D-Series Toggle Switches Carling Technologies D-Series Toggle Switches are single-pole nylon insulated switches with self-cleaning wiping contacts. These switches are suitable for power and low-level switching in applications with restricted back panel space. Carling D-Series Toggle Switches feature ratings up to 20A 125VAC, 10A 250VAC, 1 1/2 HP 125-250VAC. Applications include environmental controls, marine, and food service.