CT3451V1 4mm Safety Banana Jacks Cal Test Electronics CT3451V1 4mm Safety Banana Jacks (socket) accept sheathed or shrouded banana plugs and meet international safety standards. Component recognition per UL 61010-1 and CAN/CSA C22.2 No. 61010-1 to 1kV CAT III, 25A. These sockets are mounted with 4 terminals into a PCB pad. Cal Test Electronics CT3451V1 series is designed for vertical printed circuit mounting from the rear of the panel.