If the neutral line accidental touched the live wire, then due to momentary surge the home appliances connected gets damaged, what are the ways to protect the devices. Would RCCB be helpful to protect the home appliances. Initially I thought the devices are burnt due to high voltage hence installed servo stabilizer but even that got affected.
In many smart homes with sensitive electronics and appliances, I have installed a surge protector at the electrical panel. They do not take up much room. It protects against accidental surges in the 120-240 volts entering the home from such things as lightning strikes.
Circuit breakers or fuses will provide protection from short circuits; shorts quickly develop very high currents and quickly trip breakers or melt fuses.
An RCCB will not do anything extra to stop a line to neutral short. The RCCB trips when it senses a ground fault when it detects a current imbalance between the line and neutral. With a line to neutral short, there is high current but no imbalance.