最基本的PDU是一个大型电源板没有过载保护。
The most basic PDU is a large power strip without surge protection.
对于没有过载保护的力转换器，极限力和操作力是一样的。
For force transducers without built-in overload protection, the limiting force and operating force are identical.
设有过载保护、断绳保护、工作高度保护等多重安全保护装置。
Safety device include: overload protection, wirerope break protection, height limit protection.
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