초록 ▼

An electrical switch arrangement, comprising a first mechanical switch, a second mechanical switch and a PTC device, with (a) the PTC device and second switch connected in parallel and the parallel combination connected in series with the first switch, or (b) the PTC device and first switch connecte

An electrical switch arrangement, comprising a first mechanical switch, a second mechanical switch and a PTC device, with (a) the PTC device and second switch connected in parallel and the parallel combination connected in series with the first switch, or (b) the PTC device and first switch connected in series and the series combination connected in parallel with the second switch. The arrangement can interrupt a current and voltage higher than the rated currents and voltages of each of the switches and the PTC devices. The parallel switch can be rated to interrupt the rated interrupt current of the electrical switch arrangement at a voltage below the rated voltage of the electrical switch arrangement, and the series switch can be rated to interrupt a current below the rated interrupt current of the electrical switch arrangement at the rated voltage of the electrical switch arrangement.

대표청구항 ▼

[ What is claimed is:] [1.] An electrical switch arrangement which comprises(1) a first mechanical switch,(2) a second mechanical switch, and(3) a PTC device; h(a) the PTC device and second switch connected in parallel and the parallel combination connected in series with the first switch, or(b) the

[ What is claimed is:] [1.] An electrical switch arrangement which comprises(1) a first mechanical switch,(2) a second mechanical switch, and(3) a PTC device; h(a) the PTC device and second switch connected in parallel and the parallel combination connected in series with the first switch, or(b) the PTC device and first switch connected in series and the series combination connected in parallel with the second switch; arrangement, when rated by a defined procedure in which both switches are operated simultaneously to interrupt a current at a voltage V.sub.SWITCH, having a rated current I.sub.SWITCH ;at least one of(A) the first switch, when rated on its own by the same procedure at the voltage V.sub.SWITCH, having a rated current I.sub.FIRST which is at most j times I.sub.SWITCH, where j is 0.8, and(B) the second switch, when rated on its own by the same procedure at a voltage V.sub.SECOND which is at most k times V.sub.SWITCH, where k is 0.8, having a rated current I.sub.SECOND which is at most I.sub.SWlTCH ; and the PTC device, when tested on its own in a test circuit whose open circuit voltage across the terminals to which the PTC device is connected, were the PTC device to be removed from the test circuit; would be V.sub.SWITCH, requiring a current, I.sub.PTC, through it of no more than m times I.sub.SWITCH, where m is 0.1, to cause its resistance to increase by a factor of at least 100, in a resistance increase time of at most 16 milliseconds.