All electrical and electronic equipment. The SVS range uses relays. In a lot of makes this can. However, the Sollatek SVS uses the unique Zero-Volt Switching technique which ensures that no noise is generated and no interruption of the supply takes place. This criteria should not be the reason for choosing a stabiliser.
Mechanical stabilisers suffer from many disadvantages.
The Faxguard connection is very simple. Follow the diagram below. This is male RJ45 at both ends. Plug this loose end now into the FAX OUT connection. And then Plug the mains plug of the Fax into the Faxguard.