Finder 9902 series indicator emc suppression modules finder 9902023098 this finder 9902 series emc suppression and indicator module contains a varistor suppression circuit and a green led indicator the varistor circuit protects relay drivers from negative going voltage spikes the led shows when the associated relays coil is energized the module is designed to fit into a compatible socket together with the relay it protects compatible with finder relays from the 40 44 46 55 56