刚刚看到是没有保险的，见下面的说明

Risk

You could lose money by investing in the fund. Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

https://fundresearch.fidelity.com/mutual-funds/summary/31617H102