The utility model provides a direct current moulded case circuit breaker leaks current detection device, it includes direct current moulded case circuit breaker (1) and direct current hourglass electric sensor (2), its characterized in that of: the leading -out terminal and the direct current of direct current moulded case circuit breaker (1) leak electric sensor (2) and are connected, the directcurrent leaks electric sensor (2) including casing (201), be equipped with mutual -inductor (202) in casing (201), two conductors (203, 203') are passed mutual -inductor (202) and are connected with direct current moulded case circuit breaker (1) leading -out terminal. It is integrated to together with leakage current sensor power supply loop and order circuit that this leaks current detection device, for the remote monitoring provides real -time, accurate data, realizes and the breaker module installation. Not only improved the detection precision, it provides front end technical support to control for intelligence, but distribution system safety is effectively protected to alarm output signal when the circuit is unusual, it is loaded down with trivial details to overcome current hourglass electric sensor installation simultaneously, is difficult for shortcomings such as maintenance, has reduced the volume of whole product.