You will find that the protection relay responds fast, helping prevent damage during overcurrent and voltage spikes.
MunHean IDMTL REF 052 Overcurrent & Earth Fault Relay MH REF052
A nice touch is the smooth terminal access on the Clipsal L5512RVF when making connections.
Because it says RELAY AND CONTROL, I can pair it with older units without worrying about mismatched parts.
The FTR-F3 model shows sensible contact gaps that help reduce chatter in everyday use.