| 摘要 |
<p>A start circuit (1) of the invention comprises a series connection of a glow switch (10) and a safety switch (12). The glow switch (10) and the safety switch (12) are each provided with an enclosed space (10a, 12a), with a pair of current conductors (10b, 10c resp. 12b, 12c) which enter the enclosed space and with a bimetallic element (10e resp. 12e) which is arranged in the enclosed space and which is connected with one (10c resp. 12c) of the current supply connectors. The enclosed space (10a) of the glow switch (10) is provided with an ionisable filling. The glow switch (10) is opened in cold state. The safety switch is closed in cold state. The start circuit (1) comprises a heat source (11) for opening the safety switch (12). The start circuit further comprises a heat source for keeping the safety switch (12) opened. The start circuit (1) of the invention is characterised in that the heat source for keeping the safety switch (12) opened is formed by an ionisable filling in the enclosed space (12a) of the safety switch (12).</p> |
