High timer switch with three-wire input and three-wire output, designed to accommodate customers who find it inconvenient to connect a neutral wire. Simply set the ON/OFF timing with a total of 17 ON/OFF configurations. From Monday to Sunday, each setting can be set at least one minute apart with a maximum duration of 168 hours (equivalent to one week), and it allows for temporary manual operation. It is extensively used in three-phase motor systems operating at 350v-420vac and other equipment, including water pumps, fish pond aerators, rice steamers, water heaters, billboards, neon lights, exhaust fans, and more. This device enables unattended management and is safe, reliable, and stable; an excellent choice overall. Featuring a built-in rechargeable battery, it offers power-off memory, eliminating the need to reset the program for convenience and practicality. Specification: Voltage: 380 V / 50-60 Hz Control output: 16 A (three-phase direct output) Setting times: 17 ON/OFF (day/week) Set time: from 1 minute to 168 hours Error in travel time: 1s / 24h Power outage memory: over 180 days (built-in 1.2v rechargeable battery) Installation size: 120 * 120 * 52mm / 4.7 * 4.7 * 2in Installation method: screw, guide (35mm) Weight: approx. 467 g / 16.5 oz