The best replacement for rcd is rcbo.

The best alternatives to rcd are rated as following:
★★★★★  rcbo
★★★★★  mcb
★★★★  rccb
★★★★  fabtech
★★★  elcb
★★★  gfci
★★★  circuit breaker
★  gfi
★  surge protector
★  rns
★  safety switch
★  earth leakage
★  isolation transformer
  pro comp

Your alternative for rcd is not listed? Suggest!
Speaking about rcd, one probably shouldn't forget about mcb.

Other search terms related to rcd and their ratings are:
★★★★★ mcb
★★ isolation transformer
★ inverters
★ socket
extension lead
You have in mind a companion for rcd and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of rcd in all years. Click on graph for more.
rcd
rcbo
mcb