| 摘要 |
An alternating current relay, especially for the railroad signalling system, comprising a direct current relay and a rectifying system connected to it in series, consisting in that the rectifying system comprises a triac (7), and in the triac's main circuit fed with alternating current, a direct current relay (6) is included, and a Zener diode (8) is included in triac (7) gate circuit, whereas the triac gate circuit is connected with the controlled alternating current circuit.<IMAGE>
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