Features: High-performance timer switch, three Wire input and output three Wire, helping to solve the problem that some customers are not convenient to wire neutral wire.The maximum power reaches 4kW, avoiding the trouble of connecting the contactor Just set the time of ON/OFF,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 time is 168 hours (equal to 1 week), which can be turned on and off manually temporarily. As long as it is set once, it can be permanently cycled It is widely used in three-phase 350v-420vAC motor and other equipment such as water pump, fish pond oxygenation, rice steaming machine, water heater, billboard, neon lamp, exhaust fan and so on. Can achieve unmanned management, safe and reliable, stable performance, is a very good choice. Built-in rechargeable battery, power off memory. No need to reset the program, convenient and practical. Specification: Control output: 16A (three-phase direct output) Setting times: 17ON/OFF (day/week) Set time: 1 minute to 168 hours Travel time error: 1s/24h Power failure memory: more than 180 days (built-in 1.2v rechargeable battery) Installation size: 120*120*52mm/4.7*4.7*2in Installation method: screw , guide rail (35mm) Weight: Approx.467g/16.5oz Package list: 1 x Programmable Time Relay