The success of high-voltage DC circuit breakers（HVDC CB）will be a breakthrough in the development of multi-terminal DC transmission system and DC transmission net. Although much research has been devoted to HVDC CB

the high current breaking capability of HVDC CB is still limited at present. This paper proposes a new type of DC circuit breaker（DCCB）which is based on superconducting current-limiting technology that can extremely improve high short-circuit current interrupting ability. The DCCB consists of a superconducting current-limiting module and an interrupting module. This paper studies the fast-limiting characteristic of the superconductor current-limiting module

current transfer characteristic and the high-current withstand capability of superconducting tapes. Experimental results show that

this DCCB can limit current very quickly within 1 ms and can limit dozens or even one thousand kilo-ampere current to several thousand ampere due to its quick limiting characteristic. The superconducting module has a wide current-limiting capability after applying magnetic field to it. The proposed DCCB are effectively combined superconducting current-limiting technology and DC interrupting technology together. It can work under high DC voltage with very quick reaction. The proposed DCCB has an extremely high short-current interrupting capability and for this reason it is a promising HVDC CB.