1.Powerful motor controller supports that no need to connect bypass contactor, which can be economical and practical. 2.Fit for soft start of water pump, fan, vehicle and ordinary single-phase motor, such motor start module keeps super simple wiring. 3.Made of materials in high quality, motor start board can be easy to use in the practical life, which makes itself getting great popularity. 4.Single-phase motor start module supports the ability to replace adjustable auto-transformer, inverter soft start, etc. 5.No extral step is required when you use such motor start board to controll and the operation is simple. Item Type: Motor start board_x000D_ Type: Module / Module + Radiator (optional)_x000D_ Model: SSR-100WA-R(4KW)(with soft start without soft stop)_x000D_ Voltage Compatibility: Single-phase 220VAC, 2-phase 380VAC, Frequency: 50-60Hz_x000D_ Soft Start Time : Adjustable from 0-30 seconds (the soft start time refers to the whole process of 0-220V, 0-380V)_x000D_ Starting VoltageAdjustable from 0-50% to the rated voltage (220-380V)_x000D_ Two Ways to Use:_x000D_ 1. When the switch is closed, the main power supply is energized and the soft start begins._x000D_ 2. Use the switch to control, start by closing the soft start, open the stop_x000D_ When the starting potentiometer is adjusted to half, the starting is 200V,_x000D_ The maximum time of the soft start potentiometer is 30 seconds, which corresponds to the full range of 380V._x000D_ For Example: When Completely Adjusted to Minimum: Initial voltage 0V soft start 0 seconds (0 seconds is not recommended)_x000D_ Power Supply 220V: When completely adjusted to half, the initial 55V, soft start time is about 22 seconds_x000D_ Power Supply 380V: When completely adjusted to half, the initial 95V, soft start time is about 22 seconds_x000D_ Power Supply 220V: When completely adjusted to the maximum, the initial voltage of 110V to 220V takes 15 seconds_x000D_ Power Supply 380V: When completely adjusted to the maximum, the initial voltage 190V to 380V takes 15 seconds_x000D_ Size1 : Approx. 92mm / 3.6in_x000D_ Approx. 74mm / 2.9in_x000D_ Approx. 47mm / 1.9in_x000D_ Approx. 104mm / 4.1in_x000D_ Approx. 35mm / 1.4in_x000D_ Approx. 43mm / 1.7in_x000D_ Size 2: Approx. 125mm / 4.9in_x000D_ Approx. 80mm / 3.1in_x000D_ Approx. 110mm / 4.3in_x000D_ Approx. 28mm / 1.1in_x000D_ Approx. 100mm / 3.9in 1 x Module