High performance timer switch, three-wire, three-wire input and output, which helps solve the problem that some customers are unwilling to wire the neutral wire. The maximum power reaches 4 kW, which avoids contactor connection problems. Simply set the on/off time, with a total of 17 on/off settings.From Monday to Sunday, each parameter can be set at least one minute apart and the maximum duration is 168 hours (equal to 1 week), which can be manually turned on and off temporarily As long as it is set once, it can be cycled continuously Programmable time response is widely used in 380v three-phase motors and other equipment such as water pump, fish pond oxygenation, rice steam machine, heater-water, billboard, neon lamp, exhaust fan, etc. This timer response can achieve unmanned management, safe and reliable performance, stable performance, is a very good choice.Built-in rechargeable battery, turn off the memory.