Correct. Also known as an ELB (earth leakage breaker), or a GFCI if you are American (ground fault circuit interrupter). In North American homes they are generally installed at the socket. Which is kinda nice.
Another thing to consider, if you ever redo an install (or part of it), is to use RCBOs (residual current breaker with overcurrent). They fit into a normal DIN slot, so take no extra space in the DC. Then you have individual overcurrent protection for each circuit, and you don’t lose the whole house over one bad appliance.
The downside: Very costly. Imagine paying R500+ for every breaker and doing a house with 10 or more circuits. It’s like 5k before you’ve done a stitch of work 