Abstract: A high voltage electric power switch with an anti-flashover nozzle that suppresses the likelihood of a flashover occurring between switch components other than the switch contactors, such as the nozzle casing around the first contactor (e.g., female or socket) and the casing around the second contactor (e.g., male or pin) during an opening stroke of the contactors. The anti-flashover features include a corona ring positioned at the proximal end of the nozzle casing and a nozzle clamp ring positioned to the distal side of a nozzle casing abutment that mates with a nozzle receiver. The conventional nozzle includes a nib-shaped proximal end of the nozzle casing carrying a clamp ring positioned on the proximal side of the abutment. The new nozzle design reduces the high level of electric field stress created by the conventional nozzle casing to suppress the likelihood of a flashover occurring between the contactor casings.