The Shelly EM 120 A current transformer terminal has an integrated relay output for contactor control. You can manage the Shelly EM output via the Shelly app, MQTT or the Rest API. It offers automatic switch-off or notification when the current consumption limit is reached as well as automatic switch-on and switch-off after the hour or sunset and sunrise. Current transformer terminal 120 A for Shelly 3 EM. Not suitable for Shelly Pro 3EM as a different plug is used