The Shelly Pro 3EM switch add-on is a galvanicallyisolated switch designed to expand the capabilities of the Shelly Pro 3EMdevice. Easily control electrical devices with greater flexibility and controlover your consumption. Features: Dry contacts DIN-Rail mountable Benefits: Load shedding – Keep track of how much energy your solarpanels and wind turbines are generating and save effortlessly by controllingyour consumption with the Shelly Pro 3EM Switch Add-on.