名词
中文翻译：保护继电器
同义词：
['protective relay', 'protective device', 'protection device']
例句：
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1.The protection relay is designed to protect the system from overloads.
保护继电器旨在保护系统免受过载。
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2. The safety of the workers is ensured by the use of this protection relay.
工人的安全通过使用这种保护继电器得到保障。
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3. The protection relay was installed to prevent electrical fires in the factory.
保护继电器的安装是为了防止工厂内电气火灾的发生。