ELECTRICAL DEVICE

摘要

An electrical device (1) in which a first resistive element (7) which is composed of a first electrically non-linear composition is in electrical contact, and preferably in physical and electrical contact, with a second resistive element (13) which is composed of a second composition which has a resistivity of less than 100 ohm-cm. The first composition has a resistivity of more than 109 ohm-cm and contains a first particulate filler (11). The second composition contains a second particulate filler (19) which (a) is magnetic and electrically conductive, and (b) is aligned in discrete regions (17) in the second polymeric component (15). The device also contains first and second electrodes (3, 5) which are positioned so that current can flow between the electrodes through the first and second resistive elements. Devices of the invention have relatively low breakdown voltages and can survive high energy fault conditions.