In
electronics, an
opto-isolator, also called an
optocoupler,
photocoupler, or
optical isolator, is a component that transfers electrical signals between two isolated circuits by using light. Opto-isolators prevent
high voltages from affecting the system receiving the signal. Commercially available opto-isolators withstand input-to-output voltages up to 10
kV and voltage transients with speeds up to 10 kV/
µs.