The invention discloses a relay. The relay comprises a housing, a bottom plate, a fuse, a push mechanism and a detection assembly. The housing has two connection posts which are insulated from each other; two contact points corresponding to the connection posts are arranged on the bottom plate and the two contact points are insulated from each other; the bottom plate is arranged between a conducting position where the two contact points and the two connection posts are respectively connected and a disconnection position where the two contact points are disconnected from the two connection posts and is movably arranged inside the housing; the fuse is arranged on the bottom plate and is connected to the two contact points; the push mechanism is connected to the bottom plate in order to drive the bottom plate to move between the conducting position and the disconnection position; the detection assembly comprises an auxiliary moving contact bridge and an auxiliary static contact bridge; the auxiliary moving contact bridge is connected to the push mechanism; the auxiliary static contact bridge is arranged on the housing; when the bottom plate is in the conducting position, the auxiliary moving contact bridge is conducted with the auxiliary static contact bridge; and the auxiliary moving contact bridge is disconnected from the auxiliary static contact bridge when the bottom plate is in the disconnection position. According to the relay of the invention, the arrangement of the fuse makes the relay have both an over current protection function and a breaker function. The detection assembly can improve safety of the relay.