Low-voltage hybrid DC circuit breakers

with their low conduction losses

high interruption capabilities

and selective protection

constitute a key direction for the development of DC interruption technology. To meet the application demands for large-capacity interruption

it is essential to further enhance their working reliability. Firstly

this paper analyzes the interruption characteristics of a self-triggered low-voltage hybrid DC circuit breaker under different short-circuit conditions. To address the issue of pronounced current tailing at high voltage levels

a current transfer strategy based on the desaturation detection circuit is proposed. This strategy enables the protection circuit to operate periodically without external sensors

thereby maximizing the current-carrying capacity of the device. By integrating the temperature rise assessment method based on the Foster thermal network model

a design method for optimal timing coordination between mechanical and electronic systems is established. Finally

experimental results indicate that compared with mechanical circuit breakers

hybrid interruption technology can effectively reduce arc duration and arc energy. The current transfer strategy proposed in this paper can significantly shorten the duration of the tail current and is applicable. The research results provide important references for the design optimization and performance improvement of low-voltage hybrid DC circuit breakers.