An electrical contact system, comprising: a pair of static contacts (610, 620); a rotatable member provided between the pair of static contacts (610, 620) and rotatable about a rotation axis between a first position and a second position; and a movable contact mounted on the rotatable member to be rotated with the rotatable member, wherein when the rotatable member is rotated to the first position, two ends of the movable contact are in electrical contact with the pair of static contacts (610, 620), respectively; and when the rotatable member is rotated to the second position, two ends of the movable contact are separated from the pair of static contacts (610, 620), respectively, and wherein the movable contact exhibits a Z-shape and is slidably mounted on the rotatable member, to allow the movable contact to slide, under pushing of a first static contact of the pair static contacts (610, 620), toward a second static contact of the pair of static contacts (610, 620) and be in electrical contact with the second static contacts; wherein the movable contact is adapted to slide from an initial position to an offset position under the pushing of the first static contact; and wherein the movable contact is kept in the offset position after the two ends (210, 220) of the movable contact are in electrical contact with the pair of static contacts (610, 620); and the movable contact is returned to the initial position after two ends (210, 220) of the movable contact are separated from the pair of static contacts (610, 620), characterized in that it further comprises a leaf spring mounted on the rotatable member, wherein the leaf spring is configured to automatically reset the movable contact to the initial position by its elastic reset force after the two ends (210, 220) of the movable contact are separated from the pair of static contacts (610, 620). a pair of static contacts (610, 620); a rotatable member provided between the pair of static contacts (610, 620) and rotatable about a rotation axis between a first position and a second position; and a movable contact mounted on the rotatable member to be rotated with the rotatable member, wherein when the rotatable member is rotated to the first position, two ends of the movable contact are in electrical contact with the pair of static contacts (610, 620), respectively; and when the rotatable member is rotated to the second position, two ends of the movable contact are separated from the pair of static contacts (610, 620), respectively, and wherein the movable contact exhibits a Z-shape and is slidably mounted on the rotatable member, to allow the movable contact to slide, under pushing of a first static contact of the pair static contacts (610, 620), toward a second static contact of the pair of static contacts (610, 620) and be in electrical contact with the second static contacts; wherein the movable contact is adapted to slide from an initial position to an offset position under the pushing of the first static contact; and wherein the movable contact is kept in the offset position after the two ends (210, 220) of the movable contact are in electrical contact with the pair of static contacts (610, 620); and the movable contact is returned to the initial position after two ends (210, 220) of the movable contact are separated from the pair of static contacts (610, 620), characterized in that it further comprises a leaf spring mounted on the rotatable member, wherein the leaf spring is configured to automatically reset the movable contact to the initial position by its elastic reset force after the two ends (210, 220) of the movable contact are separated from the pair of static contacts (610, 620).