A high voltage circuit breaker (400, 500, 600, 700, 700A, 700B) comprising: a vacuum interrupter module comprising a vacuum interrupter housing and at least two electrical contacts (14A, 14B) in the vacuum interrupter housing, where at least one of the two electrical contacts (14A, 14B) is movable relative to the other, allowing the two electrical contacts (14A, 14B) to engage and disengage one from another for switching on and off a high voltage; a drive module (260, 360) comprising a drive module housing (262, 362) and an electrically insulating drive member (264, 364), at least a part (264B, 364B) of the electrically insulating drive member (264, 364) being contained in the drive module housing (262, 362) insulating said part (264B, 364B) from ambient air, said electrically insulating drive member (264, 364) being coupled with the at least one movable contact; and an actuator coupled to the electrically insulating drive member (264, 364) for providing a relative movement of said at least two electrical contacts (14A, 14B), wherein the drive member is an electrically insulating rod, wherein said drive module housing (262, 362) is filled with a dielectric material (266, 366) or contains a vacuum such that at least a part (264B, 364B) of the drive member is immersed into this dielectric material (266, 366) or is surrounded by said vacuum, and wherein the high voltage circuit breaker (400, 500, 600, 700, 700A, 700B) further comprises an encapsulation for the vacuum interrupter module and the drive module (60, 160), the encapsulation having an insulating layer, a conductive layer, and at least two apertures (26A, 26B, 26C, 26E, 26D) to allow electrical connection to the at least two electrical contacts (14A, 14B) from the outside. a vacuum interrupter module comprising a vacuum interrupter housing and at least two electrical contacts (14A, 14B) in the vacuum interrupter housing, where at least one of the two electrical contacts (14A, 14B) is movable relative to the other, allowing the two electrical contacts (14A, 14B) to engage and disengage one from another for switching on and off a high voltage; a drive module (260, 360) comprising a drive module housing (262, 362) and an electrically insulating drive member (264, 364), at least a part (264B, 364B) of the electrically insulating drive member (264, 364) being contained in the drive module housing (262, 362) insulating said part (264B, 364B) from ambient air, said electrically insulating drive member (264, 364) being coupled with the at least one movable contact; and an actuator coupled to the electrically insulating drive member (264, 364) for providing a relative movement of said at least two electrical contacts (14A, 14B), wherein the drive member is an electrically insulating rod, wherein said drive module housing (262, 362) is filled with a dielectric material (266, 366) or contains a vacuum such that at least a part (264B, 364B) of the drive member is immersed into this dielectric material (266, 366) or is surrounded by said vacuum, and wherein the high voltage circuit breaker (400, 500, 600, 700, 700A, 700B) further comprises an encapsulation for the vacuum interrupter module and the drive module (60, 160), the encapsulation having an insulating layer, a conductive layer, and at least two apertures (26A, 26B, 26C, 26E, 26D) to allow electrical connection to the at least two electrical contacts (14A, 14B) from the outside.