| 摘要 |
<p>An electrical resistance or heater (2) comprising an electrical resistive track (8) provided on an insulating substrate (6). Two predetermined sections (10, 12) of the track (8) have a predetermined current carrying capacity and are bridged by a glass, ceramic or glass ceramic material (17). The configuration of the track (8) and the glass material (17) are chosen such that at a predetermined temperature, the leakage current between the track sections (10, 12) rises to the extent that it causes a current to flow through one or both of the sections (10, 12) which is substantially above its current carrying capability, whereby one section (10, 12) fails.</p> |
