The cooling fan in the protection can be divided into RP AS SS CL four ways be explained separately below:

RP is the abbreviation of Rev erse Protection , and the positive and negative poles are reversely connected to protect (with polarity protection diode) to prevent the positive and negative poles from being connected and burning the fan. 

AS is the abbreviation of Auto Re_Start , rotor lock protection, automatic restart function

SS is the abbreviation of Soft Start , soft start, the current and speed rise slowly

CL is the abbreviation of Current Limit , current limit protection

The above are the four protection methods in the cooling fan !

The above information comes from Dongguan Yinhai Electronics Co., Ltd. ( www.yinhaidg.com ), an enterprise focusing on fan R&D and production . Please indicate the source for reprinting!