| 摘要 |
915,130. Fusible cut-outs. MASCHINENFABRIK OERLIKON. Aug. 13, 1959 [Aug. 25, 1958], No. 27754/59. Class 38 (1). In a high-speed fusible cut-out, a spring-loaded insulating wedge-member 4 is arranged to impinge on the fuse element 1 when a fault occurs, the resulting reduction in the crosssection of the element causing a rapid rise in the temperature thereof and consequently quicker rupturing than would occur solely by the fault current. The wedgemember is held set by a holding magnet 7 excited by a coil 10 and is released when the current through a demagnetizing winding 8 in series with the element 1 sufficiently weakens the flux through the magnet 7. The arc resulting from the rupture of the element may be extinguished by a blow-out coil 14, horns 13 and an arc-chute 15. A permanent magnet may be used as the holding magnet and demagnetization may be effected by condenser discharge. In addition, replacement of the fuse may be carried out automatically. |
