Abstract:
A high performance circuit breaker wherein an electric current flows through the first (22) and second (32) contact carrying support. The terminal (24) is crossed by electric current (I1) in a set orientation, whereas the arms (28) are crossed by electric current (I2) having a substantially opposed orientation in an essentially parallel direction, with respect to current (h). The interaction between the currents (I1 2) generate a repulsive electromagnetic force F which is able to distance the arms from the terminal, creating additional contact pressure between the contacts. Even though the second contact carrying support is crossed by electric current (b) having a substantially opposed orientation in an essentially parallel direction with respect to current (I2), generation of a further electromagnetic force, which would tend to separate the arms from the second contact carrying support, unwanted electromagnetic repulsion between the contacts is avoided by the first (50) and second (70) ferromagnetic shield.
Abstract:
A multipole current limiting circuit breaker comprising an insulating enclosure that contains: a) for each pole, at least one fixed contact and at least one movable contact, which can be mutually coupled/uncoupled upon closure/opening of the circuit breaker; b) actuation means which provide the energy for moving said movable contacts and determines their coupling/uncoupling with the corresponding fixed contacts, said actuation means comprising a rotating actuation bar that is operatively coupled to the movable contacts of the poles; characterized in that said movable contacts have a fork-shaped body having a base element that supports two arms provided with plates for electrical contact with corresponding coupling surfaces of the fixed contact, and in that said fork-like body is connected to the actuation bar by virtue of elastic means accommodated at least partially in a seat formed in the bar, said elastic means being anchored to said bar and being fixed to said base element so as to support the movable contact and facilitate a substantially uniform distribution of the pressure applied by the contact plates to said corresponding coupling surfaces of the fixed contact.
Abstract:
A circuit breaker (10) including a sliding connection between a trip unit (12) and associated contact arm (20) is disclosed herein. The sliding connection facilitates assembly of the circuit breaker (10) and also permits a reduction of size for a circuit breaker of a given rating. An embodiment of the sliding connection includes a blade (30) and jaw assembly (52) connected between the trip unit (12) and contact arm (20). Another embodiment of the sliding connection includes a blade or jaw assembly slidably connected directly to the contact arm.
Abstract:
A miniature circuit breaker is provided which is adapted to improve automatic assembly of all components. Key components of the breaker are individually and collectively designed to be susceptible to total Z-axis assembly. In particular, the circuit breaker operating mechanism which operates the contacts (45, 46) to make or break the electric circuit is formed of elements designed to interact in a Z-axis assemblable fashion. The movable contact (45) is defined on a contact carrier or blade assembly (41) which is adapted for Z-axis assembly and also provides increased arc erosion resistance and improved opening of the breaker contacts.
Abstract:
The present disclosure discloses an electrical contactor system, including: a stationary contactor (310; 320) having a stationary contact (311; 321); a moving contactor (400) having a moving contact (411; 421); and a rotating member (100), on which the moving contactor (400) is mounted and is rotatable between a connected position and a disconnected position along with the rotating member (100), when the moving contactor (400) is rotated to the connected position, the moving contact (411; 421) is in electrical contact with the stationary contact (311; 321), when the moving contactor (400) is rotated to the disconnected position, the moving contact (411; 421) is separated from the stationary contact (311; 321). The electrical contactor system further includes a magnetic blow-out arc quenching device (610, 710; 620, 720) including a permanent magnet (610; 620), wherein the permanent magnet (610; 620) is statically disposed in the vicinity of the stationary contactor (310; 320) for elongating an arc between the stationary contact (311; 321) and the moving contact (411; 421) by electromagnetic force so as to extinguish the arc; and an isolation arc quenching device (210; 220) adapted to push the arc toward the permanent magnet (610; 620) so as to force the arc to move to the vicinity of the permanent magnet (610; 620), thereby improving an effect of magnetic blow-out arc quenching.
Abstract:
An electric contact which comprises an Ag alloy having a chemical composition wherein Sn and In contents are both 1 to 9 mass %, has a first layer as a surface layer and a second layer as an inner part, wherein the first and second layers exhibit hardness values of 190 or greater and 130 or less, respectively, as measured according to the micro-Vickers standard provided in JIS and the first layer has a thickness in the range of 10 to 360 mum. The electric contact is advantageous especially in that it combines excellent fusion resistance characteristics and excellent temperature characteristics.
Abstract:
A single-pole miniature circuit breaker, comprising:-- a casing on which there are two terminals for connection, in input and in output from the circuit breaker, to a phase of a low-voltage electric circuit, said casing having a front wall from which an actuation lever protrudes, a rear wall for coupling to a supporting element, two side walls that are substantially mutually parallel and whose distance is equal to a base module M, an upper wall and a lower wall, inside the casing there being provided:--fixed and moving contact means that can be mutually separated in order to interrupt the flow of current in said phase;-- a kinematic mechanism that is operatively connected to said actuation lever and is suitable to move said moving contact means;--electric are quenching means;--a device for protection against short-circuits, which comprises a coil and a moving striker suitable to interact operatively with said kinematic mechanism;-- a device for protection against overloads, which comprises a heat-sensitive element that is suitable to interact operatively with the kinematic mechanism; characterized in that said fixed and moving contact means comprise a first pair of contacts, having a first fixed contact and a first moving contact, and a second pair of contacts, having a second fixed contact and a second moving contact, a first arc quenching chamber and a second arc quenching chamber being respectively associated with said first and second pairs of contacts, said first and second pairs of contacts being electrically series-connected to each other and being crossed by currents that have the same direction.
Abstract:
A mobile switching device (7) for a low-voltage power switch (1). Said device presents a contact lever support (11) accommodating several contact levers (10). The contact lever support (11) comprises a base body (26) and additional parts (28) which can be added to it, along with swing-out mounting supporting arms (17) for connection and disconnection. By combining the base body (26) and additional parts (28,30) it is possible to produce contact lever supports with various overall widths for adjustment to a desired rated current.