240 Volt

A transfer switch is a device designed to transfer electrical loads between multiple power sources, such as Utility Power, Generator or Inverter power. 

During a power outage, it is utilized to connect electrical loads to a backup power source, typically a generator or inverter, this can be done through either a manual transfer switch or an automatic transfer switch.

However most Inverter/Chargers have this switch built in, but in my case I needed a seperate switch between Utility Power (Shore Power) and Inverter Power (Cruising Power).