A 16A air switch is sufficient for a 60v electric car. The air temperature around the normal use conditions of the air switch is not less than -5 degrees, not higher than 40 degrees, and the daily average is not more than 35 degrees. Installation site elevation does not exceed 2000 meters. Atmospheric relative humidity, at the highest temperature of 40 degrees does not exceed 50%, at lower temperatures can have higher humidity, such as the wettest monthly average temperature does not exceed 25 degrees, the monthly average relative temperature does not exceed 90%, and allows the temperature change sent on the surface of the product condensation