[Three-wire input and output] - High performance timer switch, three-wire input and output, helping to solve the problem that some customers are unable to wire the neutral wire.The maximum power reaches 4 kW, thus avoiding connecting the contactor. [Widely Application] - This programmable time relay is widely used in 380vAC three-phase motors and other equipment such as water pump, fish pond oxygenation, rice steam machine, water heater, billboard, floor lampneon, fan on. [Weekly Relay] - Simply set the ON/OFF time, with a total of 17 On/Off settings.From Monday to Sunday, any setting can be set at least one minute apart 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 cycled continuously. High-performance stable three-phase timer switch, three-line fire-proof input, three-line fire-proof output, eliminates the inconvenience of some customers who inconvenience the connection of the zero line without the zero line, the maximum power reaching 4 kW the contactor. Widely used in water pump, fish pond aerator, rice bowl, water heater, billboard, neon light, exhaust fan and other 380VAC three phase motor and othersequipment A very good choice.