The best replacement for isolator is solenoid.

The best alternatives to isolator are rated as following:
★★★★★  solenoid
★★★★★  relay
★★★★  mcb
★★★★  circuit breaker
★★★  circulator
★★  combiner
★★  zener barrier
★★  insulator
★★  isolation transformer
★  separator
★  rabs
  mccb
  battery switch
  damper
  barrier
  diode isolator
  integrator

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isolator
solenoid
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