名词
中文翻译：初级刻度开关
同义词：
['primary scale switch', 'primary scale breaker', 'primary scale tripper']
例句：
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1. The primary scale breaker is responsible for detecting and preventing fires in the factory.
初级刻度开关负责检测和预防工厂内的火灾。
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2. The primary scale breaker was designed to ensure safe operation of the machine.
初级刻度开关被设计来确保机器的安全运行。
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3. The technician had to replace the primary scale breaker after a sudden power failure.
技术人员在突然停电后不得不更换初级刻度开关。