The KAQY210 series  is robust, ideal for  telecom and ground  fault  applications.  It  is  a  SPST normally  open switch (1 Form A) that replaces electromechanical relays in  many  applications.  It  is  constructed  using  a  GaAlAs LED for actuation control and an integrated monolithic die for  the  switch  output.  The  die  is  fabricated  in  a high-voltage  dielectrically  isolated  technology  and  is comprised of a photodiode array, switch control circuitry and MOSFET switches.