[Three-wire input and output] - High performance timer switch with three-wire input and output, designed to address wiring challenges for users unable to connect a neutral wire. Supports up to 4 kW maximum load, eliminating the need for an external contactor in many applications. [Widely Applicable] - This programmable time relay is suitable for use with 350V–420V AC three-phase motors and various equipment such as water pumps, fish pond aerators, rice steamers, water heaters, display panels, neon lights, and fans. [Weekly Timer Function] - Set ON/OFF times with up to 17 programmable cycles per week. Individual settings can be scheduled from Monday to Sunday with intervals as short as one minute. Maximum timer duration is 168 hours (7 days). Supports temporary manual override for immediate on/off control. Once programmed, the schedule runs continuously in cycle mode. [Built-in Memory Backup] - Equipped with a built-in rechargeable battery to retain settings during power interruptions. No need to reprogram after power loss. [Easy Installation and Use] - Simply set the desired timing after connecting the power cable. Compatible with standard 380V AC systems. Features: 1. High-performance, stable three-phase timer switch with three-wire input and output. Supports up to 4 kW load without requiring a neutral wire, reducing installation complexity. 2. Ideal for a wide range of industrial and commercial applications including water pumps, aerators, heating systems, signage, lighting, and ventilation fans operating within 350V–420V AC. 3. Built-in rechargeable battery maintains time and program settings during power outages for uninterrupted operation. 4. Direct setup and operation—program once and run automatically on a repeating weekly schedule. Specifications: Model: DDS528 Rated Voltage: 230V AC Rated Current: 5–32A Load Capacity: 0.05Ib – Imax (direct connection type) or 0.02Ib – Imax (transformer connection type) Display: LCD Backlight: None Power Indicator: Green LED Energy Pulse Indicator: Red LED (flashes approximately 80ms when signal is present) Mounting: 35mm DIN rail Operating Environment: -25°C to 55°C, up to 95% RH Dimensions: 78.5 x 36.5 mm (3.09 x 1.44 inches) Package Weight: Approximately 131g (4.6 oz) Package Contents: 1 x Timer Relay 1 x Mounting Clip 4 x Sealing Plugs Note: 1. Due to differences in monitor displays and lighting conditions, actual product color may vary slightly from images. 2. Please allow slight variations due to manual measurement.