You can get devices which fit into a standard circuit breaker slot which perform both functions in the UK such a device is called an "RCBO" aka "Residual Curre

You can get devices which fit into a standard circuit breaker slot which perform both functions in the UK such a device is called an "RCBO" aka "Residual Current Breaker with Over-Current (protection)" good summary here from schneider https://eshop.se.com/in/blog/post/what-is-the-difference-between-mcb-mccb-rcb-rcd-rccb-and-rcbo.html https://eshop.se.com/in/blog/post/what-is-the-difference-bet...