The RCD DUO is connected to the earth circuit, which however is not required to be earthed, so the need for earth staking generators is a thing of the past.
Generally, at 40 volts (the potential point to electrocute) the device will trip at 10mA. This can be altered to meet the application at the point of assembly.
Unlike many other devices on the market the RCD DUO has no relays or coils with moving parts and therefore is not subject to vibrations caused by generators and transportation.