The best replacement for relay is contactor.

The best alternatives to relay are rated as following:
★★★★★  contactor
★★★★  transistor
★★★★  atm
★★★  solenoid
★★★  fuse
★★★  switch
★★  mpls
★  relate
★  vpn
★  convey
★  relay
★  triac
★  solid state relay
★  plc
★  remote
★  fet
★  x.25
  mosfet
  leased line
  ip vpn
  t1
  mechanical relay
  optocoupler
  breaker
  x 25
  diode
  isolator
  smarthost
  circuit breaker
  point to point
  ppp
  isdn
  servo
  starter
  contact

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

Other search terms related to relay and their ratings are:
★★★★★ diode
★★★ timer
★★ resistor
★★ arduino
★ transistor
subinterfaces
time delay
optocoupler
You have in mind a companion for relay and it is not yet here? Propose!



Google Trends

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relay
contactor
transistor