AFDD + RCBO combined:
AFDDs will all have automatic test, RCCB included + test button, includes overcurrent and fault current protection.

What buildings will be compulsory.: final socket circuits not exceeding 32A
Higher Risk Residential Buildings (HRRB): over 18M high or 6 stories what ever comes 1st
Houses in Multiple Occupation (HMO)
Purpose built student accommodation
Care homes

A combined Arc Fault Detection Device and RCBO. This combination within a single module is effective at detecting electrical arcing faults within cable, wiring accessories, and appliances that could cause an electrical fire. This is in addition to earth leakage and overload. Bi-directional, Double Pole (switched Neutral) as standard.

AFDDs detect electrical arc faults that an MCB, RCBO or RCD are unable to detect, such as serial arching faults, parallel arcing between conductors and parallel arcing between live and protective conductor (Earth). These devices are suitable for use on circuits, radial circuits and will also offer protection to spurs and leads.

These single module AFDDs with integral RCBO function are available in B curve with 30mA trip sensitivity and fit into the BG range of consumer units and enclosures and can be easily retrofitted into existing installations.