Through the utilisation of light waves, photocouplers prevent high voltages on one side of circuits from damaging components or distorting transmissions on the other side of circuits. Rapid’s range of Kingbright, Isocom and Vishay photocouplers and optoisolators include transistor optoisolators, AC input Darlington output photocouplers, AC Input photocouplers, sub-miniature photoreflective sensors and triac driver optoisolators.