For this exact wiring, please connect as the picture below.


Red = Live
Black = Neutral
Green = Earth. No need to use for a double-insulated item
Red will always have power, you'll need to turn OFF the Miniature Circuit Breaker in the DB. This is since the doorbell doesn't have a switch to turn OFF power. You can check if Red is power with a test pen. You can check if Red and Black is as I said by temporary connecting a small 240 V lamp to Red+Black, and turning on the MCB. The lamp should light.

Q - What are the Blue wires then? In the doorbell switch the wires are red+black.
A - The normal way of doing things in Malaysia is to run armoured cable to the gate post for the doorbell switch. Then half-way the electrician will change to the normal electrical cable. That joint is usually behind the socket where the gate open/close switch is. You see, they run multiple core armoured cable to the gate post for the gate, the doorbell, the post light, etc. If you check, the blue wires won't have power. Both are blue, and connected together, because the doorbell switch does not have power, it is just contacts to ring the doorbell.

Follow these instructions at your own risk. Please get a qualified person to check if you are in any way unsure.