Digital Transfer Switch Controller is ideal for open-transition automatic transfer switch control for emergency stand-by applications with a single generator. The Digital Transfer Switch Controller performs an open-transition re-transfer when utility power is restored, allowing the engine to cool down before stopping. The Digital Transfer Switch Controller is facilitated with internal breaker interlock utilizing discrete inputs for breaker position detection. Digital Transfer Switch Controller can be utilized in 1 phase 2W, 1 phase 3W, 3 phase 3W and 3 phase 4W systems.