The SIMATIC S7 automation system complies with various different regulations and standards. You can read and if necessary, download the currently available certificates and approvals on the Service & Support pages in the Internet at:
In Product Support, you select the desired product group, e.g. S7-300/S7-300F.
There, you select the Entry list tab and in the Entry type drop-down list you select Certificates.
Using the filters you can narrow down the selection to specific certificates, e.g. UL.
If you select a single product (Product View), you select the Entries tab; otherwise the procedure is identical.