I bought the following switch which I would like to control the AC power (230V 50Hz) to an AC/DC converter with. This switch only permits one terminal to connect/disconnect, meaning I could control whether or not the Live wire is connected to the converter or not. But I cannot control if the Neutral wire is connected/not connected.
Is it safe/functional to keep the Earth and Neutral terminals connected from the power supply to the AC/DC converted while switching on and off the Live wire? Attached is a diagram illustrating this. 
I ask since the previous designer used a double throw switch, meaning the Neutral and Live wire were connected/disconnected at the same time. Whereas now I'm connecting/disconnecting just the Live wire and I'm not sure if that is rational.
Thanks for your input!
Best Answer
Yes. Not only is this safe, but it's the standard.
Switching neutral is dangerous: if the live side of the switch fails closed, parts of the device may be energized to line voltage while the device is switched off. If the device is plugged into other powered devices, it may even end up powering itself through the other device's ground.