An RCBO is a Residual Current Breaker with Overcurrent protection. In simple terms, it combines the function of an MCB and an RCD in a single device. That means it protects against two things:

Split load boards are on the way out. If you're still fitting them, this video could change everything. In this video, we break down the exact reasons why BS 7671 is pushing the industry towards RCBO-only protection