介绍了风机、水泵类负载起动时间大于15秒以上时，采用热继电器保护的方法，及控制线路在风机上应用的效果。
The article introduces detailedly the methods which are used to protect the hot relays when the fans and pumps loaded starting time is over 15 seconds.
介绍了风机、水泵类负载起动时间大于15秒以上时，采用热继电器保护的方法，及控制线路在风机上应用的效果。
The article introduces detailedly the methods which are used to protect the hot relays when the fans and pumps loaded starting time is over 15 seconds.
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