A DC circuit breaker comprising: a first terminal unit connected to a power source, wherein the first terminal unit includes a pair of first terminals (121, 123) and at least one first connection portion, wherein the pair of first terminals (121, 123) includes a pair of first positive terminals and a pair of first negative terminals, wherein the at least one first connection portion is configured to connect the pair of the first positive terminals in parallel to each other and to connect the pair of the first negative terminals in parallel to each other; and a second terminal unit connected to the first terminal unit and connected to a load, wherein the second terminal unit includes a pair of second terminals (131, 133) and at least one second connection portion, wherein the pair of second terminals (131, 133) includes a pair of second positive terminals and a pair of second negative terminals, wherein the second connection portion is configured to connect the pair of second positive terminals in parallel to each other and to connect the second negative terminals in parallel to each other; characterized by a third terminal unit configured to connect the first terminal unit and the second terminal unit, wherein the third terminal unit includes at least two pairs of third positive terminals, at least two pairs of third negative terminals, two third connection portions, and two fourth connection portions, wherein the at least two pairs of third positive terminals are connected to a first positive terminal and to a second positive terminal, respectively, and wherein the at least two pairs of third negative terminals are connected to a first negative terminal and to a second negative terminal, respectively, wherein a first of the two third connection portions is configured to connect the at least two pairs of third positive terminals in parallel to each other to form two groups, and wherein a second of the third connection portions is configured to connect the at least two pairs of third negative terminals in parallel to each other to form two groups; wherein a first of the two fourth connection portions is configured to connect the two groups of the third positive terminals in parallel to each other, and wherein a second of the fourth connection portions is configured to connect the two groups of the third negative terminals in parallel to each other. a first terminal unit connected to a power source, wherein the first terminal unit includes a pair of first terminals (121, 123) and at least one first connection portion, wherein the pair of first terminals (121, 123) includes a pair of first positive terminals and a pair of first negative terminals, wherein the at least one first connection portion is configured to connect the pair of the first positive terminals in parallel to each other and to connect the pair of the first negative terminals in parallel to each other; and a second terminal unit connected to the first terminal unit and connected to a load, wherein the second terminal unit includes a pair of second terminals (131, 133) and at least one second connection portion, wherein the pair of second terminals (131, 133) includes a pair of second positive terminals and a pair of second negative terminals, wherein the second connection portion is configured to connect the pair of second positive terminals in parallel to each other and to connect the second negative terminals in parallel to each other; characterized by a third terminal unit configured to connect the first terminal unit and the second terminal unit, wherein the third terminal unit includes at least two pairs of third positive terminals, at least two pairs of third negative terminals, two third connection portions, and two fourth connection portions, wherein the at least two pairs of third positive terminals are connected to a first positive terminal and to a second positive terminal, respectively, and wherein the at least two pairs of third negative terminals are connected to a first negative terminal and to a second negative terminal, respectively, wherein a first of the two third connection portions is configured to connect the at least two pairs of third positive terminals in parallel to each other to form two groups, and wherein a second of the third connection portions is configured to connect the at least two pairs of third negative terminals in parallel to each other to form two groups; wherein a first of the two fourth connection portions is configured to connect the two groups of the third positive terminals in parallel to each other, and wherein a second of the fourth connection portions is configured to connect the two groups of the third negative terminals in parallel to each other. wherein the at least two pairs of third positive terminals are connected to a first positive terminal and to a second positive terminal, respectively, and wherein the at least two pairs of third negative terminals are connected to a first negative terminal and to a second negative terminal, respectively, wherein a first of the two third connection portions is configured to connect the at least two pairs of third positive terminals in parallel to each other to form two groups, and wherein a second of the third connection portions is configured to connect the at least two pairs of third negative terminals in parallel to each other to form two groups; wherein a first of the two fourth connection portions is configured to connect the two groups of the third positive terminals in parallel to each other, and wherein a second of the fourth connection portions is configured to connect the two groups of the third negative terminals in parallel to each other.