Abstract: To address the issue of decreased reliability in power transmission caused by the incapability of existing parallel protection gaps to actively extinguish arcs, a method utilizing the power-flow current flowing through coil to generate a magnetic field, and employing electromagnetic force to drive a piston to compress air and jet high-speed airflow for arc extinction is proposed. Consequently, a double-ended electromagnetic air-blast segmented arc-extinguishing device is designed. Based on the theory of magnetohydrodynamic, the theoretical model is built by using finite element simulation software, and the arc-extinction process of the device is simulated and analyzed. The results show that the arc-extinguishing airflow maximum speed is up to 330 m/s. Arc-extinguishing airflow rapidly act on the arc from the upper and lower ends, under the action of high-speed airflow, the arc gradually thinned out to break the dynamic equilibrium. The arc column temperature decreases to 2 000 K within 3 ms, and the arc channel pinch off, so as to realize the ″no arc channel″. The arc-extinguishing time is only 9% of the time before the installation of the device. The device can greatly shorten the arc-extinguishing time, and improve the reliability of the power supply system.