- 40, field relay
- 励磁继电器。当机组的励磁电流发生故障时，或低于给定值时动作，或当一台交流电机的电枢无功电流过大，而又显示异常低的磁场激磁时动作。
English-Chinese electricity dictionary (电气专业词典). 2013.
40, field relay
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