摘要:
A switch having a molded article of which the entirety or a part is composed of an organic and inorganic complex composition is provided, wherein the base inside of the base of a box is composed of for example an organic and inorganic complex composition with the resin content at 15 to 70 wt % and the content of one or more inorganic compounds capable of dehydration at 150° C. or more at 80 to 30 wt %.
摘要:
A polyester resin composition comprising 21-29% by weight of a resin component consisting of fumaric acid neopentyl glycol propylene glycol type polyester and cumene hydroperoxide as a hardening agent; 52-60% by weight of one or more kinds of inorganic compounds which undergo dehydration reaction at a temperature not later than 150.degree. C. as an inorganic filler; and 15-23% by weight of a reinforcing material. The composition of the present invention when used for an insulation component member of a switch, improves the insulation property after the cut-off of a large electric current. More specifically, the composition of the present invention can prevent the formation of the resin skin layer on the surface of the molded product, so that the inorganic compound which can be decomposed by the heat from the electric arc to produce a gas which changes the free carbon and metal vapor to nonconductive oxides can be present in the surface layer of the molded product and the insulation property can be secured even after the cut-off of the electric current.
摘要:
A switch comprising a switch case, contacts adapted to be opened and closed, an arc extinguishing chamber disposed in the vicinity of the contacts, and an arc extinguishing material capable of reducing the amount of metal particles and free carbons to be scattered from components disposed within the switch by an arc generated when the contacts are opened or closed or capable of insulating the metal particles and the free carbons to convert into an insulator, thereby inhibiting a decrease in arc resistance expected to occur upon the generation and extinction of the arc and a decrease in insulation resistance expected to occur within and around the arc extinguishing chamber and at inner wall surfaces of the switch case upon and after the extinction of the arc. The switch according to the present invention is applicable to a switch expected to generate an arc upon interruption of electric current flowing therethrough such as a circuit breaker, current-limiting device or electromagnetic contactor and is capable of immediately extinguishing the arc and inhibiting the decrease in insulation resistance within and around the arc extinguishing chamber and at inner wall surfaces of the switch case.
摘要:
The invention relates to a circuit breaker having a crossbar (7) that is supported swingably onto a base (1B) to hold swingably movable contacts (4), and has the small reduction of overtravel in the elapsed years, and can reduce its size. The bending modulus of elasticity Eb, Ec of the base (1B) and the crossbar (7) at the ordinary temperature/ordinary humidity satisfy following relationships Eb+Ec≧17000 MPa (1) 8000 MPa≦Eb (2) 9000 MPa≦Ec (3).
摘要:
An organic and inorganic complex composition wherein the resin is at 15-70 wt % and the content of one or more inorganic compounds capable of dehydration at 150° C. or more is at 80-30 wt %. When the composition is exposed to combustion, inorganic compounds being capable of dehydration at 150° C. or more and being contained in the organic and inorganic complex composition generate steam which then suppresses combustion. Simultaneously, endothermic reaction during steam generation deprives combustion heat. A switch having a molded article of which the entirety or a part is composed of an organic and inorganic complex composition is provided, wherein the base inside of the base of a box is composed of for example an organic and inorganic complex composition with the resin content at 15-70 wt % and the content of one or more inorganic compounds capable of dehydration at 150° C. or more at 80-30 wt %.
摘要:
A switch containing a switch case, contacts adapted to be opened and closed, an arc extinguishing chamber disposed in the vicinity of the contacts, and an arc extinguishing material capable of reducing the amount of metal particles and free carbons to be scattered from components disposed within the switch by an arc generated when the contacts are opened or closed or capable of insulating the metal particles and the free carbons to convert into an insulator, thereby inhibiting a decrease in arc resistance expected to occur upon the generation and extinction of the arc and a decrease in insulation resistance expected to occur within and around the arc extinguishing chamber and at inner wall surfaces of the switch case upon and after the extinction of the arc. The switch is applicable to a switch expected to generate an arc upon interruption of electric current flowing therethrough such as a circuit breaker, current-limiting device or electromagnetic contactor and is capable of immediately extinguishing the arc and inhibiting the decrease in insulation resistance within and around the arc extinguishing chamber and at inner wall surfaces of the switch case.
摘要:
A current limiting device includes first and second contact members, each contact member having, at a first end, contacts defining a contact pair; a contacting pressure is applied to said contact pair; and a cylindrical insulator cylindrically surrounding the contacts when the contacts are closed. The device is arranged such that at least one of the first and second contact members is rotatably supported at a second end. Also, an electrical path is defined through which currents flow in substantial opposition to the first and second contact members and in opposite directions to each other. The first ends of the first and second contact members are positioned within the space defined by the cylindrical insulator in the closed contact state. The contact of at least one of the rotatably supported contact members is positioned outside of the space defined by the cylindrical insulator when the contacts are open.
摘要:
A switch includes a moving element having a traveling contact at one end thereof, and a repelling element having a repelling contact at one end thereof and extending substantially parallel to the moving element, and the repelling contact capable of making and breaking contact with the traveling contact, and the switch further comprising a conductor connecting the repelling element to the side of a power source system, and the conductor including a first conductor portion positioned within the limits of the traveling contact and said repelling contact when said moving element and the repelling element are opened so as to be connected to the side of the power source system, and a second conductor portion connecting the first conductor portion to the repelling element at an end on the side opposed to the repelling contact.
摘要:
A switch includes a fixed contact having a first conductor portion connected to a terminal, a second conductor portion having a stationary contact, and a third conductor portion. The third conductor portion is disposed on the side of the other end of a moving contact to which a traveling contact is not mounted with respect to a position of the stationary contact, and on the side opposed to the terminal. The first conductor portion is disposed above a contact surface of contacts at a contact closing time, and is disposed below a contact surface of the traveling contact at a contact opening time. A position of the first conductor portion which can be surveyed from a surface of the traveling contact at an opening time of the contacts is coated with an insulator. Thereby, it is possible to provide an excellent current-limiting performance since an entire current path of the fixed contact generates electromagnetic force to stretch an arc on the side of the terminal, and since the arc is cooled by vapor generated from the insulator.