[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 4kW, thus avoiding connecting the contactor.[Widely Application] - This programmable time delay relay is widely used in 350v-420vAC three-phase motors and other equipment such as water pump, water oxygenation, etc. fish pond, rice steamer, water heater, display board, neon light, 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.[Widely Application] - This programmable time delay relay is widely used in 350v-420vAC three-phase motors and other equipment such as water pump , fish pond oxygenation, rice steamer, water heater, display board, neon light, fan on.[Three-wire input and output] - Timer switch at high performance, 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.