A spark quencher (SPQ) is a network which consists of capacitor and resistor in a series circuit. Both elements are designed to withstand the high energy surges which are present in various application.
Spark Quenchers are used in electrical applications to suppress back EMF generated in Inductive load and also used in Protection of Solid state Switches. Spark Quenchers can be installed across the load or across the output contacts switching the load. It reduces the occurrence of arcing and noise generation in relay and Switch contacts.