Description: time period during which all the performance requirements are met; Name: usefull life
Description: Time interval from first use until the instant when a limiting state is reached ; Name: useful life
Description: Value indicated by the manufacturer of the device which arises from measurements which have been found out under fixed conditions and rules for the tension which can be laid out to electrical operating supplies under consideration of the use conditions and on which the different product-specific testings refer; Name: Rated input voltage