A contact slide unit for a switch unit, where the contact slide unit includes a contact slide with a switching piece displaceably guided therein, and method for mounting the contact slide unit, where the displaceable switching piece is protected on the contact slide against twisting via a separately formed anti-twist stop.

The present invention is directed to an electrical wiring device that includes a test circuit that is configured to generate a recurring simulated fault signal. A detection circuit is configured to generate a test detection signal in response to the recurring simulated fault signal. An end-of-life monitor circuit is configured to generate an end-of-life detection signal if the test detection signal is not generated within a first predetermined period of time. At least one indicator is configured to emit an indication signal in response to the end-of-life detection signal. A response mechanism is configured to decouple the plurality of line terminals from the plurality of load terminals after a second predetermined period of time has elapsed following the end-of-life detection signal.

An interrupter module (10) of a molded case circuit breaker (2) includes two stationary electrical contacts (20), and a blade carrier assembly (100) with a blade assembly (130) and a carrier (160) for the blade assembly. The blade assembly includes two conductive blades (140A, 140B). Each blade includes a movable electrical contact (150A, 150B) for engaging a corresponding stationary electrical contact in a closed position and for disengaging from the corresponding stationary electrical contact in an open position. Each blade has an independent over travel and contact force to maintain contact between the movable electrical contacts and corresponding stationary electrical contacts in the closed position.

A switch unit, preferably implementing a circuit breaker, includes a contact slide unit formed by a contact slide, a fixed contact piece and a moveable contact piece), and a short-circuit release that acts to displace the moveable contact piece by means of a tappet in the event of a short-circuit. A moveable braking device is configured and arranged such that, following circuit opening displacement of the moveable contact piece in response to a short-circuit, the moveable brake device dampens the return, rebound movement of the moveable contact piece to reclose the circuit.

Two electric poles are controlled in one and the same circuit breaker by an undivided opening mechanism controlled by a pyrotechnic actuator. The opening of the circuit that is brought about by this actuator, which is fast for a large opening travel of the mobile contacts, makes it possible to extinguish electric arcs under good conditions. The poles may be placed in series on one and the same electrical circuit in order to reduce the potential difference across the terminals of each of them, thereby further increasing the effectiveness of the circuit breaker in terms of arc extinguishing.

An electrical switch unit for use in an electrical device to control flow of electrical current therethrough from a power source to power the electrical device, the electrical switch unit comprising: a fixed electrical contact and a movable electrical contact, said movable electrical contact being configured for movement relative to the fixed electrical contact between an ON position in which the movable electrical contact is in contact with the fixed electrical contact wherein electrical current is able to flow from the power source therethrough to power the electrical device, and, an OFF position in which the movable electrical contact is out of contact with the fixed electrical contact wherein electrical current from the power source is not able to flow from the power source therethrough to power the electrical device; a contact mover movably coupled to a terminal member, the contact mover being configured for movement relative to the terminal member so as to move the movable electrical contact between the ON position and the OFF position; and a biasing member coupling the contact mover and the terminal member together such that said biasing member is configured to act upon the contact mover as the contact mover moves the movable electrical contact relative to the fixed electrical contact between the ON position and the OFF position; wherein when the movable electrical contact is arranged in the ON position, electrical current is able to flow along an electrical current path comprising the terminal member, the contact mover and the movable electrical contact in series, and, wherein an electrical insulation member is arranged in series with the biasing member between the contact mover and the terminal member whereby said electrical insulation member electrically insulates the biasing member from electrical current flow therethrough when the movable electrical contact is arranged in the ON position.

An electrical switch element is disclosed. The electrical switch element includes a housing having a switch chamber, an opening to the switch chamber, electrical switch contacts arranged in the switch chamber, and at least one positive-locking counter-element extending at least partially around the opening. The electrical switch element also includes a cover having at least one positive-locking element engaging the at least one positive-locking counter-element, the cover extending over the opening.

The disclosure relates to a contact slide unit for a switching unit, including a contact slide inside which a movable contact piece is guided, wherein the contact piece is biased from one side by a contact load spring. The disclosure also relates to a method for assembling the contact slide unit. The disclosure is characterized in that the movable contact piece is mounted in a winding interstice between two windings of the contact load spring.

A circuit breaker housing assembly is disclosed. The housing (47) includes a first housing piece (14) defining a first interior surface (52) including a first mating surface (152), and a second housing piece (60) defining a second interior surface (62) including a second mating surface (260) which is opposingly coupled to the first mating surface to define a seam (202) therebetween. An adhesive material (201) is disposed between the corresponding first and second mating surfaces along the seam. A moveable contact is disposed in the housing and is selectively moveable with respect to a corresponding stationary contact. The first and second interior surfaces (52,62) further cooperatively define a first recess (120) therebetween, and the moveable contact assembly is disposed in said first recess.

A contact module for a circuit breaker is disclosed, comprising: a base, a cover, an operation mechanism, at least three kinds of asymmetrical single-pole switches and a release mechanism. The cover is mounted on the base to form a space, where the mechanisms and the switches are disposed. The operation mechanism is connected to one switch; the release mechanism to the at least three switches. Each switch comprises a strong side and a weak side. For each switch, there is a thick contact housing on the strong side connected to a thick shaft, and a thin one on the weak side connected to a thin shaft. A rotor component has a single contact spring mounted on the weak side. Rotation shafts are connected by a linkage shaft to connect the single-pole switches; a strong side of one switch is connected to a weak side of another switch.