A relay comprising: a housing; static contact bridges, arranged on the housing; a moving contact bridge, movably arranged in the housing between a conduction position where the moving contact bridge is conducted with the static contact bridges and a disconnection position where the moving contact bridge is disconnected from the static contact bridges; a pushing mechanism, connected with the moving contact bridge and used for pushing the moving contact bridge to move between the conduction position and the disconnection position; and wherein the relay further comprises a detection assembly through which whether the static contact bridges and the moving contact bridge of the relay are conducted is detected, comprising an auxiliary moving contact bridge and an auxiliary static contact bridge, wherein the auxiliary moving contact bridge is connected with the pushing mechanism, the auxiliary static contact bridge is arranged on the housing, the auxiliary moving contact bridge is connected with the auxiliary static contact bridge when the moving contact bridge is at the conduction position, and the auxiliary moving contact bridge is disconnected from the auxiliary static contact bridge when the moving contact bridge is at the disconnection position, characterized in that the auxiliary moving contact bridge is an elastic sheet, the auxiliary static contact bridge comprises two wires arranged at an interval, and the elastic sheet conducts the two wires when the moving contact bridge is at the conduction position, wherein the housing is formed with through holes, a metalized layer is formed on the inner surfaces of the through holes, and the wires are inserted into the through holes and electrically connected with the metalized layer, wherein the housing is welded with the wires into a whole. a housing; static contact bridges, arranged on the housing; a moving contact bridge, movably arranged in the housing between a conduction position where the moving contact bridge is conducted with the static contact bridges and a disconnection position where the moving contact bridge is disconnected from the static contact bridges; a pushing mechanism, connected with the moving contact bridge and used for pushing the moving contact bridge to move between the conduction position and the disconnection position; and wherein the relay further comprises a detection assembly through which whether the static contact bridges and the moving contact bridge of the relay are conducted is detected, comprising an auxiliary moving contact bridge and an auxiliary static contact bridge, wherein the auxiliary moving contact bridge is connected with the pushing mechanism, the auxiliary static contact bridge is arranged on the housing, the auxiliary moving contact bridge is connected with the auxiliary static contact bridge when the moving contact bridge is at the conduction position, and the auxiliary moving contact bridge is disconnected from the auxiliary static contact bridge when the moving contact bridge is at the disconnection position, characterized in that the auxiliary moving contact bridge is an elastic sheet, the auxiliary static contact bridge comprises two wires arranged at an interval, and the elastic sheet conducts the two wires when the moving contact bridge is at the conduction position, wherein the housing is formed with through holes, a metalized layer is formed on the inner surfaces of the through holes, and the wires are inserted into the through holes and electrically connected with the metalized layer, wherein the housing is welded with the wires into a whole.