makes relays, electrically operated switches that use an electromagnet to open or close a circuit, allowing a small control signal to manage a much larger flow of power.

Its products are supplied into energy storage systems, electric-vehicle chargers, electric vehicles, and solar inverters, as well as trains, rectifiers, lighting controls, and defence applications such as missiles and naval vessels. Listed on KOSDAQ, Korea's tech-focused small-cap exchange, the company's core business centres on direct-current high-voltage relays, with proprietary technologies covering bidirectional arc suppression, contact-status monitoring, and high-capacity design.