The soft starter of air-conditioning TL-ASSU220P3 is an embedded air-conditioning controller.It regulates the start-up voltage and current of the compressor intelligently by utilizing advanced micro-control technology of SCM,and effectively reduces the instantaneous current and power of the compressor while starting-up,thus protects the compressor and prolongs its life.Simultaneously,it also depresses the shock while air-conditioning starting up in the power supply network. The most important feature of our product is it can control the highest launching transient current of air conditioner to be about 2 times as great as its rated current.never exceed 3 times.It can effectively protect air conditioner compressor, extend its service time. Additionally, when it detects the compressor couldn't start because of the imbalance of pressure,it will protect the compressor, then restart after 90 seconds.So then effectively prevents the compressor from overburning for failure start. Main technical parameters Highest continuous working voltage: 250VAC. Highest continuous working current: 18A. Highest non-repetitive inrush current: 400A(300 M ohms. The tolerant pressure between the chassis and the shell: >3000 V/AC in 1 minute. Ambient temperature: -40 to 85 C. Relative Humidity: 0~95% RH(