An RCBO is a combination of an MCB and RCD
This enables both overcurrent protection and earth fault current protection by a single unit.

Single module Sentry RCBOs may be installed anywhere along the length of the busbar and will occupy one outgoing way.

RCD's - Residual Current Device Offers added Protection against Electric Shock

An RCD provides protection against earth faults occurring in equipment and reduces the
effects of electric shock on human beings.