In order to overcome problems that a contact of a current relay is not conducted in a conducting process or the contact of the current relay is still connected when supposing to disconnect and then a relay failure is caused. The invention provides a relay comprising an insulation housing, two static contact bridges, a moving contact bridge, a driving shaft and a driving structure; the relay also comprises an auxiliary detection structure; the auxiliary detection structure also comprises two auxiliary terminals arranged on a ceramic housing, a first conductive elastic sheet and a second elastic sheet which are disconnected from each other; the first conductive elastic sheet and the second conductive elastic sheet are arranged inside the insulation housing and are electrically connected to two auxiliary terminals; the driving shaft moves upwardly to drive the moving contact bridge to conduct with the static contact bridge while the driving shaft raises up the first conductive elastic sheet to make the first conductive elastic sheet conduct with the second conductive elastic sheet; the driving shaft moves downwardly to drive the moving contact bridge to disconnect from the static contact bridge while the driving shaft is disconnected from the first conductive elastic sheet to make the first conductive elastic sheet disconnect from the second conductive elastic sheet. The relay of the invention can quickly detect faults through an externally-connected auxiliary detection circuit of the auxiliary detection structure.