Master Relay - Master Solenoid -Master Contactor : all alternate names for the Battery Contactor
These all describe the same device that we can use to quickly disconnect the aircraft battery from the rest of the electrical system.
This device is often confused with the starter contactor or starter solenoid. They are NOT the same! These devices are not interchangeable. A battery contactor and a starter contactor perform a different function in our aircraft.
Our short video explains the differences between these components and describes their internal operation. Then, we show how to wire them in your experimental aircraft.