1A2R switch is a RF and PTT router, which routes one amplifier between two radios.
Using a switch on the device, you can toggle the amp between two radios using the first one wins principle.
Once you connect it, you will not need to rewire the setup and your amp is routed premanently. Just use the MODE to toggle between the radios.
In the case of failure while running SO2R, you can switch the amplifier from radio B to radio A as a backup.
Isolation between ports:
Maximum power rating:
>70dB at 30MHz in worst case
3000W with SWR 1:1
The diagram below shows how you can share an amplifier between two radios.