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.