That’s an RCD, not a breaker. Guess the English still insist on using nonstandard terminology, like “lift”, “bonnet”, “torch”, and, apparently, “breaker”. Oh well.
This is not an RCD, it's an RCBO. It combines the functions of an MCB (Miniature Circuit Breaker) and an RCD (Residual Current Device) in one device, as specified by BS EN 61009 (Residual Current Operated Circuit Breakers with Integral Overcurrent Protection).