Contactum
20A 10KA Type A  - C Curve 
1 Mod AFDD/ERCBO
The AFDR10 has an LED fault status indicator that operates 
a flashing sequence blink code following the reclosing of the device after tripping
No preventative maintenance of the device is required apart from the period pressing of the Test button in-line with standard RCD procedure. 
The AFDD device will perform internal self-tests periodically in-line with BSEN 62606 device standards.
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