A fault state indication device for a circuit breaker, comprising a contact group, a transmission assembly and an indication assembly which are mounted inside a housing. The contact group implements a normally open contact group and a normally closed contact group. The transmission assembly acts on a contact support (107), different open and closed states of the contact group are realized via the contact support. The indication assembly indicates a fault state, the indication assembly is linked with the circuit breaker, and carries out a corresponding state indication in response to a fault. The fault state indication device for a circuit breaker has a simple and reliable structure, a manufacturing process which is easier to implement. The fault state indication device can not only indicate the state and type of a load line failure, but also judge an operation state of the circuit breaker via the contact group.

A relay with high action reliability includes a base part and a movable part that is swingable relative to the base part. The movable part includes a movable contact piece, an armature, and a first plastic body, and the movable contact piece and the armature are assembled into an integral piece through the first plastic body. The movable contact piece includes a movable contact body and a soldering lug structure. The soldering lug structure includes a connecting portion and a soldering portion, and the soldering portion is connected to the movable contact body through the connecting portion. The soldering portion includes a first soldering structure and a second soldering structure that are soldered to the base part; and the first soldering structure and the second soldering structure are at a same side of the connecting portion in a length direction of the armature.