多晶硅期货主力合约跌破50000大关，涨幅收窄至不足4%，此前一度涨停。

Core Viewpoint - The main contract for polysilicon futures has fallen below the 50,000 mark, with the increase narrowing to less than 4%, after previously hitting the limit up [1] Group 1 - The polysilicon futures market experienced a significant drop, indicating potential volatility in pricing [1] - The price fluctuation suggests a shift in market sentiment, which could impact the overall solar energy industry [1] - The previous limit-up situation indicates strong market interest prior to the recent decline [1]