This is a varistor manufactured by Surging. Varistors are used to protect against sudden changes in voltage. This particular varistor has a 10D561KJ rating, a 925V surge voltage rating, 0.4W power rating, 180pF @ 1 kHz capacitance rating, 460V AC or DC rating, 70J rating, 350V AC or DC rating, 560V AC or DC rating, 2.5kA impulse rating, and a radial leaded, P=7.5mm package. It is RoHS compliant.