| 摘要 |
The power supply for spark-proof control circuits in contactors, fitted with a breaker, an auxiliary transformer, a main contactor, an over-current relay with a short-circuit and thermal unit, a leak-proof relay, an earthing control lock relay, consisting in that to the secondary winding of the auxiliary transformer (1), the following components are connected in series: a circuit with an auxiliary NC contact (2) of the breaker (16), an NO contact (3) of the leak-proof relay (17), an NO contact (4) of earthing leak-proof relay (18), a NC contact (6) of the short-circuit element of the over-current relay (19) and NO contact (6) of the thermal element of that over-current relay (19), the parallel circuit of the NO contact (7) of the forcing relay(13) and the auxiliary NO contact (8) of the main contactor (20), the transformer (9) of the spark-proof control circuit (10), whereas after the NC contact (2) of the breaker (16), a circuit is connected with in-series auxiliary NO contacts (11) for the right position of the breaker drive, or with in-series NO contacts (12) for the left position of the breaker drive, and the coil of the forcing relay (13), and after the NO contact (6) of the thermal element of the over-current relay (19), the coil of the first separating relay (14) is connected, whereas after the parallel system of the contact ....<IMAGE>
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