Contactor can be easily retro-fitting auxiliary contact group, and appropriate combination of thermal relay to protect the load that may have been circuits.
接触器还可方便地加装辅助触头组，和适当的热继电器组合，保护可能发生过负载的电路之用。
2
First, you should always protect against your machine — the one serving your Web content to millions of users — from being used as a mail relay.
首先，应当始终防止您的机器(为数百万个用户提供Web内容的机器)成为一个邮件中转站。
3
How to promote the right action rate of the Relayprotect equipment is the most important and difficult problem of the power dispatch and communication system.