Item number:HKA1-42 Our HKA1 series with the self-rest fuction and self-lock fuction,the feature is :Metal head high quality We had apply the patent of item HKA1-41,Patent number:200530156098.1 Rated voltage:150/250/600V Rated current:15/10/4A Mechanical life time:50,000times Electrical life time:50,000times Application: 1.Apply temperature range:-25℃/45℃ 2.Height above sea level can not more than 1000m 3.Relative humidity of air no more than 85% 4.Amplitude less than 0.5mm,Frequency less than 600times/Min 5.In dielectric without burst danger,metal can’t be rusted by dielectric,gas broke the insulation and electric conduct dust.