The utility model discloses a relay which comprises a relay body, a casing and a circuit unit, wherein the casing matches the relay body, and the circuit unit is packaged in the relay body. The relay body comprises a coil rack, the coil rack is internally provided with a skeleton, one side of the skeleton is provided with a groove, the groove is internally provided with an armature, and a return spring is arranged at the bottom of the armature and placed in the groove. The relay has the advantages that good contact of the armature is ensured due to arrangement of the armature, the casing arranged outside the relay body further ensures the isolation effect, the relay is safer, and the relay is characterized by simple manufacture and the like.