No , strong anti-interference and high reliability. Quality chip, stable performance. Adopt --precision chip, never empty the standard capacity. It is widely used in petrochemical equipment, pharmaceutical food machinery, packaging machinery, textile machinery, plastic machinery, CNC machine tools and other automatic control fields. [Product Name]: Three-phase motor soft start module [Output current]: DC controlled AC. [Control mode]: DC controlled AC. [Control voltage]: 3.5-32 [Ambient temperature]:-30-70 [Load voltage]:380VAC [Installation method]: Bolt fixation [Usage]: Soft start of water pump, fan, airplane, common motor, replacing soft start of frequency converter instead of star soft start, etc., with super simple wiring and powerful functions without bypass contactor. Note: due to the different production batches, the printed silk screen words are different, which does not affect the use. Color:As Shown Material:Plastic + Metal Package Contents: 1 * -30WA-R1 (3KW) three-phase motor soft start module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.