What is "switched neutral"?
General appliance wiring looks like this:

This is &quot;switched Live&quot; and is the preferred way to do it because once you switch it off, the appliance is not connected to high voltage. It's safe for servicing without risk of a shock.
In case you put the switch on the neutral line instead of live, that case becomes &quot;switched neutral&quot; as shown below:

In this case, you need to be extra careful while servicing the appliance. Even if the switch is turned off, the appliance will get a high voltage and there is a risk of electrical shock. Make sure you turn the live MCB off before servicing to avoid a shock.