First, use  
Overvotagle absorber primarily for the frequency of 50Hz or 60Hz AC Power vacuum absorption system for vacuum circuit breaker and contactor and come with the operating voltage.  
Second, the use of the environment  
Installation and operation of the local environment : air -40~+40 ¡ã C temperature range.   Installation and operation of not more than 1000m above sea level.   Field installation should be non-corrosive gases and steam, conductive or explosive dust without severe vibration.