Safety Standard of Machinery, Equipment and Tools Article 63

The circular saw shall have a device to fix its shaft to prevent the hazard from shaft rotating when replacing the blade.
中文原文 機械設備器具安全標準第63條
圓盤鋸應設置可固定圓鋸軸之裝置,以防止更換圓鋸片時,因圓鋸軸之旋轉引起之危害。

English translation for reference only; the Chinese text prevails. Not legal advice.