The start potentiometer is the start bit 200v when it is set halfway. The soft start potentiometer has a maximum duration of 30 seconds corresponding to the full 380v. compatible example: all adjusted to the minimum time: starting voltage 0V, soft start 0 seconds (not recommended 0 seconds) Power supply 220v, fully adjusted to half, the start 55v, soft start time of about 22 seconds Power supply 380v, fully adjusted to half, the beginning of 95v, soft start time of about 22 seconds Power supply 220v, fully adjusted to the maximum, the beginning of 110v to 220v, soft start time of about 15 seconds Power supply 380v, fully adjusted to the maximum, the beginning of 190v to 380v, soft start time of 15 seconds General recommendation compatible selection margin: SSR-60WA-R compatible 2.2kw. This product is commonly used compatible motors with the following voltages: 220V ... (50Hz, 60Hz). 230V ... (50Hz, 60Hz). 240V ... (50Hz, 60Hz). The above three voltages are universal compatible this product. Single-phase 220V soft start module use range: Petroleum, chemical, fire, construction, metallurgy, building materials, mining, environmental protection and other fields. Fans, pumps, belt conveyors, ball mills, car washing machines, conveyors and compressors. It is an ideal replacement compatible traditional star/delta conversion, auto-coupling buck, magnetic control buck, inverter and other step-down starting devices. 220V single-phase motor soft start module (motor conversion method) model: SSR-20WA-R1 (1kw) SSR-40WA-R1 (1.5kw) SSR-60WA-R1 (2kw) SSR-100WA-R1 (4kw) SSR-150WA-R1 (6kw) SSR-200WA-R1 (8kw) According to the actual working current 5 times: power ÷ voltage × 5 in case: Your motor is 8000w power ÷ 220v voltage × 5 = (181.81WA should choose 200WA) should choose the parameter closest to that model. our soft start is universal compatible the motor, regardless of whether the motor has a capacitor or not. If your motor is working compatible a long time, the motor above 2000W needs to be equipped with a heat sink. Single phase motor compared to starter module Voltage compatibility: (220V + 0V = single-phase 220V, AC) (230V + 0V = single-phase 230V, AC) (240V + 0V = single-phase 240V, AC) (220V + 220V = two-phase 380V--400V, AC) Frequency: 50Hz, 60Hz Soft start time is adjustable between 0-30 seconds (soft start time refers to the entire process 0-220V, 0-380V) Slowly adjust the starting voltage from 0-50? Reaching the rated voltage (220-380V) There are two ways to use it: 1. After closing the switch, the main power will be energized and start soft start. 2. Use the switch to control, close the soft start to start, open to stop. The soft start module has 2 programs: 1.SSR-40WA-R1 has soft start and no soft stop. 2.SSR-40WA-R2 has soft start and soft stop functions (start as many V stops as V stop) note: 1.Do not apply voltage to the switch. note: 1. Do not use a multimeter on the load side to judge the quality of the product! 2. Subject to field test. Working environment temperature range -25°C~60°C