[Three-wire input and output] - High-performance timer switch, three-wire input and output, which helps to solve the problem that some customers cannot wire the neutral wire, the maximum power reaches 4KW, so there is no need to connect a contactor. [Wide application] - This programmable timer relay is widely used in three-phase 350V-420V AC motors and other equipment such as water pumps, water oxygenation fish pond, rice steamer, water heater, display board, neon lamp, fan. [Weekly relay] - Easily set the ON/OFF time, with a total of 17 on/off settings. From Monday to Sunday, each setting can be set at least one minute intervals, and the maximum duration is 168 hours (1 week), which can be manually turned on and off temporarily. As long as it is set once, it can be switched continuously. [Wide Application] - This programmable timer relay is widely used in three-phase 350V-420V AC motors and other equipment such as water pumps, fish pond oxygenator, rice steam engine, water heater,