A gas-insulated high or medium voltage circuit breaker comprising: a pin contact and a second contact being configured to be moveable with respect to each other along a longitudinal axis of the circuit breaker between an open and a closed configuration of the circuit breaker, the pin contact and the second contact defining an arcing region in which an electrical discharge is formed during a current breaking operation; and an auxiliary nozzle comprising an electrically insulating material, that at least partially surrounds the second contact, a main nozzle comprising an electrically insulating material, that encloses the auxiliary nozzle at least partially, and a heating channel provided between the auxiliary nozzle and the main nozzle, wherein the heating channel separates the auxiliary nozzle from the main nozzle axially and radially and enables a fluid communication between the arcing zone and an upstream pressure volume, wherein at least one conductive element is embedded within the insulating material of the main nozzle and is electrically floating, the at least one conductive element is arranged around the arcing region and is configured to generate an electrical field due to the presence of an electrical discharge in the arcing region, the electrical field being configured for deflecting the electrical discharge which propagates from the pin contact along an inner surface of the main nozzle towards the second contact, and the conductive element is located adjacent to the heating channel entrance on a side of the heating channel entrance towards the pin contact, characterized in that the conductive element is substantially annularly shaped, in particular may be a continuous ring, or may be segmented ring or ring structure with segments located along a circumferential path and is having a recess directed to the inner surface of the main nozzle. a pin contact and a second contact being configured to be moveable with respect to each other along a longitudinal axis of the circuit breaker between an open and a closed configuration of the circuit breaker, the pin contact and the second contact defining an arcing region in which an electrical discharge is formed during a current breaking operation; and an auxiliary nozzle comprising an electrically insulating material, that at least partially surrounds the second contact, a main nozzle comprising an electrically insulating material, that encloses the auxiliary nozzle at least partially, and a heating channel provided between the auxiliary nozzle and the main nozzle, wherein the heating channel separates the auxiliary nozzle from the main nozzle axially and radially and enables a fluid communication between the arcing zone and an upstream pressure volume, wherein at least one conductive element is embedded within the insulating material of the main nozzle and is electrically floating, the at least one conductive element is arranged around the arcing region and is configured to generate an electrical field due to the presence of an electrical discharge in the arcing region, the electrical field being configured for deflecting the electrical discharge which propagates from the pin contact along an inner surface of the main nozzle towards the second contact, and the conductive element is located adjacent to the heating channel entrance on a side of the heating channel entrance towards the pin contact, characterized in that the conductive element is substantially annularly shaped, in particular may be a continuous ring, or may be segmented ring or ring structure with segments located along a circumferential path and is having a recess directed to the inner surface of the main nozzle.