How to Protect Electrical Circuit from Reverse Power

use diodes

very common pratise we are using in DG connection i.e reverse power relay..you may consider this also if the circuit is sensative and heavy

rgds

gst

Try some diodes in the circuit

If you are talking about an automatic transfer switch the sources are separated, there is no potential for reverse power.

Use Mechanical AND Electrical Inetrlocked Switching Devices.

its better to use reverse power relay if the circuit you consider is of heavy importance.