An electromagnetic switch including a first stationary electric contact, a second stationary electric contact, a mechanical contact, and a moveable contact. The electromagnetic switch is configured for reciprocal motion of the moveable contact into and out of contact with the first stationary electric contact and the second stationary electric contact, wherein the moveable contact remains in contact with the mechanical contact (e.g., a non-conducting contact) throughout the reciprocal motion. In various embodiments, the moveable contact is configured so that at the end of the reciprocal motion three contact points occur, and a triangle defined by the three contact points encloses a center of force of the reciprocal motion.

An electromagnetic relay unit includes an electromagnetic relay; a socket that connects the electromagnetic relay to a mount board; a first terminal provided at the electromagnetic relay and including a first plate portion; and a second terminal provided at the socket to be connectable with the first terminal, and including a second plate portion, the first plate portion and the second plate portion being provided to face with each other when the electromagnetic relay and the socket are connected with each other, at least one of the first plate portion and the second plate portion including a projection that contacts the other of the first plate portion and the second plate portion.

An electromagnetic switch includes: at least two stationary electric contacts; and a moveable contact, wherein the electromagnetic switch is configured for reciprocal motion of the moveable contact into and out of contact with the stationary electric contacts, wherein the moveable contact is configured so that at least three contact points occur in the reciprocal motion, and so that a triangle defined by the at least three contact points encloses a center of force of the movement.

An electromagnetic relay includes an electromagnet, an armature configured to be attracted and moved by the electromagnet, and a contact. The contact includes a fixed contact, a movable contact that is brought into contact with and moved away from the fixed contact by the movement of the armature, and a porous part that is formed of a porous metal.

A switchgear includes a stationary contact, a movable contact able to be shifted between a closed position and an opened position, an electromagnetic actuator able to generate power for shifting the movable contact, the electromagnetic actuator including a stator and a movable element, and a power transmission unit able to shift the movable contact, and to press the movable contact against the stationary contact. The power transmission unit includes a drive unit-side spring bearing portion able to be shifted together with the movable element, a contact-side spring bearing portion to be opposed to the drive unit-side spring bearing portion, and able to be shifted together with the movable contact, and a spring member provided between the drive unit-side spring bearing portion and the contact-side spring bearing portion.

An electromagnetic relay includes a base, a casing, a coil, a movable contact piece and two fixed contact pieces. Each of the fixed contact pieces includes a plate-shaped base. A portion of one side of the plate-shaped base extends outward and is bent to form a fixed contact fixing part. The fixed contacts are arranged on the fixed contact fixing part, and an abdicating through hole is defined in the base. The plate-shaped bases of the fixed contact pieces are respectively connected to an outer side surface of the base and spaced from each other. Each of the fixed contact fixing parts protrudes through the abdicating through hole and located between the base and the casing. Each of the fixed contacts faces to the movable contact on the movable contact piece, and a portion of the plate-shaped base on the fixed contact piece protrudes out of the casing to form a connecting part.

In some embodiments, a DC relay includes a pair of fixed contacts fixedly installed on one side of a frame, a movable contact movably installed below the pair of fixed contacts and brought into contact with the pair of fixed contacts or separated therefrom, an insulating plate installed below the movable contact, a contact spring provided between the movable contact and the insulating plate, a plate installed below the insulating plate and including a through hole formed in a central portion thereof, a fixed core inserted from above the plate through the through hole and including a shaft hole formed at the center thereof, an anti-noise pad provided between the fixed core and the insulating plate, a movable core installed to be linearly movable below the fixed core, and a shaft installed to penetrate through the through hole.

An electromagnetic relay including: an electromagnet; an armature that swings by energization and non-energization of the electromagnet; a first fixed terminal on which a first fixed contact is mounted; a first movable spring on which a first movable contact opposite to the first fixed contact is mounted, and that is fixed to the armature; a second movable spring that moves along with the first movable spring in response to the swinging of the armature; and an elastic member that is mounted on at least one of the first movable spring and the second movable spring, and is disposed between the first movable spring and the second movable spring.

A contact apparatus includes a fixed contact and a moving contact component. The moving contact component includes a push rod, a contact bracket, an insulated sleeve, a moving contact, and a contact spring. The insulated sleeve is fixedly sleeved on a first end of the push rod, a second end of the push rod is configured to connect a drive apparatus, the contact bracket is fixedly sleeved on the insulated sleeve, the moving contact and the contact spring are both flexibly sleeved on the insulated sleeve, the contact spring elastically abuts between the moving contact and the contact bracket, the moving contact and the fixed contact are disposed relative to each other in an extension direction of the push rod, and the moving contact can be driven by the push rod to be connected to the fixed contact.

A connecting device for conduits or hose lines comprising a connecting body which has a borehole for conducting a medium flowing through the conduit or hose line therethrough, and a pipe-like end piece which can be inserted into a receptacle that is formed at the front end of the connecting body and which can fixed in said receptacle by means of a union nut that is arranged rotatably between a loosened position and an assembly position on the outside of the connecting body, wherein a display rendering the assembly state of the connecting device is arranged between the mutually facing end faces of the union nut and connecting body, is characterized in that the display consists of two annular display bodys (13, 14) as carriers of at least one marking in each case, each display body being formed at the end faces of the connecting body (10) and union nut (12), whereby at the start of assembly of the union nut (12) the markings of the two displays bodys (13, 14) are located at different locations on the circumference of the connecting body (10) and union nut (12) and when the assembly of the connecting device is completed, they are moved into a mutually agreeing position by the relative rotation of the two display bodys (13, 14) relative to each other that takes place when the union nut (12) is screwed on.