An automatic transfer switch, commonly called an ATS, automatically detects a power outage and transfers electrical loads to the generator without homeowner intervention.. The following wiring diagram shows a portable generator is wired to the 120V/240V main panel using manual transfer switch. Generally, you may connect a 30 amp transfer switch (like Protran or Reliance) for up to 7500 watts generator while other sizes (such as 50 amps) are also available for residential applications.
The process can be fully automated using a relay switch, connecting the generator's line wires to the NC and common terminals and those from the main supply to the main terminals for normal operation. I'll show you in more detail below with illustrations of how to wire a generator transfer switch to a circuit that controls an essential load.. Automatic Generator Transfer Switch: This instructable is to create and attach a generator transfer switch to a house. The whole point of this is safety and lazy.