Circuit Breaker (CB) reliability is needed to maintain the availability of power transmission system. However, its reliability decreases with time due to ageing process. In order to maintain availability of power system, PLN established a refreshment regulation of high voltage equipment. The refreshment criteria are based on technical, age, and risk consideration. This paper discusses parameters used for technical consideration, as well as failure occurrence and criticality of substation towards the system for risk consideration. The parameters of technical and risk consideration are then applied in a formula to obtain risk criteria which used as priority scale for refreshment program.