ABB 2CSM204245R0601 weekly electro-mechanical time switch without running reserve, 3 modules. The AT3-7R System pro M compact time switch control circuit opening and closing according to the scheduled program. It can be set on the scheduled program or on the permanent ON function (ON-OFF only for three modules versions). It is equipped with a built-in battery, generally charged by the network voltage, which allows the devices to maintain the set time also in case of long (up to 200h) power supply failures. The products fit applications such as shop lighting systems, public buildings, schools, heating and irrigation systems and so forth.