以下为句子列表：
英文: In order to increase the occupating coefficient and reliability of digital experimental box,we improve its power supply by designing a simple,reliable overcurrent protecting circuit base on the analysis of its working principle .
中文: 设计了一个简单可靠的电源过流保护电路，分析了过流保护电路的工作原理，在此基础上改进了数字电路实验箱中稳压电源电路，提高了仪器的使用效率，增强了可靠性.
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英文: Main breakers provide overcurrent protection and a single disconnect point for all power in a switchboard or device.
中文: 主开关能够提供过电流保护，是配电盘或设备的电源断开点。
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