The high-speed interrupter in an existing fuse is usually driven by shock wave generated by explosive detonation. There are some defects in the practical application of explosive

such as strong destructive power

high noise and high price. In addition

the structure design of explosive type interrupter is complex

and this type of interrupter is of large volume and heavy weight. To solve the problems of explosive type interrupter

a new type of interrupter scheme in which the propellant-assisted interrupter（PAI） works by burning is designed in this paper. In order to obtain the design basis and optimization principle of PAI

a thermoelectric coupling model and a non-linear dynamic model are established to analyze the influences of component size on its temperature rise and interruption characteristics. Some optimized parameters are achieved through simulations. Finally

a prototype of 800 V/300 A rated device is designed for temperature rise and interrupting tests. The terminal temperature rise of the prototype under rated current is only 39 K

and the power consumption is 3.7 W. PAI has a breaking time of 144 μs and an average breaking speed of 18.5 m/s. The results agree with the simulation ones which can be used to design PAI.